__________________________________________________________
	
						   The U.S. Department of Energy
					   Computer Incident Advisory Capability
							   ___  __ __    _     ___
							  /       |     /_\   /
							  \___  __|__  /   \  \___
				 __________________________________________________________
	
								 INFORMATION BULLETIN
	
					 Information Leakage Using IPv6 Routing Header
					  [Cisco Security Advisory Document ID: 97848]
	
	August 15, 2007 15:00 GMT                                         Number R-325
	______________________________________________________________________________
	PROBLEM:       Cisco IOS and Cisco IOS XR contain a vulnerability when 
				   processing specially crafted IPv6 packets with a Type 0 Routing 
				   Header present. 
	PLATFORM:      Cisco IOS 
				   Cisco IOS XR 
	DAMAGE:        Exploitation of this vulnerability can lead to information 
				   leakage on affected IOS and IOS XR devices, and may also result 
				   in a crash of the affected IOS device. 
	SOLUTION:      Upgrade to the appropriate version. 
	______________________________________________________________________________
	VULNERABILITY  The risk is MEDIUM. Remote DoS. 
	ASSESSMENT:                                                                   
	______________________________________________________________________________
	LINKS: 
	 CIAC BULLETIN:      http://www.ciac.org/ciac/bulletins/r-325.shtml 
	 ORIGINAL BULLETIN:  http://www.cisco.com/en/US/products/products_security_
								  advisory09186a0080899647.shtml 
	______________________________________________________________________________
	[***** Start Cisco Security Advisory Document ID: 97848 *****]
	
	Cisco Security Advisory: Information Leakage Using IPv6 Routing Header in Cisco 
	IOS and Cisco IOS-XR 
	 
	 Document ID: 97848 
	 
	 
	Advisory ID: cisco-sa-20070808-IOS-IPv6-leak
	http://www.cisco.com/warp/public/707/cisco-sa-20070808-IOS-IPv6-leak.shtml 
	Revision 1.1
	Last Updated 2007 August 09 1800 UTC (GMT)
	For Public Release 2007 August 08 1600 UTC (GMT)
	
	--------------------------------------------------------------------------------
	--------------------------------------------------------------------------------
	
	Contents
	Summary 
	Affected Products 
	Details 
	Impact 
	Software Versions and Fixes 
	Workarounds 
	Obtaining Fixed Software 
	Exploitation and Public Announcements 
	Status of This Notice: FINAL 
	Distribution 
	Revision History 
	Cisco Security Procedures 
	
	
	--------------------------------------------------------------------------------
	
	Summary 
	Cisco IOS and Cisco IOS XR contain a vulnerability when processing specially 
	crafted IPv6 packets with a Type 0 Routing Header present. Exploitation of this 
	vulnerability can lead to information leakage on affected IOS and IOS XR devices, 
	and may also result in a crash of the affected IOS device. Successful exploitation 
	on an affected device running Cisco IOS XR will not result in a crash of the 
	device itself, but may result in a crash of the IPv6 subsystem. 
	
	Cisco has made free software available to address this vulnerability for affected 
	customers. There are workarounds available to mitigate the effects of the 
	vulnerability. 
	
	This advisory is posted at http://www.cisco.com/warp/public/707/cisco-sa-20070808-
	IOS-IPv6-leak.shtml. 
	
	Note: The August 08, 2007 publication includes four Security Advisories and one 
	Security Response. The advisories all affect IOS, one additionally affects Cisco 
	Unified Communications Manager as well. Each advisory lists the releases that 
	correct the vulnerability described in the advisory, and the advisories also 
	detail the releases that correct the vulnerabilities in all four advisories. 
	Individual publication links are listed below:
	
	Cisco IOS Information Leakage Using IPv6 Routing Header
	http://www.cisco.com/warp/public/707/cisco-sa-20070808-IOS-IPv6-leak.shtml 
	
	Cisco IOS Next Hop Resolution Protocol Vulnerability
	http://www.cisco.com/warp/public/707/cisco-sa-20070808-nhrp.shtml 
	
	Cisco IOS Secure Copy Authorization Bypass Vulnerability
	http://www.cisco.com/warp/public/707/cisco-sa-20070808-scp.shtml 
	
	Voice Vulnerabilities in Cisco IOS and Cisco Unified Communications Manager
	http://www.cisco.com/warp/public/707/cisco-sa-20070808-IOS-voice.shtml 
	
	Cisco Unified MeetingPlace XSS Vulnerability
	http://www.cisco.com/warp/public/707/cisco-sr-20070808-mp.shtml 
	
	Affected Products 
	Vulnerable Products 
	This vulnerability affects devices that are configured to use the IPv6 protocol 
	and are running affected versions of one of the following types of software: 
	
	Cisco IOS
	
	Cisco IOS XR
	
	To determine the software running on a Cisco IOS product, log in to the device 
	and issue the show version command to display the system banner. Cisco IOS 
	software will identify itself as "Internetwork Operating System Software" or 
	simply "IOS." On the next line of output, the image name will be displayed 
	between parentheses, followed by "Version" and the Cisco IOS release name. 
	Other Cisco devices will not have the show version command, or will give 
	different output. 
	
	The following example shows output from a device running an IOS image: 
	
	Router>show version
	Cisco IOS Software, 7200 Software (C7200-IK9S-M), Version 12.3(14)T1, RELEASE 
	SOFTWARE (fc1)
	Technical Support: http://www.cisco.com/techsupport
	Copyright (c) 1986-2005 by Cisco Systems, Inc.
	Compiled Thu 31-Mar-05 08:04 by yiyanAdditional information about Cisco IOS 
	release naming is available at the following link: 
	http://www.cisco.com/en/US/products/sw/iosswrel/ps1828/products_white_
	paper09186a008018305e.shtml. 
	
	To determine whether IPv6 is configured on an IOS device, look for the lines 
	containing ipv6 in the Cisco IOS configuration, as shown in the following 
	example: 
	
	Router#show running-config | include ipv6
	ipv6 address 2001:0DB8:C18:1::/64 eui-64If the configuration contains a line 
	or lines similar to the above example, IPv6 is configured on the device. The 
	exact IPv6 address will vary in your configuration. 
	
	To determine whether IPv6 is configured on an IOS XR device, look for the 
	following lines in in the Cisco IOS XR configuration: 
	
	Router-IOS_XR#show ipv6 interface | include IPv6
	IPv6 is enabled, link-local address is fe80::216:47ff:fee1:d987 
	IPv6 is disabled, link-local address unassigned
	IPv6 is disabled, link-local address unassignedIf the output contains at 
	least one line that reads IPv6 is enabled, IPv6 is configured on the device. 
	
	Products Confirmed Not Vulnerable 
	No other Cisco products are currently known to be affected by this 
	vulnerability. In particular, the following devices are known not to be 
	affected: 
	
	Cisco PIX and ASA Appliances
	
	Cisco Firewall Services Module (FWSM)
	
	Cisco MDS
	
	Cisco PIX, ASA, and FWSM firewall products do not process packets containing 
	IPv6 Routing headers. All such packets will be silently dropped. 
	
	Details 
	Successful exploitation of the vulnerability described in this document may 
	result in swapping memory between the destination IPv6 address in the IPv6 
	packet header and 16 bytes from the packet buffer memory. Memory that can 
	be accessed through this vulnerability can not be further than 1500 bytes 
	from the packet header start. 
	
	This vulnerability is documented for Cisco IOS as Cisco Bug ID CSCef77013 
	( registered customers only) and for Cisco IOS XR as Cisco Bug ID CSCsi74127 
	( registered customers only) . 
	
	Vulnerability Scoring Details 
	Cisco is providing scores for the vulnerabilities in this advisory based on 
	the Common Vulnerability Scoring System (CVSS). The CVSS scoring in this 
	Security Advisory is done in accordance with CVSS version 1.0. 
	
	Cisco will provide a base and temporal score. Customers can then compute 
	environmental scores to assist in determining the impact of the vulnerability 
	in individual networks. 
	
	Cisco PSIRT will set the bias in all cases to normal. Customers are encouraged 
	to apply the bias parameter when determining the environmental impact of a 
	particular vulnerability. 
	
