Technical Description

Multiple vulnerabilities have been identified in ClamAV, which could be exploited by remote attackers or malware to cause a denial of service or take complete control of an affected system.

The first issue is caused by an integer overflow error within the "cli_scanpe()" [libclamav/pe.c] function when parsing PE files packed with the MEW packer, which could be exploited by attackers to execute arbitrary commands by tricking a vulnerable application into scanning a specially crafted file.

The second vulnerability is caused by an off-by-one buffer overflow error in the MS-ZIP decompression code, which could be exploited to crash a vulnerable application or execute arbitrary code.

The third issue is caused by an unspecified bzlib error.

Affected Products

ClamAV versions prior to 0.92

Solution

Upgrade to ClamAV version 0.92 :
http://sourceforge.net/projects/clamav/

References

http://www.vupen.com/english/advisories/2007/4253
http://sourceforge.net/project/shownotes.php?release_id=562254
http://labs.idefense.com/intelligence/vulnerabilities/display.php?id=634

Credits

Vulnerabilities reported by iDefense Labs and the vendor.

ChangeLog

2007-12-19 : Initial release
2007-12-20 : Updated Description

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