Title: CA20090126-01: CA Anti-Virus Engine Detection Evasion Multiple Vulnerabilities CA Advisory Reference: CA20090126-01 CA Advisory Date: 2009-01-26 CA Advisory Updated: May 12, 2009 Reported By: Thierry Zoller and Sergio Alvarez of n.runs AG Impact: A remote attacker can evade detection. Summary: The CA Anti-Virus engine contains multiple vulnerabilities that can allow a remote attacker to evade detection by the Anti-Virus engine by creating a malformed archive file in one of several common file archive formats. CA has released a new Anti-Virus engine to address the vulnerabilities. The vulnerabilities, CVE-2009-0042, are due to improper handling of malformed archive files by the Anti-Virus engine. A remote attacker can create a malformed archive file that potentially contains malware and evade anti-virus detection. Note: After files have been extracted from an archive, the desktop Anti-Virus engine is able to scan all files for malware. Consequently, detection evasion can be a concern for gateway anti-virus software if archives are not scanned, but the risk is effectively mitigated by the desktop anti-virus engine. Mitigating Factors: See note above. Severity: CA has given these vulnerabilities a Low risk rating. Affected Products: CA Anti-Virus for the Enterprise (formerly eTrust Antivirus) 7.1, r8, r8.1 CA Anti-Virus 2007 (v8), 2008 eTrust EZ Antivirus r6.1, r7, r7.1 CA Internet Security Suite 2007 (v3), 2008 CA Internet Security Suite Plus 2008 CA Threat Manager for the Enterprise (formerly eTrust Integrated Threat Management) r8, 8.1 CA Anti-Virus Gateway (formerly eTrust Antivirus Gateway) 7.1 CA Gateway Security r8.1 CA Protection Suites r2, r3, r3.1 CA Secure Content Manager (formerly eTrust Secure Content Manager) 1.1, 8.0, 8.1 CA Anti-Spyware for the Enterprise (Formerly eTrust PestPatrol) r8, 8.1 CA Anti-Spyware 2007, 2008 CA Network and Systems Management (NSM) (formerly Unicenter Network and Systems Management) r3.0, r3.1, r11, r11.1 CA ARCserve Backup r11.1, r11.5, r12 on Windows CA ARCserve Backup r11.1, r11.5 Linux CA ARCserve for Windows Client Agent CA ARCserve for Windows Server component CA eTrust Intrusion Detection 2.0 SP1, 3.0, 3.0 SP1 CA Common Services (CCS) r3.1, r11, r11.1 CA Anti-Virus SDK (formerly eTrust Anti-Virus SDK) Non-Affected Products: CA Anti-Virus engine with arclib version 7.3.0.15 installed Affected Platforms: Windows UNIX Linux Solaris Mac OS X NetWare Status and Recommendation: CA released arclib 7.3.0.15 in September 2008. If your product is configured for automatic updates, you should already be protected, and you need to take no action. If your product is not configured for automatic updates, then you simply need to run the update utility included with your product. CA Network and Systems Management (NSM) r11.1 SP1, and CA Common Services (CCS) r11.1 SP1: apply fix #RO05417. CA Common Services (CCS) r3.1: apply fix #RO05418. CA Anti-Virus for the Enterprise (formerly eTrust Antivirus) 7.1: apply fix #RO01955. CA Secure Content Manager (formerly eTrust Secure Content Manager) r1.1: apply fix #RO05629. CA Secure Content Manager (formerly eTrust Secure Content Manager) r8.0: apply fix #RO05309. CA Secure Content Manager (formerly eTrust Secure Content Manager) r8.1: apply fix #RO05868. CA Anti-Virus Gateway (formerly eTrust Antivirus Gateway) 7.1: apply fix #RO05631. CA Gateway Security r8.1: apply Cumulative Fix 1. CA ARCserve for Windows Server component installed on a 64 bit machine: apply fixes # RO01955 and RO01956. CA ARCserve for Windows Server component installed on a 32 bit machine: apply fix # RO01955. CA ARCserve for Windows Client Agent installed on a 64 bit machine: apply fix # RO01956. CA ARCserve for Windows Client Agent installed on a 32 bit machine: apply fix # RO01955. CA ARCserve for Linux Server r11.5: apply fix # RO01959. CA ARCserve for Linux: 1. Download RO01959.tar.Z from RO01959 into a temporary location /tmp/RO01959 2. Uncompress and untar RO01959.tar.Z as follows: uncompress RO01959.tar.Z tar -xvf RO01959.tar The new "libarclib.so" will be extracted to /tmp/RO01959 3. Change the directory to $CAIGLBL0000/ino/config as follows: cd $CAIGLBL0000/ino/config 4. Rename "libarclib.so" to "libarclib.so.RO01959" as follows: mv libarclib.so libarclib.so.RO01959 5. Copy the new libarclib.so as follows: cp /tmp/RO01959/libarclib.so $CAIGLBL0000/ino/config/. 