	CVSS is a standards based scoring method that conveys vulnerability severity 
	and helps determine urgency and priority of response. 
	
	Cisco has provided an FAQ to answer additional questions regarding CVSS at 
	http://www.cisco.com/web/about/security/intelligence/cvss-qandas.html. 
	
	Cisco has also provided a CVSS calculator to help compute the environmental 
	impact for individual networks at 
	http://intellishield.cisco.com/security/alertmanager/cvss. 
	
	CSCef77013 - Tighter parameter checking for IPv6 ( registered customers only) 
	
	Calculate the environmental score of CSCef77013  
	 
	CVSS Base Score - 8 
	 
	Access Vector 
	 Access Complexity 
	 Authentication 
	 Confidentiality Impact 
	 Integrity Impact 
	 Availability Impact 
	 Impact Bias 
	 
	Remote 
	 Low 
	 Not Required 
	 Partial 
	 Partial 
	 Complete 
	 Normal 
	 
	Temporal Score - 6.6 
	 
	Exploitability 
	 Remediation Level 
	 Report Confidence 
	 
	Functional 
	 Official Fix 
	 Confirmed 
	 
	
	CSCsi74127 - Processing of IPv6 headers ( registered customers only) 
	
	Calculate the environmental score of CSCsi74127  
	 
	CVSS Base Score - 7 
	 
	Access Vector 
	 Access Complexity 
	 Authentication 
	 Confidentiality Impact 
	 Integrity Impact 
	 Availability Impact 
	 Impact Bias 
	 
	Remote 
	 Low 
	 Not Required 
	 Partial 
	 Partial 
	 Partial 
	 Normal 
	 
	Temporal Score - 5.8 
	 
	Exploitability 
	 Remediation Level 
	 Report Confidence 
	 
	Functional 
	 Official Fix 
	 Confirmed 
	 
	
	
	
	Impact 
	Successful exploitation of this vulnerability may result in the swapping 
	of memory between the destination IPv6 address field and packet buffer 
	memory. This can lead to the leakage of data from the buffer memory in 
	the form of an IPv6 destination address and, in a worst case scenario 
	for devices running Cisco IOS, a complete crash of the IOS device. 
	
	Note: Given that the destination IPv6 address will contain the contents 
	of a buffer memory, the packet may not get routed outside of the local 
	network. Depending on the exact destination address the packet may get 
	dropped by the next router or on the targeted router itself if it does 
	not have route to the newly formed IPv6 address. 
	
	In the case of Cisco IOS XR, successful exploitation will not crash the 
	whole device but only lead to a restart of the IPv6 subsystem. Successful 
	repeated exploitation of this vulnerability may lead to a sustained denial 
	of service (DoS) of all upper layer services that use IPv6 as the 
	transport protocol but not the whole device. 
	
	Software Versions and Fixes 
	When considering software upgrades, also consult 
	http://www.cisco.com/go/psirt and any subsequent advisories to determine 
	exposure and a complete upgrade solution.
	
	In all cases, customers should exercise caution to be certain the devices 
	to be upgraded contain sufficient memory and that current hardware and 
	software configurations will continue to be supported properly by the new 
	release. If the information is not clear, contact the Cisco Technical 
	Assistance Center ("TAC") or your contracted maintenance provider for 
	assistance.
	
	Each row of the Cisco IOS software table (below) names a Cisco IOS release 
	train. If a given release train is vulnerable, then the earliest possible 
	releases that contain the fix (along with the anticipated date of 
	availability for each, if applicable) are listed in the "First Fixed 
	Release" column of the table. The "Recommended Release" column indicates 
	the releases which have fixes for all the published vulnerabilities at the 
	time of this Advisory. A device running a release in the given train that 
	is earlier than the release in a specific column (less than the First 
	Fixed Release) is known to be vulnerable. Cisco recommends upgrading to a 
	release equal to or later than the release in the "Recommended Releases" 
	column of the table.
	
	For further information about how Cisco IOS is built, numbered and 
	maintained, please see the following URL: 
	http://www.cisco.com/warp/public/620/1.html 
	
	Major Release
	 Availability of Repaired Releases
	 
	Affected 12.0-Based Release 
	 First Fixed Release 
	 Recommended Release 
	 
	12.0
	 Not Vulnerable
	   
	12.0DA
	 Not Vulnerable
	   
	12.0DB
	 Not Vulnerable
	   
	12.0DC
	 Not Vulnerable
	   
	12.0S
	 12.0(32)S8; available 21-Aug-07
	 12.0(32)S8; available 21-Aug-07
	 
	12.0SC
	 Not Vulnerable
	   
	12.0SL
	 Not Vulnerable
	   
	12.0SP
	 Not Vulnerable
	   
	12.0ST
	 Vulnerable; first fixed in 12.0(32)S8 available 21-Aug-07
	 12.0(32)S8; available 21-Aug-07
	 
	12.0SX
	 Vulnerable; first fixed in 12.0(32)S8 available 21-Aug-07
	 12.0(32)S8; available 21-Aug-07
	 
	12.0SY
	 12.0(32)SY4; available 21-Aug-07
	 12.0(32)SY4; available 21-Aug-07
	 
	12.0SZ
	 Vulnerable; first fixed in 12.0(32)S8 available 21-Aug-07
	   
	12.0T
	 Not Vulnerable
	   
	12.0W
	 Not Vulnerable
	   
	12.0WC
	 Not Vulnerable
	   
	12.0WT
	 Not Vulnerable
	   
	12.0XA
	 Not Vulnerable
	   
	12.0XB
	 Not Vulnerable
	   
	12.0XC
	 Not Vulnerable
	   
	12.0XD
	 Not Vulnerable
	   
	12.0XE
	 Not Vulnerable
	   
	12.0XF
	 Not Vulnerable
	   
	12.0XG
	 Not Vulnerable
	   
	12.0XH
	 Not Vulnerable
	   
	12.0XI
	 Not Vulnerable
	   
	12.0XJ
	 Not Vulnerable
	   
	12.0XK
	 Not Vulnerable
	   
	12.0XL
	 Not Vulnerable
	   
	12.0XM
	 Not Vulnerable
	   
	12.0XN
	 Not Vulnerable
	   
	12.0XQ
	 Not Vulnerable
	   
	12.0XR
	 Not Vulnerable
	   
	12.0XS
	 Not Vulnerable
	   
	12.0XV
	 Not Vulnerable
	   
	12.0XW
	 Not Vulnerable
	   
	Affected 12.1-Based Release 
	 First Fixed Release 
	 Recommended Release 
	 
	12.1
	 Not Vulnerable
	   
	12.1AA
	 Not Vulnerable
	   
	12.1AX
	 Not Vulnerable
	   
	12.1AY
	 Not Vulnerable
	   
	12.1AZ
	 Not Vulnerable
	   
	12.1CX
	 Not Vulnerable
	   
	12.1DA
	 Not Vulnerable
	   
	12.1DB
	 Not Vulnerable
	   
	12.1DC
	 Not Vulnerable
	   
	12.1E
	 Not Vulnerable
	   
	12.1EA
	 Not Vulnerable
	   
	12.1EB
	 Not Vulnerable
	   
	12.1EC
	 Not Vulnerable
	   
	12.1EO
	 Not Vulnerable
	   
	12.1EU
	 Not Vulnerable
	   
	12.1EV
	 Not Vulnerable
	
	   
	12.1EW
	 Not Vulnerable
	   
	12.1EX
	 Not Vulnerable
	   
	12.1EY
	 Not Vulnerable
	   
	12.1EZ
	 Not Vulnerable
	   
	12.1GA
	 Not Vulnerable
	   
	12.1GB
	 Not Vulnerable
	   
	12.1T
	 Not Vulnerable
	   
	12.1XA
	 Not Vulnerable
	   
	12.1XB
	 Not Vulnerable
	   
	12.1XC
	 Not Vulnerable
	   
	12.1XD
	 Not Vulnerable
	   
	12.1XE
	 Not Vulnerable
	   
	12.1XF
	 Not Vulnerable
	   
	12.1XG
	 Not Vulnerable
	   
	12.1XH
	 Not Vulnerable
	   
	12.1XI
	 Not Vulnerable
	   
	12.1XJ
	 Not Vulnerable
	   
	12.1XK
	 Not Vulnerable
	   
	12.1XL
	 Not Vulnerable
	   
	12.1XM
	 Not Vulnerable
	   
	12.1XN
	 Not Vulnerable
	   
	12.1XO
	 Not Vulnerable
	   
	12.1XP
	 Not Vulnerable
	   
	12.1XQ
	 Not Vulnerable
	   
	12.1XR
	 Not Vulnerable
	   
	12.1XS
	 Not Vulnerable
	   
	12.1XT
	 Not Vulnerable
	   
	12.1XU
	 Vulnerable; first fixed in 12.3(15) 
	 12.3(23)
	
