__________________________________________________________ The U.S. Department of Energy Computer Incident Advisory Capability ___ __ __ _ ___ / | /_\ / \___ __|__ / \ \___ __________________________________________________________ INFORMATION BULLETIN Symantec Veritas NetBackup [SYM06-024 ] December 14, 2006 18:00 GMT Number R-080 ______________________________________________________________________________ PROBLEM: Multiple vulnerabilities have been identified in Symantec's Veritas NetBackup Master, Media Servers and clients. An attacker, able to access a vulnerable NetBackup host and successfully exploit these issues, could potentially cause execution of arbitrary code resulting in possible unauthorized, elevated access to the targeted system. PLATFORM: NetBackup Enterprise Server/NetBackup Server; Server and client and Storage Migrator for Unix option versions 5.0, 5.1, 6.0 DAMAGE: The overflows occur due to a failure to do proper input validation of incoming data. A remote attacker who successfully gains network access to an affected system and successfully passes a specifically crafted packet through one of the identified vectors to this vulnerable daemon could potentially execute arbitrary code with elevated privilege on the targeted system. Also, NetBackup fails to properly check the logic on incoming commands. A remote attacker who successfully gains access to the targeted system can append commands to a valid command and potentially leverage this issue to run arbitrary commands with elevated privilege on the targeted system. Note that the ports used by NetBackup are normally blocked for access from the external network. SOLUTION: Apply current patches. ______________________________________________________________________________ VULNERABILITY The risk is HIGH. An attacker could potentially cause execution ASSESSMENT: of arbitrary code resulting in possible unauthorized, elevated access to the targeted system. ______________________________________________________________________________ LINKS: CIAC BULLETIN: http://www.ciac.org/ciac/bulletins/r-080.shtml ORIGINAL BULLETIN: http://securityresponse.symantec.com/avcenter/security/Content/2006.12.13a.html CVE: http://www.cve.mitre.org/cgi-bin/cvename.cgi?name= CVE-2006-4902 CVE-2006-5822 CVE-2006-6222 ______________________________________________________________________________ [***** Start SYM06-024 *****] SYM06-024 December 13, 2006 Symantec Veritas NetBackup: Vulnerabilities in NetBackup Server and Clients Revision History None Severity High (very configuration-dependent) NOTE: In recommended installations, Symantec Veritas NetBackup systems should always be configured to be restricted to trusted-host access. The Veritas NetBackup Server and clients should never be exposed external to the network. The servers and clients could still be potentially susceptible to an insider-based attack however; this recommended configuration greatly reduces the risk from unauthorized remote access through external, unauthenticated vectors. Remote Yes Local No Authentication Required Yes, if properly configured to authenticate connecting hosts and/or only accept connections from trusted / authorized hosts Exploit publicly available No Overview Multiple vulnerabilities have been identified in Symantec's Veritas NetBackup Master, Media Servers and clients. An attacker, able to access a vulnerable NetBackup host and successfully exploit these issues, could potentially cause execution of arbitrary code resulting in possible unauthorized, elevated access to the targeted system. Product(s) Affected Product Version Build Platform Solution(s) NetBackup Enterprise Server/NetBackup Server; Server and client and Storage Migrator for Unix option 6.0 All All 6.0_MP4 NetBackup Enterprise Server/NetBackup Server; Server and client and Storage Migrator for Unix option 5.1 All All 5.1_MP6 NetBackup Enterprise Server/NetBackup Server; Server and client and Storage Migrator for Unix option 5.0 All All 5.0_MP7 Details TippingPoint, a division of 3Com, notified Symantec of two buffer overflow vulnerabilities identified in the NetBackup bpcd daemon running on Symantec Veritas NetBackup Enterprise Servers and NetBackup Server and client systems as well as on Storage Migrator for Unix if that option is installed. The overflows occur due to a failure to do proper input validation of incoming data. A remote attacker who successfully gains network access to an affected system and successfully passes a specifically crafted packet through one of the identified vectors to this vulnerable daemon could potentially execute arbitrary code with elevated privilege on the targeted system. IBM Internet Security Systems notified Symantec of an additional programming logic error in how the bpcd daemon handles incoming system commands. NetBackup fails to properly check the logic on incoming commands. A remote attacker who successfully gains access to the targeted system can append commands to a valid command and potentially leverage this issue to run arbitrary commands with elevated privilege on the targeted system. Symantec Response Symantec takes the security of our products and our customers very seriously. Symantec engineers have verified and corrected these issues in all currently supported versions of NetBackup. During a recent, focused, internal review of supported NetBackup product versions, Symantec engineers identified additional areas that could present potential security concerns. Symantec engineers were already in the process of preparing and testing updates for these issues and have accelerated relevant updates into the referenced Maintenance Pack releases to aid in addressing these issues. Maintenance Pack updates are available for all supported products. The Maintenance Packs contain cumulative security-related fixes as well as additional product enhancements and technical updates. Symantec strongly recommends customers apply the latest Maintenance Pack releases available for their supported product versions to enhance their security posture and protect against potential security threats of this nature. Symantec knows of no exploitation of or adverse customer impact from any of the issues noted in this advisory. The patches listed above for affected products are available from the "Related Documents" section of the following Technote: http://entsupport.symantec.com/docs/285082 Mitigations Implement NetBackup Access Control (NBAC) on NetBackup Servers and Clients NBAC provides host-based authentication and user-level authorization through Veritas