iDEFENSE Security Advisory 10.18.04: Multiple Vendor Anti-Virus Software Detection Evasion Vulnerability. Multiple anti-virus vendors including McAfee, Computer Associates, Kaspersky, Sophos, Eset and RAV are affected. The problem specifically exists in the parsing of .zip archive headers. It is possible to modify the uncompressed size of archived files in both the local and global header without affecting functionality. An attacker can compress a malicious payload and evade detection by some anti-virus software by modifying the uncompressed size within the local and global headers to zero.
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