iDefense Security Advisory 12.08.06 - Remote exploitation of a denial of service vulnerability in Multiple Vendors' Antivirus engines allows an attacker to cause the engines to consume excessive resources. The affected vendors' scan engines are vulnerable to a DoS attack when scanning specially malformed RAR archives. Specifically, the malformed archives will have the head_size and pack_size fields set to zero in Archive Header section. When such a file is encountered, the affected scan engines will enter an infinite loop. Confirmed systems affected: Sophos Small business edition (Windows/Linux) 4.06.1 with engine version 2.34.3. Trend Micro PC Cillin - Internet Security 2006. Trend Micro Office Scan 7.3. Trend Micro Server Protect 5.58.
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