Damian Put discovered a vulnerability in the ClamAV anti-virus toolkit's parsing of Petite-packed Win32 executables. The weakness leads to an invalid memory access, and could enable an attacker to crash clamav by supplying a maliciously crafted Petite-compressed binary for scanning. In some configurations, such as when clamav is used in combination with mail servers, this could cause a system to fail open, facilitating a follow-on viral attack.
A previous version of this advisory referenced packages that were built incorrectly and omitted the intended correction. This issue was fixed in packages referenced by the -2 revision of the advisory.
For the stable distribution (etch), this problem has been fixed in version 0.90.1dfsg-3.1+etch14.
For the unstable distribution (sid), this problem has been fixed in version 0.93.1.dfsg-1.1.
We recommend that you upgrade your clamav packages.