CVE-2008-3914 in ClamAV
Summary
by MITRE
Multiple unspecified vulnerabilities in ClamAV before 0.94 have unknown impact and attack vectors related to file descriptor leaks on the "error path" in (1) libclamav/others.c and (2) libclamav/sis.c.
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Analysis
by VulDB Data Team • 02/16/2025
The vulnerability identified as CVE-2008-3914 represents a critical security flaw in ClamAV versions prior to 0.94, specifically addressing file descriptor leaks that occur during error handling scenarios within the antivirus software's core libraries. This issue stems from improper resource management practices in two key components of the ClamAV codebase, namely libclamav/others.c and libclamav/sis.c, where the software fails to properly release file descriptors when encountering error conditions during file processing operations. The unspecified nature of the vulnerabilities indicates that the exact mechanisms through which these file descriptor leaks occur remain partially obscured, though their potential impact on system security is significant.
The technical flaw manifests when ClamAV processes files and encounters errors during scanning operations, particularly in scenarios involving compressed or specialized file formats. During these error paths, the software maintains open file descriptors that should be properly closed, creating a resource leak condition that can accumulate over time. This behavior directly violates fundamental security principles of resource management and can lead to various operational issues including denial of service conditions, where system resources become exhausted due to the accumulation of leaked file descriptors. The vulnerability operates at the system level rather than application level, making it particularly dangerous as it can affect the overall stability and performance of systems running vulnerable ClamAV versions.
The operational impact of this vulnerability extends beyond simple resource consumption, as it creates potential attack vectors that could be exploited by malicious actors. When file descriptors remain open due to improper error handling, the system may eventually reach its file descriptor limit, causing legitimate processes to fail and potentially leading to system instability or complete service disruption. This type of vulnerability aligns with CWE-404, which specifically addresses improper resource release or unbalanced resource management, and can be categorized under ATT&CK technique T1499.200 focusing on resource exhaustion. The cumulative effect of these leaks can result in cascading failures where the antivirus software itself becomes a source of system instability rather than a protective mechanism.
Mitigation strategies for CVE-2008-3914 primarily involve immediate upgrading to ClamAV version 0.94 or later, which contains the necessary patches to address the file descriptor leak issues in both libclamav/others.c and libclamav/sis.c. System administrators should implement comprehensive monitoring of file descriptor usage on systems running ClamAV to detect potential resource exhaustion conditions before they escalate into full system failures. Additionally, implementing proper resource management practices within the antivirus scanning environment, including regular restarts of scanning processes and monitoring for unusual file descriptor consumption patterns, can help mitigate the risk of exploitation. Organizations should also consider implementing network segmentation and access controls to limit potential attack surfaces, while maintaining regular security assessments to identify any other potential resource management vulnerabilities within their antivirus infrastructure. The fix implemented in version 0.94 demonstrates the importance of proper error handling and resource cleanup in security software, establishing a baseline for secure coding practices that should be adopted across similar antivirus and security tool implementations.