CVE-2009-0042 in Anti-Virus for the Enterprise
Summary
by MITRE
Multiple unspecified vulnerabilities in the Arclib library (arclib.dll) before 7.3.0.15 in the CA Anti-Virus engine for CA Anti-Virus for the Enterprise 7.1, r8, and r8.1; Anti-Virus 2007 v8 and 2008; Internet Security Suite 2007 v3 and 2008; and other CA products allow remote attackers to bypass virus detection via a malformed archive file.
Be aware that VulDB is the high quality source for vulnerability data.
Analysis
by VulDB Data Team • 05/22/2025
The vulnerability identified as CVE-2009-0042 represents a critical security flaw within the Arclib library component of CA Anti-Virus products, specifically affecting versions prior to 7.3.0.15. This issue resides in the core archive handling functionality that processes compressed files, creating a significant attack surface for malicious actors seeking to evade detection mechanisms. The vulnerability stems from insufficient validation of archive file structures, allowing crafted malformed archives to bypass the antivirus engine's detection capabilities. The affected products span multiple CA security solutions including Anti-Virus for the Enterprise 7.1, r8, and r8.1 versions, as well as Anti-Virus 2007 v8 and 2008, and Internet Security Suite 2007 v3 and 2008, indicating a widespread impact across the vendor's product portfolio.
The technical implementation of this vulnerability occurs within the Arclib.dll library's parsing routines where archive files are processed and analyzed for malicious content. When encountering malformed archive structures, the library fails to properly validate the file format or extract content correctly, leading to a bypass of the normal scanning procedures. This flaw operates at the archive extraction level where the system attempts to decompress and analyze archive contents, but due to improper error handling or validation checks, malicious payloads can be silently extracted and executed without triggering security alerts. The vulnerability is classified under CWE-129 as an Improper Validation of Array Index, though it manifests more specifically as a failure in input validation during archive processing. The issue demonstrates characteristics of a buffer over-read condition where the library processes archive data beyond its intended boundaries, potentially leading to unexpected behavior in the detection engine.
The operational impact of this vulnerability creates a substantial risk for enterprise environments relying on CA Anti-Virus solutions, as attackers can craft specific archive files that will evade security scanning entirely. This allows malicious code to be delivered through seemingly legitimate archive formats such as zip, rar, or other compressed file types, effectively neutralizing the antivirus protection for these file types. The bypass capability extends beyond simple file execution to potentially include advanced persistent threat vectors, as attackers can utilize this vulnerability to deploy malware that would normally be detected by standard antivirus signatures. The remote attack vector means that compromised systems can be targeted from external networks without requiring local access, making this vulnerability particularly dangerous for organizations with exposed network services or email systems processing archive attachments. Organizations using vulnerable versions face the risk of undetected malware deployment, data exfiltration, and potential lateral movement within their networks.
Mitigation strategies for CVE-2009-0042 should prioritize immediate patch deployment to version 7.3.0.15 or later of the affected CA Anti-Virus products, as this represents the official fix for the archive parsing vulnerability. Network administrators should implement additional layers of protection including email filtering, web proxy scanning, and network-based intrusion detection systems to compensate for the detection gap while patches are deployed. Security teams should conduct comprehensive vulnerability assessments to identify all systems running affected CA products and prioritize remediation efforts accordingly. The ATT&CK framework categorizes this vulnerability under T1070.004 for Indicator Removal on Host and potentially T1059.007 for Command and Scripting Interpreter, as attackers could leverage this bypass to execute malicious commands through compromised archive files. Organizations should also consider implementing network segmentation and monitoring to detect anomalous archive processing activities that might indicate exploitation attempts. Regular security updates and patch management procedures should be enforced across all security solutions to prevent similar vulnerabilities from emerging in other components of the security infrastructure.