	12.3(20a)
	
	12.3(21b)
	
	12.3(22a)
	
	12.3(18a)
	
	12.3(19a); available 16-Aug-07
	
	12.3(17c); available 16-Aug-07
	 
	12.1XV
	 Vulnerable; first fixed in 12.3(15) 
	 12.3(23)
	
	12.3(20a)
	
	12.3(21b)
	
	12.3(22a)
	
	12.3(18a)
	
	12.3(19a); available 16-Aug-07
	
	12.3(17c); available 16-Aug-07
	 
	12.1XW
	 Not Vulnerable
	   
	12.1XX
	 Not Vulnerable
	   
	12.1XY
	 Not Vulnerable
	   
	12.1XZ
	 Not Vulnerable
	   
	12.1YA
	 Not Vulnerable
	   
	12.1YB
	 Vulnerable; first fixed in 12.3(15) 
	 12.3(23)
	
	12.3(20a)
	
	12.3(21b)
	
	12.3(22a)
	
	12.3(18a)
	
	12.3(19a); available 16-Aug-07
	
	12.3(17c); available 16-Aug-07
	 
	12.1YC
	 Vulnerable; first fixed in 12.3(15) 
	 12.3(23)
	
	12.3(20a)
	
	12.3(21b)
	
	12.3(22a)
	
	12.3(18a)
	
	12.3(19a); available 16-Aug-07
	
	12.3(17c); available 16-Aug-07
	 
	12.1YD
	 Vulnerable; first fixed in 12.3(15) 
	 12.3(23)
	
	12.3(20a)
	
	12.3(21b)
	
	12.3(22a)
	
	12.3(18a)
	
	12.3(19a); available 16-Aug-07
	
	12.3(17c); available 16-Aug-07
	 
	12.1YE
	 Not Vulnerable
	   
	12.1YF
	 Not Vulnerable
	   
	12.1YG
	 Not Vulnerable
	   
	12.1YH
	 Not Vulnerable
	   
	12.1YI
	 Not Vulnerable
	   
	12.1YJ
	 Not Vulnerable
	   
	Affected 12.2-Based Release 
	 First Fixed Release 
	 Recommended Release 
	 
	12.2
	 Not Vulnerable
	   
	12.2B
	 Vulnerable; first fixed in 12.3(14)T 
	 12.4(12c)
	
	12.4(3h)
	
	12.4(5c)
	
	12.4(8d); available 03-Sep-07
	
	12.4(7f)
	
	12.4(16)
	
	12.4(10c)
	
	12.4(13d)
	 
	12.2BC
	 Vulnerable; first fixed in 12.3(17a)BC 
	 12.3(17b)BC8
	
	12.3(21a)BC3
	 
	12.2BW
	 Vulnerable; first fixed in 12.3(15) 
	 12.3(23)
	
	12.3(20a)
	
	12.3(21b)
	
	12.3(22a)
	
	12.3(18a)
	
	12.3(19a); available 16-Aug-07
	
	12.3(17c); available 16-Aug-07
	 
	12.2BY
	 Vulnerable; first fixed in 12.3(14)T 
	 12.4(12c)
	
	12.4(3h)
	
	12.4(5c)
	
	12.4(8d); available 03-Sep-07
	
	12.4(7f)
	
	12.4(16)
	
	12.4(10c)
	
	12.4(13d)
	 
	12.2BZ
	 Not Vulnerable
	   
	12.2CX
	 Vulnerable; first fixed in 12.3(17a)BC 
	 12.3(17b)BC8
	
	12.3(21a)BC3
	 
	12.2CY
	 Not Vulnerable
	   
	12.2CZ
	 Not Vulnerable
	   
	12.2DA
	 Not Vulnerable
	   
	12.2DD
	 Vulnerable; first fixed in 12.3(14)T 
	 12.4(12c)
	
	12.4(3h)
	
	12.4(5c)
	
	12.4(8d); available 03-Sep-07
	
	12.4(7f)
	
	12.4(16)
	
	12.4(10c)
	
	12.4(13d)
	 
	12.2DX
	 Vulnerable; first fixed in 12.3(14)T 
	 12.4(12c)
	
	12.4(3h)
	
	12.4(5c)
	
	12.4(8d); available 03-Sep-07
	
	12.4(7f)
	
	12.4(16)
	
	12.4(10c)
	
	12.4(13d)
	 
	12.2EU
	 Vulnerable; first fixed in 12.2(25)EWA10 
	 All Cat4K platforms:
	
	12.2(25)EWA10
	
	12.2(31)SGA3
	
	12.2(37)SG1
	
	12.2(40)SG; available Oct-07
	 
	12.2EW
	 Vulnerable; first fixed in 12.2(25)EWA10 
	 All Cat4K platforms:
	
	12.2(25)EWA10
	
	12.2(31)SGA3
	
	12.2(37)SG1
	
	12.2(40)SG; available Oct-07
	 
	12.2EWA
	 12.2(25)EWA10
	 All Cat4K platforms:
	
	12.2(25)EWA10
	
	12.2(31)SGA3
	
	12.2(37)SG1
	
	12.2(40)SG; available Oct-07
	 
	12.2EX
	 Not Vulnerable
	   
	12.2EY
	 Not Vulnerable
	   
	12.2EZ
	 Vulnerable; first fixed in 12.2(25)SEE4 
	 12.2(25)SEE4; available 07-Aug-07
	 
	12.2FX
	 Not Vulnerable
	   
	12.2FY
	 Not Vulnerable
	   
	12.2FZ
	 Vulnerable; first fixed in 12.2(35)SE 
	 12.2(40)SE; available 24-Aug-07
	
	12.2(37)SE1
	
	12.2(35)SE5
	 
	12.2IXA
	 Not Vulnerable
	   
	12.2IXB
	 Not Vulnerable
	   
	12.2IXC
	 Not Vulnerable
	   
	12.2IXD
	 Not Vulnerable
	   
	12.2JA
	 Not Vulnerable
	   
	12.2JK
	 Not Vulnerable
	   
	12.2MB
	 Not Vulnerable
	   
	12.2MC
	 12.2(15)MC2h 
	
	12.2(15)MC2j
	 12.2(15)MC2j
	 
	12.2S
	 12.2(14)S18 
	
	12.2(18)S13 
	
	12.2(20)S14 
	
	12.2(25)S13 
	
	12.2(30)S
	 12.2(25)S13
	
	12.2(14)S19
	 
	12.2SB
	 Not Vulnerable
	   
	12.2SBC
	 Not Vulnerable
	   
	12.2SE
	 Not Vulnerable
	   
	12.2SEA
	 Vulnerable; first fixed in 12.2(25)SEE4 
	 12.2(25)SEE4; available 07-Aug-07
	 
	12.2SEB
	 Vulnerable; first fixed in 12.2(25)SEE4 
	 12.2(25)SEE4; available 07-Aug-07
	 
	12.2SEC
	 Vulnerable; first fixed in 12.2(25)SEE4 
	 12.2(25)SEE4; available 07-Aug-07
	 
	12.2SED
	 Vulnerable; first fixed in 12.2(25)SEE4 
	 12.2(25)SEE4; available 07-Aug-07
	 
