Two vulnerabilities were identified in Avast! Antivirus, which could be exploited by attackers to execute arbitrary commands and compromise a vulnerable system.
The first issue is due to an input validation error in a 3rd-party compression library (UNACEV2.DLL) when extracting ACE archives for scanning, which can be exploited to write files to arbitrary directories when scanning a malicious archive containing a file with the "/../" directory traversal sequence or an absolute path in its filename.
The second vulnerability is due to a stack overflow error in "UNACEV2.DLL" when scanning a malicious ACE archive containing a file that has a filename of more than 290 bytes, which could be exploited to execute arbitrary commands.
Credits
Vulnerability reported by Tan Chew Keong
ChangeLog
2005-07-21 : Initial release
Vulnerability Management
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