[Full-disclosure] CA20090126-01: CA Anti-Virus Engine Detection Evasion Multiple Vulnerabilities

From: Williams, James K <James.Williams_at_nospam>
Date: Tue Jan 27 2009 - 15:08:54 GMT
To: <full-disclosure@lists.grok.org.uk>

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Title: CA20090126-01: CA Anti-Virus Engine Detection Evasion Multiple Vulnerabilities

CA Advisory Reference: CA20090126-01

CA Advisory Date: 2009-01-26

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 r7, r6.1
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 Protection Suites r2, r3, r3.1
CA Secure Content Manager (formerly eTrust Secure Content

Manager) 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 client agent for Windows
CA eTrust Intrusion Detection 2.0 SP1, 3.0, 3.0 SP1, 4.0 CA Common Services (CCS) 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.

How to determine if you are affected:

For products on Windows:

Using Windows Explorer, locate the file "arclib.dll". By default, the file is located in the "C:\Program Files\CA\SharedComponents\ScanEngine" directory (*).
Right click on the file and select Properties.
Select the Version tab.
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:
n/a
CA Security Response Blog posting:
CA20090126-01: CA Anti-Virus Engine Detection Evasion Multiple Vulnerabilities
community.ca.com/blogs/casecurityresponseblog/archive/2009/01/26.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: Pending
http://osvdb.org/

Changelog for this advisory:
v1.0 - Initial Release

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

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