	12.2SEE
	 12.2(25)SEE4
	 12.2(25)SEE4
	 
	12.2SEF
	 Not Vulnerable
	   
	12.2SEG
	 12.2(25)SEG3
	 12.2(25)SEG3
	 
	12.2SG
	 12.2(25)SG2; available 13-Aug-07 
	
	12.2(31)SG1 
	
	12.2(31)SG 
	
	12.2(37)SG 
	
	12.2(40)SG; available 24-Oct-07
	 All Cat4K platforms:
	
	12.2(25)SG2
	
	12.2(37)SG1
	
	12.2(31)SG2
	
	12.2(40)SG; available Oct-07
	 
	12.2SGA
	 Not Vulnerable
	   
	12.2SL
	 Not Vulnerable
	   
	12.2SM
	 Not Vulnerable
	   
	12.2SO
	 Not Vulnerable
	   
	12.2SRA
	 Not Vulnerable
	   
	12.2SRB
	 Not Vulnerable
	   
	12.2SU
	 Vulnerable; first fixed in 12.3(14)T 
	 12.4(12c)
	
	12.4(3h)
	
	12.4(5c)
	
	12.4(8d); available 03-Sep-07
	
	12.4(7f)
	
	12.4(16)
	
	12.4(10c)
	
	12.4(13d)
	 
	12.2SV
	 12.2(27)SV2 
	
	12.2(27)SV3 
	
	12.2(27)SV1 
	
	12.2(28)SV1 
	
	12.2(29)SV 
	
	12.2(29a)SV 
	
	12.2(29b)SV
	 12.2(29)SV4; available 14-Oct-07
	 
	12.2SVA
	 Not Vulnerable
	   
	12.2SVC
	 Not Vulnerable
	   
	12.2SW
	 12.2(25)SW11
	 12.2(25)SW11
	 
	12.2SX
	 Vulnerable; first fixed in 12.2(18)SXE 
	   
	12.2SXA
	 Vulnerable; first fixed in 12.2(18)SXE 
	   
	12.2SXB
	 Vulnerable; first fixed in 12.2(18)SXE 
	 12.2(18)SXF10
	 
	12.2SXD
	 Vulnerable; contact TAC 
	   
	12.2SXE
	 Not Vulnerable
	   
	12.2SXF
	 Not Vulnerable
	   
	12.2SXH
	 Not Vulnerable
	   
	12.2SY
	 Vulnerable; first fixed in 12.2(18)SXE 
	   
	12.2SZ
	 Vulnerable; first fixed in 12.2(30)S 
	 12.2(25)S13
	
	12.2(14)S19
	 
	12.2T
	 Vulnerable; first fixed in 12.3(15) 
	 12.3(23)
	
	12.3(20a)
	
	12.3(21b)
	
	12.3(22a)
	
	12.3(18a)
	
	12.3(19a); available 16-Aug-07
	
	12.3(17c); available 16-Aug-07
	 
	12.2TPC
	 12.2(8)TPC10c; available 17-Aug-07
	 12.2(8)TPC10c
	 
	12.2UZ
	 Not Vulnerable
	   
	12.2VZ
	 Not Vulnerable
	   
	12.2XA
	 Vulnerable; first fixed in 12.3(15) 
	 12.3(23)
	
	12.3(20a)
	
	12.3(21b)
	
	12.3(22a)
	
	12.3(18a)
	
	12.3(19a); available 16-Aug-07
	
	12.3(17c); available 16-Aug-07
	 
	12.2XB
	 Vulnerable; first fixed in 12.3(15) 
	 12.3(23)
	
	12.3(20a)
	
	12.3(21b)
	
	12.3(22a)
	
	12.3(18a)
	
	12.3(19a); available 16-Aug-07
	
	12.3(17c); available 16-Aug-07
	 
	12.2XC
	 Vulnerable; first fixed in 12.3(14)T 
	 12.4(12c)
	
	12.4(3h)
	
	12.4(5c)
	
	12.4(8d); available 03-Sep-07
	
	12.4(7f)
	
	12.4(16)
	
	12.4(10c)
	
	12.4(13d)
	 
	12.2XD
	 Vulnerable; first fixed in 12.3(15) 
	 12.3(23)
	
	12.3(20a)
	
	12.3(21b)
	
	12.3(22a)
	
	12.3(18a)
	
	12.3(19a); available 16-Aug-07
	
	12.3(17c); available 16-Aug-07
	 
	12.2XE
	 Not Vulnerable
	   
	12.2XF
	 Vulnerable; first fixed in 12.3(17a)BC 
	 12.3(17b)BC8
	
	12.3(21a)BC3
	 
	12.2XG
	 Vulnerable; first fixed in 12.3(15) 
	 12.3(23)
	
	12.3(20a)
	
	12.3(21b)
	
	12.3(22a)
	
	12.3(18a)
	
	12.3(19a); available 16-Aug-07
	
	12.3(17c); available 16-Aug-07
	 
	12.2XH
	 Vulnerable; first fixed in 12.3(15) 
	 12.3(23)
	
	12.3(20a)
	
	12.3(21b)
	
	12.3(22a)
	
	12.3(18a)
	
	12.3(19a); available 16-Aug-07
	
	12.3(17c); available 16-Aug-07
	 
	12.2XI
	 Vulnerable; first fixed in 12.3(15) 
	 12.3(23)
	
	12.3(20a)
	
	12.3(21b)
	
	12.3(22a)
	
	12.3(18a)
	
	12.3(19a); available 16-Aug-07
	
	12.3(17c); available 16-Aug-07
	 
	12.2XJ
	 Vulnerable; first fixed in 12.3(15) 
	 12.3(23)
	
	12.3(20a)
	
	12.3(21b)
	
	12.3(22a)
	
	12.3(18a)
	
	12.3(19a); available 16-Aug-07
	
	12.3(17c); available 16-Aug-07
	 
	12.2XK
	 Vulnerable; first fixed in 12.3(15) 
	 12.3(23)
	
	12.3(20a)
	
	12.3(21b)
	
	12.3(22a)
	
	12.3(18a)
	
	12.3(19a); available 16-Aug-07
	
	12.3(17c); available 16-Aug-07
	 
	12.2XL
	 Vulnerable; first fixed in 12.3(15) 
	 12.3(23)
	
	12.3(20a)
	
	12.3(21b)
	
	12.3(22a)
	
	12.3(18a)
	
	12.3(19a); available 16-Aug-07
	
	12.3(17c); available 16-Aug-07
	 
	12.2XM
	 Vulnerable; first fixed in 12.3(15) 
	 12.3(23)
	
	12.3(20a)
	
	12.3(21b)
	
	12.3(22a)
	
	12.3(18a)
	
	12.3(19a); available 16-Aug-07
	
	12.3(17c); available 16-Aug-07
	 
	12.2XN
	 Vulnerable; first fixed in 12.3(15) 
	 12.3(23)
	
	12.3(20a)
	
	12.3(21b)
	
	12.3(22a)
	
	12.3(18a)
	
	12.3(19a); available 16-Aug-07
	
	12.3(17c); available 16-Aug-07
	 
	12.2XQ
	 Vulnerable; first fixed in 12.3(15) 
	 12.3(23)
	
	12.3(20a)
	
	12.3(21b)
	
	12.3(22a)
	
	12.3(18a)
	
	12.3(19a); available 16-Aug-07
	
	12.3(17c); available 16-Aug-07
	 
	12.2XR
	 Not Vulnerable
	   
	12.2XS
	 Not Vulnerable
	   
	12.2XT
	 Vulnerable; first fixed in 12.3(15) 
	 12.3(23)
	
	12.3(20a)
	
	12.3(21b)
	
	12.3(22a)
	
	12.3(18a)
	
	12.3(19a); available 16-Aug-07
	
	12.3(17c); available 16-Aug-07
	 
	12.2XU
	 Vulnerable; first fixed in 12.3(15) 
	 12.3(23)
	
	12.3(20a)
	
	12.3(21b)
	
	12.3(22a)
	
	12.3(18a)
	
	12.3(19a); available 16-Aug-07
	
	12.3(17c); available 16-Aug-07
	 
	12.2XV
	 Vulnerable; first fixed in 12.3(15) 
	 12.3(23)
	
	12.3(20a)
	
	12.3(21b)
	
	12.3(22a)
	
	12.3(18a)
	
