CA20090126-01: CA Anti-Virus Engine Detection Evasion Multiple Vulnerabilities Jan 27 2009 03:08PM
Williams, James K (James Williams ca com)
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 installed

Affected Platforms:
Mac OS X

Status and Recommendation:
CA released arclib 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:

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

*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, the
installation is vulnerable.

Example compver utility output:
eTrust Antivirus Arclib Archive Library
... (followed by other components)

For reference, the following are file names for arclib on
non-Windows operating systems:

Operating System File name
Mac OS X arclib.bundle

Do not open email attachments or download files from untrusted

References (URLs may wrap):
CA Support:
CA20090126-01: Security Notice for CA Anti-Virus Engine

Solution Document Reference APARs:
CA Security Response Blog posting:
CA20090126-01: CA Anti-Virus Engine Detection Evasion Multiple
Reported By:
Thierry Zoller and Sergio Alvarez of n.runs AG
CVE References:
CVE-2009-0042 - Anti-Virus detection evasion
OSVDB References: Pending

Changelog for this advisory:
v1.0 - Initial Release

Customers who require additional information should contact CA
Technical Support at

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.


Ken Williams, Director ; 0xE2941985
CA Product Vulnerability Response Team

CA, 1 CA Plaza, Islandia, NY 11749

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