unzoo.c, as used in multiple products including AMaViS 2.4.1 and earlier, allows remote attackers to cause a denial of service (infinite loop) via a ZOO archive with a direntry structure that points to a previous file.
CVSS Severity (version 2.0):
Impact Subscore: 6.9
Exploitability Subscore: 10.0
CVSS Version 2 Metrics:
Access Vector: Network exploitable
Access Complexity: Low
Authentication: Not required to exploit
Impact Type: Allows disruption of service
For Barracuda Spam Firewall:
Upgrade to the latest virus definition version of Barracuda Spam Firewall (virusdef 2.0.6399 for 3.4 and after or virusdef 2.0.6399o for prior to 3.4), available from the automatic update.
For Panda Software Antivirus:
Upgrade to the latest version of Panda Software Antivirus (4/2/2007 or later), available from the automatic update feature.
For avast! antivirus:
Upgrade to the latest version of Panda Software Antivirus (4.7.981 or later), available from the avast! antivirus Web site. See references.
For Avira AntiVir:
Upgrade to the latest version of Avira AntiVir (avpack32.dll version 126.96.36.199 or later), available from the automatic update feature.
Refer to ASA-2007-2 for patch, upgrade, or suggested workaround information. See References.
References to Advisories, Solutions, and Tools
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20070504 Multiple vendors ZOO file decompression infinite loop DoS