	12.3(19a); available 16-Aug-07
	
	12.3(17c); available 16-Aug-07
	 
	12.2XW
	 Vulnerable; first fixed in 12.3(15) 
	 12.3(23)
	
	12.3(20a)
	
	12.3(21b)
	
	12.3(22a)
	
	12.3(18a)
	
	12.3(19a); available 16-Aug-07
	
	12.3(17c); available 16-Aug-07
	 
	12.2YA
	 Vulnerable; first fixed in 12.3(15) 
	 12.3(23)
	
	12.3(20a)
	
	12.3(21b)
	
	12.3(22a)
	
	12.3(18a)
	
	12.3(19a); available 16-Aug-07
	
	12.3(17c); available 16-Aug-07
	 
	12.2YB
	 Vulnerable; first fixed in 12.3(15) 
	 12.3(23)
	
	12.3(20a)
	
	12.3(21b)
	
	12.3(22a)
	
	12.3(18a)
	
	12.3(19a); available 16-Aug-07
	
	12.3(17c); available 16-Aug-07
	 
	12.2YC
	 Not Vulnerable
	   
	12.2YD
	 Vulnerable; first fixed in 12.3(14)T 
	 12.4(12c)
	
	12.4(3h)
	
	12.4(5c)
	
	12.4(8d); available 03-Sep-07
	
	12.4(7f)
	
	12.4(16)
	
	12.4(10c)
	
	12.4(13d)
	 
	12.2YE
	 Vulnerable; first fixed in 12.2(30)S 
	 12.2(25)S13
	
	12.2(14)S19
	 
	12.2YF
	 Vulnerable; first fixed in 12.3(15) 
	 12.3(23)
	
	12.3(20a)
	
	12.3(21b)
	
	12.3(22a)
	
	12.3(18a)
	
	12.3(19a); available 16-Aug-07
	
	12.3(17c); available 16-Aug-07
	 
	12.2YG
	 Not Vulnerable
	   
	12.2YH
	 Vulnerable; first fixed in 12.3(15) 
	 12.3(23)
	
	12.3(20a)
	
	12.3(21b)
	
	12.3(22a)
	
	12.3(18a)
	
	12.3(19a); available 16-Aug-07
	
	12.3(17c); available 16-Aug-07
	 
	12.2YJ
	 Vulnerable; first fixed in 12.3(15) 
	 12.3(23)
	
	12.3(20a)
	
	12.3(21b)
	
	12.3(22a)
	
	12.3(18a)
	
	12.3(19a); available 16-Aug-07
	
	12.3(17c); available 16-Aug-07
	 
	12.2YK
	 Not Vulnerable
	   
	12.2YL
	 Vulnerable; first fixed in 12.3(14)T 
	 12.4(12c)
	
	12.4(3h)
	
	12.4(5c)
	
	12.4(8d); available 03-Sep-07
	
	12.4(7f)
	
	12.4(16)
	
	12.4(10c)
	
	12.4(13d)
	 
	12.2YM
	 Vulnerable; first fixed in 12.3(14)T 
	 12.4(12c)
	
	12.4(3h)
	
	12.4(5c)
	
	12.4(8d); available 03-Sep-07
	
	12.4(7f)
	
	12.4(16)
	
	12.4(10c)
	
	12.4(13d)
	 
	12.2YN
	 Vulnerable; first fixed in 12.3(14)T 
	 12.4(12c)
	
	12.4(3h)
	
	12.4(5c)
	
	12.4(8d); available 03-Sep-07
	
	12.4(7f)
	
	12.4(16)
	
	12.4(10c)
	
	12.4(13d)
	 
	12.2YO
	 Not Vulnerable
	   
	12.2YP
	 Not Vulnerable
	   
	12.2YQ
	 Vulnerable; first fixed in 12.3(14)T 
	 12.4(12c)
	
	12.4(3h)
	
	12.4(5c)
	
	12.4(8d); available 03-Sep-07
	
	12.4(7f)
	
	12.4(16)
	
	12.4(10c)
	
	12.4(13d)
	 
	12.2YR
	 Vulnerable; first fixed in 12.3(14)T 
	 12.4(12c)
	
	12.4(3h)
	
	12.4(5c)
	
	12.4(8d); available 03-Sep-07
	
	12.4(7f)
	
	12.4(16)
	
	12.4(10c)
	
	12.4(13d)
	 
	12.2YS
	 Not Vulnerable
	   
	12.2YT
	 Vulnerable; first fixed in 12.3(15) 
	 12.3(23)
	
	12.3(20a)
	
	12.3(21b)
	
	12.3(22a)
	
	12.3(18a)
	
	12.3(19a); available 16-Aug-07
	
	12.3(17c); available 16-Aug-07
	 
	12.2YU
	 Vulnerable; first fixed in 12.3(14)T 
	 12.4(12c)
	
	12.4(3h)
	
	12.4(5c)
	
	12.4(8d); available 03-Sep-07
	
	12.4(7f)
	
	12.4(16)
	
	12.4(10c)
	
	12.4(13d)
	 
	12.2YV
	 Vulnerable; first fixed in 12.3(14)T 
	 12.4(12c)
	
	12.4(3h)
	
	12.4(5c)
	
	12.4(8d); available 03-Sep-07
	
	12.4(7f)
	
	12.4(16)
	
	12.4(10c)
	
	12.4(13d)
	 
	12.2YW
	 Vulnerable; first fixed in 12.3(14)T 
	 12.4(12c)
	
	12.4(3h)
	
	12.4(5c)
	
	12.4(8d); available 03-Sep-07
	
	12.4(7f)
	
	12.4(16)
	
	12.4(10c)
	
	12.4(13d)
	 
	12.2YX
	 Vulnerable; first fixed in 12.3(14)T 
	 12.4(12c)
	
	12.4(3h)
	
	12.4(5c)
	
	12.4(8d); available 03-Sep-07
	
	12.4(7f)
	
	12.4(16)
	
	12.4(10c)
	
	12.4(13d)
	 
	12.2YY
	 Vulnerable; first fixed in 12.3(14)T 
	 12.4(12c)
	
	12.4(3h)
	
	12.4(5c)
	
	12.4(8d); available 03-Sep-07
	
	12.4(7f)
	
	12.4(16)
	
	12.4(10c)
	
	12.4(13d)
	 
	12.2YZ
	 Vulnerable; first fixed in 12.2(30)S 
	 12.2(25)S13
	
	12.2(14)S19
	 
	12.2ZA
	 Vulnerable; first fixed in 12.2(18)SXE 
	   
	12.2ZB
	 Vulnerable; first fixed in 12.3(14)T 
	 12.4(12c)
	
	12.4(3h)
	
	12.4(5c)
	
	12.4(8d); available 03-Sep-07
	
	12.4(7f)
	
	12.4(16)
	
	12.4(10c)
	
	12.4(13d)
	 
	12.2ZC
	 Not Vulnerable
	   
	12.2ZD
	 Vulnerable; contact TAC 
	   
	12.2ZE
	 Vulnerable; first fixed in 12.3(15) 
	 12.3(23)
	
	12.3(20a)
	
	12.3(21b)
	
	12.3(22a)
	
	12.3(18a)
	
	12.3(19a); available 16-Aug-07
	
	12.3(17c); available 16-Aug-07
	 
	12.2ZF
	 Vulnerable; first fixed in 12.3(14)T 
	 12.4(12c)
	
	12.4(3h)
	
	12.4(5c)
	
	12.4(8d); available 03-Sep-07
	
	12.4(7f)
	
	12.4(16)
	
	12.4(10c)
	
	12.4(13d)
	 
	12.2ZG
	 Not Vulnerable
	   
	12.2ZH
	 12.2(13)ZH9; available 17-Aug-07
	 12.2(13)ZH9
	 
	12.2ZJ
	 Vulnerable; first fixed in 12.3(14)T 
	 12.4(12c)
	
	12.4(3h)
	
	12.4(5c)
	
	12.4(8d); available 03-Sep-07
	
	12.4(7f)
	
	12.4(16)
	
	12.4(10c)
	
	12.4(13d)
	 