Security Services (VxSS) at both the server and the client to ensure communications are with a trusted host. Implement Trusted-Host access through configuration files Daemons associated with Veritas NetBackup services provide Trusted-Host access through the appropriate configuration files. Some of the services allow access by default while others deny access by default depending on the functionality of the service. Customers should follow the documentation provided for each service to ensure they have implemented a trusted-host relationship appropriate for their network. The vmd, oprd and robotic daemons derive access control from the vm.conf file which allows access by default if there is no SERVER entry entered. Using an appropriate text editor, configure vm.conf's "SERVER=" for allowed host entries. Once a "SERVER=" list is compiled, the associated daemons will ONLY trust and allow hosts annotated in vm.conf. Any malicious user or attacker would have to have either authorized access to or gain unauthorized access to one of the trusted-hosts to attempt attacks against a targeted server. All other daemons associated with Veritas NetBackup derive access control from the NetBackup configuration which denies access by default. Edit the configuration using "host properties" in the GUI to allow only those hosts that require access to associated NetBackup services. Any malicious user or attacker would have to have either authorized access to or gain unauthorized access to one of the trusted-hosts to attempt attacks against a targeted server. Best Practices As part of normal best practices, Symantec strongly recommends: * Restrict access to administration or management systems to privileged users. * Restrict remote access, if required, to trusted/authorized systems only. * Run under the principle of least privilege where possible to limit the impact of exploit by threats such as this. * Keep all operating systems and applications updated with the latest vendor patches. * Follow a multi-layered approach to security. Run both firewall and antivirus applications, at a minimum, to provide multiple points of detection and protection to both inbound and outbound threats. * Deploy network intrusion detection systems to monitor network traffic for signs of anomalous or suspicious activity. This may aid in detection of attacks or malicious activity related to exploitation of latent vulnerabilities CVE The Common Vulnerabilities and Exposures (CVE) initiative has assigned CVE Candidate numbers to these issues. CVE Candidates CVE-2006-6222 and CVE-2006-5822 are assigned to the bpcd daemon buffer overflow issues identified by 3Com ZDI. CVE Candidate CVE-2006-4902 is assigned to the bpcd daemon programming logic error identified by ISS. This issue is a candidate for inclusion in the CVE list (http://cve.mitre.org), which standardizes names for security problems. Credit Symantec would like to thank Sebastian Apelt working with TippingPoint and the Zero Day Initiative for reporting the issues referenced in CVE-2006-6222 and CVE-2006-5822 and providing full coordination while Symantec resolved them. Symantec would also like to thank Paul Metha, a member of IBM Internet Security System's X-Force Research Team, for reporting the issue referenced in CVE-2006-4902 and providing full coordination while Symantec resolved it. [***** End SYM06-024 *****] _______________________________________________________________________________ CIAC wishes to acknowledge the contributions of Symantec for the information contained in this bulletin. _______________________________________________________________________________ CIAC, the Computer Incident Advisory Capability, is the computer security incident response team for the U.S. Department of Energy (DOE) and the emergency backup response team for the National Institutes of Health (NIH). CIAC is located at the Lawrence Livermore National Laboratory in Livermore, California. CIAC is also a founding member of FIRST, the Forum of Incident Response and Security Teams, a global organization established to foster cooperation and coordination among computer security teams worldwide. CIAC services are available to DOE, DOE contractors, and the NIH. CIAC can be contacted at: Voice: +1 925-422-8193 (7x24) FAX: +1 925-423-8002 STU-III: +1 925-423-2604 E-mail: ciac@ciac.org Previous CIAC notices, anti-virus software, and other information are available from the CIAC Computer Security Archive. World Wide Web: http://www.ciac.org/ Anonymous FTP: ftp.ciac.org PLEASE NOTE: Many users outside of the DOE, ESnet, and NIH computing communities receive CIAC bulletins. If you are not part of these communities, please contact your agency's response team to report incidents. Your agency's team will coordinate with CIAC. The Forum of Incident Response and Security Teams (FIRST) is a world-wide organization. A list of FIRST member organizations and their constituencies can be obtained via WWW at http://www.first.org/. This document was prepared as an account of work sponsored by an agency of the United States Government. Neither the United States Government nor the University of California nor any of their employees, makes any warranty, express or implied, or assumes any legal liability or responsibility for the accuracy, completeness, or usefulness of any information, apparatus, product, or process disclosed, or represents that its use would not infringe privately owned rights. Reference herein to any specific commercial products, process, or service by trade name, trademark, manufacturer, or otherwise, does not necessarily constitute or imply its endorsement, recommendation or favoring by the United States Government or the University of California. The views and opinions of authors expressed herein do not necessarily state or reflect those of the United States Government or the University of California, and shall not be used for advertising or product endorsement purposes. LAST 10 CIAC BULLETINS ISSUED (Previous bulletins available from CIAC) R-070: BrightStor ARCserve Backup R-071: Cisco Security Agent Management Center LDAP Administrator Authentication Bypass R-072: Security Vulnerabilities in Solaris ld.so.1(1) R-073: Vulnerability in SNMP (926247) R-074: Cumulative Security Update for Internet Explorer (925454) R-075: Vulnerability in Visual Studio 2005 (925674) R-076: Vulnerability in Windows Media Format (923689) R-077: Vulnerability in Windows (926255) R-078: Cumulative Security Update for Outlook Express (923694) R-079: Vulnerability in Remote Installation Service (926121)