__________________________________________________________

                       The U.S. Department of Energy
                   Computer Incident Advisory Capability
                           ___  __ __    _     ___
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             __________________________________________________________

                             INFORMATION BULLETIN

                 RealNetworks RealPlayer ActiveX Vulnerability
                       [US-CERT Vulnerability VU#831457]

March 27, 2008 14:00 GMT                                          Number S-235
______________________________________________________________________________
PROBLEM:       Multiple realPlayer ActiveX controls fail to properly handle 
               properties, which can allow a remote, unauthenticated attacker 
               to execute arbitrary code on a vulnerable system. 
PLATFORM:      RealNetworks RealPlayer 
DAMAGE:        Execute arbitrary code. 
SOLUTION:      There is no practical solution. Please see bulletin below for 
               possible workaround. 
______________________________________________________________________________
VULNERABILITY  The risk is MEDIUM. By convincing a user to view a specially 
ASSESSMENT:    crafted HTML document (e.g., a web page or an HTML email 
               message or attachment), an attacker may be able to execute 
               arbitrary code with the privileges of the user. 
______________________________________________________________________________
CVSS 2 BASE SCORE: 5.8 
 TEMPORAL SCORE:   5.0 
 VECTOR:           (AV:N/AC:M/Au:N/C:P/I:P/A:N/E:POC/RL:W/RC:C) 
______________________________________________________________________________
LINKS: 
 CIAC BULLETIN:      http://www.ciac.org/ciac/bulletins/s-235.shtml 
 ORIGINAL BULLETIN:  http://www.kb.cert.org/vuls/id/831457 
______________________________________________________________________________
[***** Start US-CERT Vulnerability VU#831457 *****]


Vulnerability Note VU#831457
RealNetworks RealPlayer ActiveX controls property heap memory corruption

Overview
Multiple RealPlayer ActiveX controls fail to properly handle properties, which 
can allow a remote, unauthenticated attacker to execute arbitrary code on a 
vulnerable system. 


I. Description
RealNetworks RealPlayer provides multiple ActiveX controls to allow integration 
with Internet Explorer. The ActiveX controls provided by the file rmoc3260.dll 
fail to properly handle multiple properties, including Console. Setting these 
properties can result in heap memory corruption.


II. Impact
By convincing a user to view a specially crafted HTML document (e.g., a web page 
or an HTML email message or attachment), an attacker may be able to execute 
arbitrary code with the privileges of the user.


III. Solution
We are currently unaware of a practical solution to this problem. Please consider 
the following workarounds: 
Disable the RealPlayer ActiveX controls in Internet Explorer

The vulnerable ActiveX controls can be disabled in Internet Explorer by setting 
the kill bit for the following CLSIDs:


{0FDF6D6B-D672-463B-846E-C6FF49109662}
{224E833B-2CC6-42D9-AE39-90B6A38A4FA2}
{2F542A2E-EDC9-4BF7-8CB1-87C9919F7F93}
{3B46067C-FD87-49B6-8DDD-12F0D687035F}
{3B5E0503-DE28-4BE8-919C-76E0E894A3C2}
{44CCBCEB-BA7E-4C99-A078-9F683832D493}
{A1A41E11-91DB-4461-95CD-0C02327FD934}
{CFCDAA03-8BE4-11CF-B84B-0020AFBBCCFA}

More information about how to set the kill bit is available in Microsoft Support 
Document 240797. Alternatively, the following text can be saved as a .REG file 
and imported to set the kill bit for these controls:

Windows Registry Editor Version 5.00

[HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Internet Explorer\ActiveX Compatibility\
{0FDF6D6B-D672-463B-846E-C6FF49109662}]
"Compatibility Flags"=dword:00000400

[HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Internet Explorer\ActiveX Compatibility\
{224E833B-2CC6-42D9-AE39-90B6A38A4FA2}]
"Compatibility Flags"=dword:00000400

[HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Internet Explorer\ActiveX Compatibility\
{2F542A2E-EDC9-4BF7-8CB1-87C9919F7F93}]
"Compatibility Flags"=dword:00000400

[HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Internet Explorer\ActiveX Compatibility\
{3B46067C-FD87-49B6-8DDD-12F0D687035F}]
"Compatibility Flags"=dword:00000400

[HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Internet Explorer\ActiveX Compatibility\
{3B5E0503-DE28-4BE8-919C-76E0E894A3C2}]
"Compatibility Flags"=dword:00000400

[HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Internet Explorer\ActiveX Compatibility\
{44CCBCEB-BA7E-4C99-A078-9F683832D493}]
"Compatibility Flags"=dword:00000400

[HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Internet Explorer\ActiveX Compatibility\
{A1A41E11-91DB-4461-95CD-0C02327FD934}]
"Compatibility Flags"=dword:00000400

[HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Internet Explorer\ActiveX Compatibility\
{CFCDAA03-8BE4-11CF-B84B-0020AFBBCCFA}]
"Compatibility Flags"=dword:00000400

Disable ActiveX

Disabling ActiveX controls in the Internet Zone (or any zone used by an attacker) 
appears to prevent exploitation of this and other ActiveX vulnerabilities. 
Instructions for disabling ActiveX in the Internet Zone can be found in the 
"Securing Your Web Browser" document.  

Systems Affected
Vendor Status Date Updated 
RealNetworks, Inc. Vulnerable 11-Mar-2008 

References

http://secunia.com/advisories/29315/
http://archives.neohapsis.com/archives/fulldisclosure/2008-03/0157.html
http://isc.sans.org/diary.html?storyid=4120
http://lists.grok.org.uk/pipermail/full-disclosure/2008-March/060659.html 

Credit
This vulnerability was publicly disclosed by Elazar Broad. 

This document was written by Will Dormann. 

Other Information
Date Public 03/10/2008 
Date First Published 03/11/2008 01:55:45 PM 
Date Last Updated 03/11/2008 
CERT Advisory   
CVE Name   
US-CERT Technical Alerts   
Metric 17.15 
Document Revision 2 

[***** End US-CERT Vulnerability VU#831457 *****]
_______________________________________________________________________________

CIAC wishes to acknowledge the contributions of US-CERT for the 
information contained in this bulletin.
_______________________________________________________________________________


CIAC, the Computer Incident Advisory Capability, is the computer
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