	12.2ZL
	 Vulnerable, first fixed in 12.3(14)T for the Cisco 17xx; 
	
	first fixed in 12.4(1) for the Cisco 3200; 
	
	first fixed in 12.3(7)XR7, available 13-Aug-07 for the ICS7750
	   
	12.2ZP
	 Not Vulnerable
	   
	12.2ZR
	 Vulnerable; contact TAC 
	   
	12.2ZU
	 Not Vulnerable
	   
	12.2ZW
	 Not Vulnerable
	   
	12.2ZY
	 Not Vulnerable
	   
	Affected 12.3-Based Release 
	 First Fixed Release 
	 Recommended Release 
	 
	12.3
	 12.3(15) 
	
	12.3(16) 
	
	12.3(17a) 
	
	12.3(18) 
	
	12.3(19) 
	
	12.3(20) 
	
	12.3(21) 
	
	12.3(22) 
	
	12.3(23)
	 12.3(23)
	
	12.3(20a)
	
	12.3(21b)
	
	12.3(22a)
	
	12.3(18a)
	
	12.3(19a); available 16-Aug-07
	
	12.3(17c); available 16-Aug-07
	 
	12.3B
	 Vulnerable; first fixed in 12.3(14)T 
	 12.4(12c)
	
	12.4(3h)
	
	12.4(5c)
	
	12.4(8d); available 03-Sep-07
	
	12.4(7f)
	
	12.4(16)
	
	12.4(10c)
	
	12.4(13d)
	 
	12.3BC
	 12.3(17a)BC 
	
	12.3(21)BC
	 12.3(17b)BC8
	
	12.3(21a)BC3
	 
	12.3BW
	 Vulnerable; first fixed in 12.3(14)T 
	 12.4(12c)
	
	12.4(3h)
	
	12.4(5c)
	
	12.4(8d); available 03-Sep-07
	
	12.4(7f)
	
	12.4(16)
	
	12.4(10c)
	
	12.4(13d)
	 
	12.3JA
	 Not Vulnerable
	   
	12.3JEA
	 Not Vulnerable
	   
	12.3JEB
	 Not Vulnerable
	   
	12.3JK
	 Not Vulnerable
	   
	12.3JL
	 Not Vulnerable
	   
	12.3JX
	 Not Vulnerable
	   
	12.3T
	 Limited platform support is available
	
	12.3(11)T12; available 16-Aug-07
	
	12.3(14)T 
	 12.4(12c)
	
	12.4(3h)
	
	12.4(5c)
	
	12.4(8d); available 03-Sep-07
	
	12.4(7f)
	
	12.4(16)
	
	12.4(10c)
	
	12.4(13d)
	 
	12.3TPC
	 Not Vulnerable
	   
	12.3VA
	 Not Vulnerable
	   
	12.3XA
	 12.3(2)XA6
	 12.3(2)XA6
	 
	12.3XB
	 Vulnerable; first fixed in 12.3(14)T 
	 12.4(12c)
	
	12.4(3h)
	
	12.4(5c)
	
	12.4(8d); available 03-Sep-07
	
	12.4(7f)
	
	12.4(16)
	
	12.4(10c)
	
	12.4(13d)
	 
	12.3XC
	 12.3(2)XC5
	 12.3(2)XC5
	 
	12.3XD
	 Vulnerable; first fixed in 12.3(14)T 
	 12.4(12c)
	
	12.4(3h)
	
	12.4(5c)
	
	12.4(8d); available 03-Sep-07
	
	12.4(7f)
	
	12.4(16)
	
	12.4(10c)
	
	12.4(13d)
	 
	12.3XE
	 12.3(2)XE5; available 17-Aug-07
	 12.3(2)XE5
	 
	12.3XF
	 Vulnerable; first fixed in 12.3(14)T 
	 12.4(12c)
	
	12.4(3h)
	
	12.4(5c)
	
	12.4(8d); available 03-Sep-07
	
	12.4(7f)
	
	12.4(16)
	
	12.4(10c)
	
	12.4(13d)
	 
	12.3XG
	 Vulnerable; contact TAC 
	 12.4(12c)
	
	12.4(3h)
	
	12.4(5c)
	
	12.4(8d); available 03-Sep-07
	
	12.4(7f)
	
	12.4(16)
	
	12.4(10c)
	
	12.4(13d)
	 
	12.3XH
	 Vulnerable; first fixed in 12.3(14)T 
	 12.4(12c)
	
	12.4(3h)
	
	12.4(5c)
	
	12.4(8d); available 03-Sep-07
	
	12.4(7f)
	
	12.4(16)
	
	12.4(10c)
	
	12.4(13d)
	 
	12.3XI
	 12.3(7)XI10a; available 21-Aug-07
	 12.3(7)XI10a; available 21-Aug-07
	 
	12.3XJ
	 Vulnerable; first fixed in 12.3(14)YX 
	 12.3(14)YX9; available 13-Aug-07
	 
	12.3XK
	 Vulnerable; first fixed in 12.3(14)T 
	 12.4(12c)
	
	12.4(3h)
	
	12.4(5c)
	
	12.4(8d); available 03-Sep-07
	
	12.4(7f)
	
	12.4(16)
	
	12.4(10c)
	
	12.4(13d)
	 
	12.3XQ
	 Vulnerable; first fixed in 12.4(1) 
	 12.4(12c)
	
	12.4(3h)
	
	12.4(5c)
	
	12.4(8d); available 03-Sep-07
	
	12.4(7f)
	
	12.4(16)
	
	12.4(10c)
	
	12.4(13d)
	 
	12.3XR
	 12.3(7)XR7; available 17-Aug-07
	 12.3(7)XR7; available 17-Aug-07
	 
	12.3XS
	 Vulnerable; first fixed in 12.4(1) 
	 12.4(12c)
	
	12.4(3h)
	
	12.4(5c)
	
	12.4(8d); available 03-Sep-07
	
	12.4(7f)
	
	12.4(16)
	
	12.4(10c)
	
	12.4(13d)
	 
	12.3XU
	 Vulnerable; first fixed in 12.4(2)T 
	 12.4(11)T3
	
	12.4(9)T5; available 24-Aug-07
	
	12.4(2)T6; available 20-Aug-07
	
	12.4(4)T8; available 28-Aug-07
	
	12.4(6)T8
	
	12.4(15)T1
	 
	12.3XW
	 Vulnerable; first fixed in 12.3(14)YX 
	 12.3(14)YX9; available 13-Aug-07
	 
	12.3XY
	 Not Vulnerable
	   
	12.3YA
	 Vulnerable; first fixed in 12.4(1) 
	 12.4(12c)
	
	12.4(3h)
	
	12.4(5c)
	
	12.4(8d); available 03-Sep-07
	
	12.4(7f)
	
	12.4(16)
	
	12.4(10c)
	
	12.4(13d)
	
	12.3(8)YG6; available 16-Aug-07
	 
	12.3YD
	 Vulnerable; first fixed in 12.4(2)T 
	 12.4(11)T3
	
	12.4(9)T5; available 24-Aug-07
	
	12.4(2)T6; available 20-Aug-07
	
	12.4(4)T8; available 28-Aug-07
	
	12.4(6)T8
	
	12.4(15)T1
	 
	12.3YF
	 Vulnerable; first fixed in 12.3(14)YX 
	 12.3(14)YX9; available 13-Aug-07
	 
	12.3YG
	 12.3(8)YG6; available 16-Aug-07
	 12.3(8)YG6; available 16-Aug-07
	 
	12.3YH
	 Vulnerable; first fixed in 12.4(2)T 
	 12.4(11)T3
	
	12.4(9)T5; available 24-Aug-07
	
	12.4(2)T6; available 20-Aug-07
	
	12.4(4)T8; available 28-Aug-07
	
	12.4(6)T8
	
	12.4(15)T1
	 
	12.3YI
	 Vulnerable; first fixed in 12.4(2)T 
	 12.4(11)T3
	
	12.4(9)T5; available 24-Aug-07
	
	12.4(2)T6; available 20-Aug-07
	
	12.4(4)T8; available 28-Aug-07
	
	12.4(6)T8
	
	12.4(15)T1
	 
	12.3YJ
	 Vulnerable; first fixed in 12.3(14)YQ 
	 12.4(11)T3
	
	12.4(9)T5; available 24-Aug-07
	
	12.4(2)T6; available 20-Aug-07
	
	12.4(4)T8; available 28-Aug-07
	
	12.4(6)T8
	
	12.4(15)T1
	 
	12.3YK
	 12.3(11)YK3; available 20-Aug-07
	 12.3(11)YK3; available 20-Aug-07
	 
	12.3YM
	 Not Vulnerable
	   
	12.3YQ
	 Not Vulnerable
	   
	12.3YS
	 Not Vulnerable
	   
	12.3YT
	 Not Vulnerable
	   
	12.3YU
	 Not Vulnerable
	   
	12.3YX
	 Not Vulnerable
	   
	12.3YZ
	 12.3(11)YZ2; available 17-Aug-07
	 12.3(11)YZ2; available 17-Aug-07
	 
	Affected 12.4-Based Release 
	 First Fixed Release 
	 Recommended Release 
	 
	There are no affected 12.4 based releases
	 
	
	
	Cisco IOS XR
	The following table lists fixed Cisco IOS XR software. 
	