6. chmod +x $CAIGLBL0000/ino/config/libarclib.so 7. Stop the common agent (caagent stop) 8. Change the directory to ARCserve common agent directory (typically /opt/CA/BABcmagt) cd /opt/CA/BABcmagt Note: To find out the agent home directory run the following command: dirname `ls -l /usr/bin/caagent |cut -f2 -d">"` 9. Save a copy of libarclib.so cp -p libarclib.so libarclib.so.RO01959 10. Copy over the new libarclib.so as follows: cp $/tmp/RO01959/libarclib.so . 11. Start the common agent (caagent start) 12. Repeat steps (7-11) on all remote Linux client agents' installations. 13. rm -rf /tmp/RO01959 How to determine if you are affected: For products on Windows: 1. Using Windows Explorer, locate the file "arclib.dll". By default, the file is located in the "C:\Program Files\CA\SharedComponents\ScanEngine" directory (*). 2. Right click on the file and select Properties. 3. Select the Version tab. 4. If the file version is earlier than indicated below, the installation is vulnerable. File Name File Version arclib.dll 7.3.0.15 *For eTrust Intrusion Detection 2.0 the file is located in "Program Files\eTrust\Intrusion Detection\Common", and for eTrust Intrusion Detection 3.0 and 3.0 sp1, the file is located in "Program Files\CA\Intrusion Detection\Common". For CA Anti-Virus r8.1 on non-Windows platforms: Use the compver utility provided on the CD to determine the version of Arclib. If the version is less than 7.3.0.15, the installation is vulnerable. Example compver utility output: ------------------------------------------------ COMPONENT NAME VERSION ------------------------------------------------ eTrust Antivirus Arclib Archive Library 7.3.0.15 ... (followed by other components) For reference, the following are file names for arclib on non-Windows operating systems: Operating System File name Solaris libarclib.so Linux libarclib.so Mac OS X arclib.bundle Workaround: Do not open email attachments or download files from untrusted sources. References (URLs may wrap): CA Support: http://support.ca.com/ CA20090126-01: Security Notice for CA Anti-Virus Engine https://support.ca.com/irj/portal/anonymous/phpsupcontent?contentID=1976 01 Solution Document Reference APARs: RO05417, RO05418, RO01955, RO05629, RO05309, RO05868, RO05631, RO01956, RO01959 CA Security Response Blog posting: CA20090126-01: CA Anti-Virus Engine Detection Evasion Multiple Vulnerabilities community.ca.com/blogs/casecurityresponseblog/archive/2009/05/12.aspx Reported By: Thierry Zoller and Sergio Alvarez of n.runs AG http://www.nruns.com/ http://secdev.zoller.lu CVE References: CVE-2009-0042 - Anti-Virus detection evasion http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2009-0042 OSVDB References: OSVDB ID 53604 http://osvdb.org/53604 Changelog for this advisory: v1.0 - Initial Release v1.1 - Updated list of affected products, and added solutions. v1.2 - Added CA ARCserve patch solution. v1.3 - Updated CA ARCserve patch solution. Customers who require additional information should contact CA Technical Support at http://support.ca.com. For technical questions or comments related to this advisory, please send email to vuln AT ca DOT com. If you discover a vulnerability in CA products, please report your findings to the CA Product Vulnerability Response Team. https://support.ca.com/irj/portal/anonymous/phpsupcontent?contentID=1777 82 Regards, Ken Williams, Director ; 0xE2941985 CA Product Vulnerability Response Team CA, 1 CA Plaza, Islandia, NY 11749 Contact http://www.ca.com/us/contact/ Legal Notice http://www.ca.com/us/legal/ Privacy Policy http://www.ca.com/us/privacy/ Copyright (c) 2009 CA. All rights reserved.