CVE-2008-0728 in ClamAV
Summary
by MITRE
The unmew11 function in libclamav/mew.c in libclamav in ClamAV before 0.92.1 has unknown impact and attack vectors that trigger "heap corruption."
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Analysis
by VulDB Data Team • 03/22/2025
The vulnerability identified as CVE-2008-0728 represents a critical heap corruption issue within the ClamAV antivirus engine's libclamav library. This flaw exists in the unmew11 function located in the libclamav/mew.c source file, which forms part of the email message processing capabilities of the ClamAV scanning system. The vulnerability's classification as having "unknown impact and attack vectors" suggests that the specific exploitation mechanisms and consequences were not fully understood at the time of discovery, creating significant uncertainty for security professionals and system administrators.
The technical nature of this heap corruption vulnerability stems from improper memory management within the email message parsing functionality of ClamAV. When processing certain malformed email messages, the unmew11 function fails to properly handle memory allocation and deallocation operations, leading to memory corruption that can potentially result in arbitrary code execution or system instability. This type of vulnerability falls under the broader category of memory safety issues commonly classified as CWE-122 (Heap Overflow) or similar heap-based memory corruption patterns. The heap corruption occurs during the processing of email headers and content, particularly when handling specific message structures that trigger unexpected memory behavior.
The operational impact of this vulnerability extends beyond simple system crashes or instability, as it represents a potential remote code execution vector that could be exploited by malicious actors. Attackers could craft specially formatted email messages designed to trigger the heap corruption when processed by vulnerable ClamAV installations, potentially leading to complete system compromise. This threat is particularly concerning given that ClamAV is widely deployed across enterprise environments and email servers, making the vulnerability exploitable at scale. The lack of specific attack vector information at the time of discovery indicates that the vulnerability's exploitation methods were not well-documented, requiring extensive analysis and testing to understand the full scope of potential threats.
Mitigation strategies for CVE-2008-0728 primarily focus on immediate patching of affected ClamAV installations to version 0.92.1 or later, which contains the necessary memory management fixes. Organizations should also implement network-level protections such as email filtering and content inspection to reduce exposure to potentially malicious email traffic. The vulnerability's classification as a heap corruption issue aligns with ATT&CK techniques related to code injection and privilege escalation, making it particularly dangerous in environments where ClamAV is used as a security control. Security teams should conduct thorough vulnerability assessments to identify all systems running vulnerable versions of ClamAV and ensure proper patch management protocols are in place to prevent exploitation attempts.