	Cisco IOS XR Version
	 SMU ID
	 SMU Name
	 
	3.2.3
	 AA01920
	 hfr-base-3.2.3.CSCsi74127
	 
	3.2.4
	 AA01919
	 hfr-base-3.2.4.CSCsi74127
	 
	3.2.6
	 AA01918
	 hfr-base-3.2.6.CSCsi74127
	 
	3.3.0
	 AA01917
	 hfr-base-3.3.0.CSCsi74127
	 
	3.3.1
	 AA01916
	 hfr-base-3.3.1.CSCsi74127
	 
	3.3.2
	 AA01915
	 hfr-base-3.3.2.CSCsi74127
	 
	3.3.3
	 AA01914
	 hfr-base-3.3.3.CSCsi74127
	 
	3.3.4
	 AA01913
	 hfr-base-3.3.4.CSCsi74127
	 
	3.4.0
	 AA01912
	 hfr-base-3.4.0.CSCsi74127
	 
	3.4.1
	 AA01911
	 hfr-base-3.4.1.CSCsi74127
	 
	3.4.2
	 AA02124
	 hfr-base-3.4.2.CSCsi74127
	 
	3.3.1
	 AA01910
	 c12k-base-3.3.1.CSCsi74127
	 
	3.4.0
	 AA01909
	 c12k-base-3.4.0.CSCsi74127
	 
	3.4.1
	 AA01908
	 c12k-base-3.4.1.CSCsi74127
	 
	
	
	IOS XR Package Installation Envelopes (PIE) can be downloaded from File 
	Exchange at: 
	https://upload.cisco.com/cgi-bin/swc/fileexg/main.cgi?CONTYPES=IOS-XR 
	( registered customers only) . Installation instructions are included 
	in the accompanying .txt files. 
	
	Workarounds 
	The workaround consists of filtering packets that contain Type 0 Routing 
	header(s). Special attention must be paid not to filter packets with 
	Type 2 Routing headers as that would break a Mobile IPv6 deployment. 
	Depending on which Cisco IOS software release is used, and if Mobile 
	IPv6 is deployed, there are several potential workarounds. Because any 
	packet type (TCP, UDP, ICMP) can be used to trigger this vulnerability, 
	care must be taken when implementing a workaround to account for a 
	spoofed IPv6 packet. 
	
	For devices running Cisco IOS XR and have mobile IPv6 deployed, there is 
	no workaround. 
	
	For additional information about protection mechanisms against IPv6 
	Routing headers, reference the "Countermeasures for the Malicious Use of 
	IPv6 Type 0 Routing Headers" Applied Intelligence white paper, available 
	at http://www.cisco.com/web/about/security/intelligence/countermeasures-
	for-ipv6-type0-rh.html. 
	
	Devices Running Cisco IOS
	Control Plane Policing 
	
	The following example is applicable irrespectively if Mobile IPv6 is, or 
	is not, deployed. 
	
	Control Plane Policing (CoPP) can be used to block untrusted IPv6 packets 
	with Type 0 Routing Headers present to the affected device. Cisco IOS 
	software releases 12.0S, 12.2SX, 12.2S, 12.3T, 12.4, and 12.4T support 
	the CoPP feature. CoPP may be configured on a device to protect the 
	management and control planes to minimize the risk and effectiveness of 
	direct infrastructure attacks by explicitly permitting only authorized 
	traffic sent to infrastructure devices in accordance with existing 
	security policies and configurations. The following example can be 
	adapted to your network. 
	
	
	!-- Permit all IPv6 Routing Header Type 0 (Source Route) packets
	!-- sent to any IPv6 address configured on interfaces of the  
	!-- affected device or IPv6 link-local addresses. This traffic 
	!-- will be policed and dropped by the CoPP feature. 
	! 
																	
	ipv6 access-list DENY-IPv6-RH0                                              
	 permit ipv6 any any routing-type 0
	
	!                                                                           
	!-- Permit (Police or Drop)/Deny (Allow) all other Layer3 and Layer4        
	!-- traffic in accordance with existing security policies and               
	!-- configurations for traffic that is authorized to be sent                
	!-- to infrastructure devices.                                              
	!                                                                           
	!-- Create a Class-Map for traffic to be policed by the CoPP feature.                                                                        
	!
	
	class-map match-all drop-IPv6-RH0-class                                     
	  match access-group name DENY-IPv6-RH0
	
	!                                                                           
	!-- Create a Policy-Map that will be applied to the Control-Plane of        
	!-- the device.  
	 
	policy-map drop-IPv6-RH0-traffic                                            
	  class drop-IPv6-RH0-class                                                 
		drop
	
	!                                                                           
	!-- Apply the Policy-Map to the Control-Plane of the device.
	
	control-plane                                                               
	  service-policy input drop-IPv6-RH0-traffic                                
	
	!
	
	In the above CoPP example, the access control list entries (ACEs), which 
	match the potential exploit packets with the "permit" action, result in 
	these packets being discarded by the policy-map "drop" function. 
	
	Additional information on the configuration and use of the CoPP feature 
	can be found at http://www.cisco.com/en/US/products/ps6642/products_white
	_paper0900aecd804fa16a.shtml and http://www.cisco.com/en/US/products/sw/
	iosswrel/ps1838/products_feature_guide09186a008052446b.html. 
	
	Mobile IPv6 is Not Deployed 
	
	For IOS releases prior to 12.2(15)T, the workaround is to use ACLs to 
	filter all packets that contain Routing headers. This method can not 
	distinguish between Type 0 and Type 2 Routing headers, so it is not 
	suitable if Mobile IPv6 is deployed. 
	
	The following example shows how to configure such ACLs: 
	
	Router(config)#ipv6 access-list deny-sourcerouted 
	Router(config-ipv6-acl)#deny ipv6 any <myaddress1> routing 
	Router(config-ipv6-acl)#deny ipv6 any <myaddress2> routing 
	Router(config-ipv6-acl)#permit ipv6 any any
	
	Router(config-ipv6-acl)#exit
	Router(config)#interface Ethernet0
	Router(config-if)#ipv6 traffic-filter deny-sourcerouted in
	In the above example <myaddressX> is an IPv6 address. One example of such 
	an address is 2001:DB8:900D::1/64. The ACL must be applied to all 
	interfaces and include all IPv6 addresses that are configured. If an 
	interface has more than one IPv6 address configured then all addresses 
	must be covered by the ACLs. This also includes all loopback and link 
	local addresses for each interface. 
	
	The alternative to enumerating all IPv6 addresses is to use the statement 
	deny ipv6 any any routing. While that simplifies the resulting ACL, it 
	will also filter all transit IPv6 traffic with Routing headers 0 and 2. 
	The example in which all configured IPv6 addresses are enumerated will 
	not affect transit traffic. This is applicable to all other examples in 
	this advisory. 
	
	Starting from the IOS release 12.2(15)T, a new command, ipv6 source-route 
	was introduced. If applied, it will drop any IPv6 packet with Type 0 
	Routing Headers received by the device itself (for example, IPv6 
	destination address matches any of the IPv6 addresses configured on the 
	device). The command does not affects transit traffic. The configuration 
	is given in the following example: 
	
	Router(config)#no ipv6 source-route 
	This is a global command and it applies to all interfaces. The command is 
	applicable on all defined IPv6 addresses, including the link local and 
	loopback address, and on all interfaces. 
	
	Mobile IPv6 is Deployed 
	
	There is no workaround for devices running a Cisco IOS release prior to 
	12.2(15)T. Starting from the IOS release 12.2(15)T, a new command, ipv6 
	source-route was introduced. If applied, it will drop any IPv6 packet 
	with Type 0 Routing Headers received by the device itself (for example, 
	IPv6 destination address matches any of the IPv6 addresses configured on 
	the device). The command does not affects transit traffic. The 
	configuration is given in the following example: 
	
	Router(config)#no ipv6 source-route This is a global command and it 
	applies to all interfaces. The command is applicable on all defined IPv6 
	addresses, including the link local and loopback address, and on all 
	interfaces. 
	
	In IOS 12.4(2)T, a new keyword routing-type is added to IPv6 ACLs. It can 
	be used to selectively permit or deny specific routing types. 
	
	Router(config)#ipv6 access-list deny-sourcerouted
	Router(config-ipv6-acl)#deny ipv6 any <myaddress1> routing-type 0 
	Router(config-ipv6-acl)#permit ipv6 any any 
	Router(config)#interface Ethernet0
	Router(config-if)#ipv6 traffic-filter deny-sourcerouted in
	The above IPv6 ACL must be applied inbound on all interfaces on which an 
	IPv6 address is configured. 
	
	Devices Running Cisco IOS XR
	Mobile IPv6 is Not Deployed 
	
	The workaround is to use ACLs to filter all packets that contain Routing 
	headers. This method can not distinguish between Type 0 and Type 2 
	Routing headers, so it is not suitable if Mobile IPv6 is deployed. 
	
	The following example shows how to configure such ACLs: 
	
	Router-IOS_XR#configure terminal
	Router-IOS_XR(config)#ipv6 access-list deny-ipv6-type0-rh                  
	Router-IOS_XR(config-ipv6-acl)#deny ipv6 any host 2001:0DB8:12::3 routing 
	Router-IOS_XR(config-ipv6-acl)#permit ipv6 any any
	Router-IOS_XR(config-ipv6-acl)#exit
	Router-IOS_XR(config)#interface GigabitEthernet 0/0/0/1
	Router-IOS_XR(config-if)#ipv6 access-group deny-ipv6-type0-rh ingress
	Router-IOS_XR(config-if)#end
	
	The ACL must be applied to all interfaces and include all IPv6 addresses 
	that are configured. If an interface has more than one IPv6 address 
	configured then all addresses must be covered by the ACLs. This also 
	includes all loopback and link local addresses for each interface. 
	
	Mobile IPv6 is Deployed 
	
	There is no workaround if Mobile IPv6 is deployed. 
	
	Obtaining Fixed Software 
	Cisco will make free software available to address this vulnerability 
	for affected customers. This advisory will be updated as fixed software 
	becomes available. Prior to deploying software, customers should consult 
	their maintenance provider or check the software for feature set 
	compatibility and known issues specific to their environment. 
	
	Customers may only install and expect support for the feature sets they 
	have purchased. By installing, downloading, accessing or otherwise using 
	such software upgrades, customers agree to be bound by the terms of 
	Cisco's software license terms found at 
	http://www.cisco.com/public/sw-license-agreement.html, or as otherwise 
	set forth at Cisco.com Downloads at 
	http://www.cisco.com/public/sw-center/sw-usingswc.shtml. 
	
	Do not contact either "psirt@cisco.com" or "security-alert@cisco.com" 
	for software upgrades. 
	
	Customers with Service Contracts 
	Customers with contracts should obtain upgraded software through their 
	regular update channels. For most customers, this means that upgrades 
	should be obtained through the Software Center on Cisco's worldwide 
	website at http://www.cisco.com. 
	
	Customers using Third-party Support Organizations 
	Customers whose Cisco products are provided or maintained through prior 
	or existing agreement with third-party support organizations such as 
	Cisco Partners, authorized resellers, or service providers should 
	contact that support organization for guidance and assistance with the 
	appropriate course of action in regards to this advisory. 
	
	The effectiveness of any workaround or fix is dependent on specific 
	customer situations such as product mix, network topology, traffic 
	behavior, and organizational mission. Due to the variety of affected 
	products and releases, customers should consult with their service 
	provider or support organization to ensure any applied workaround or 
	fix is the most appropriate for use in the intended network before it 
	is deployed. 
	
	Customers without Service Contracts 
	Customers who purchase direct from Cisco but who do not hold a Cisco 
	service contract and customers who purchase through third-party vendors 
	but are unsuccessful at obtaining fixed software through their point of 
	sale should get their upgrades by contacting the Cisco Technical 
	Assistance Center (TAC). TAC contacts are as follows. 
	
	+1 800 553 2447 (toll free from within North America) 
	
	+1 408 526 7209 (toll call from anywhere in the world) 
	
	e-mail: tac@cisco.com 
	
	Have your product serial number available and give the URL of this notice 
	as evidence of your entitlement to a free upgrade. Free upgrades for 
	non-contract customers must be requested through the TAC. 
	
	Refer to http://www.cisco.com/warp/public/687/Directory/DirTAC.shtml for 
	additional TAC contact information, including special localized telephone 
	numbers and instructions and e-mail addresses for use in various languages.
	
	Exploitation and Public Announcements 
	The Cisco PSIRT is not aware of any public announcements or malicious use 
	of the vulnerability described in this advisory. 
	
	This vulnerability was initially rectified internally within Cisco during 
	hardening IPv6 protocol. It was subsequently re-discovered and reported by 
	Tom Cross from IBM Internet Security Systems X-Force. 
	
	Status of This Notice: FINAL 
	THIS DOCUMENT IS PROVIDED ON AN "AS IS" BASIS AND DOES NOT IMPLY ANY KIND 
	OF GUARANTEE OR WARRANTY, INCLUDING THE WARRANTIES OF MERCHANTABILITY OR 
	FITNESS FOR A PARTICULAR USE. YOUR USE OF THE INFORMATION ON THE DOCUMENT 
	OR MATERIALS LINKED FROM THE DOCUMENT IS AT YOUR OWN RISK. CISCO RESERVES 
	THE RIGHT TO CHANGE OR UPDATE THIS DOCUMENT AT ANY TIME.
	
	A stand-alone copy or Paraphrase of the text of this document that omits 
	the distribution URL in the following section is an uncontrolled copy, 
	and may lack important information or contain factual errors.
	
	Distribution 
	This advisory is posted on Cisco's worldwide website at 
	http://www.cisco.com/warp/public/707/cisco-sa-20070808-IOS-IPv6-leak.shtml. 
	
	In addition to worldwide web posting, a text version of this notice is 
	clear-signed with the Cisco PSIRT PGP key and is posted to the following 
	e-mail and Usenet news recipients.
	
	cust-security-announce@cisco.com
	
	first-teams@first.org
	
	bugtraq@securityfocus.com 
	
	vulnwatch@vulnwatch.org 
	
	cisco@spot.colorado.edu 
	
	cisco-nsp@puck.nether.net 
	
	full-disclosure@lists.grok.org.uk
	
	comp.dcom.sys.cisco@newsgate.cisco.com 
	
	Future updates of this advisory, if any, will be placed on Cisco's 
	worldwide website, but may or may not be actively announced on mailing 
	lists or newsgroups. Users concerned about this problem are encouraged to 
	check the above URL for any updates. 
	
	Revision History 
	Revision 1.1
	 2007-August-09
	 Added fix information for IOS XR v3.4.2 running on CRS-1.
	 
	Revision 1.0
	 2007-August-08
	 Initial public release.
	 
	
	
	
	
	[***** End Cisco Security Advisory Document ID: 97848 *****]
	_______________________________________________________________________________
	
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	information contained in this bulletin.
	_______________________________________________________________________________
	
	
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