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Clam AntiVirus Realtime Scanning VirusEvent Security Issue
Secunia Advisory: SA11253
Release Date: 2004-03-31
Popularity: 12,046 views

Critical:
Not critical
Impact: Privilege escalation
Where: From local network
Solution Status: Unpatched

Software:Clam AntiVirus (clamav) 0.x

Secunia CVSS-2 Score: Available in Secunia business solutions

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Advisory Content (Page 1 of 3)[ 1 ] [ 2 ] [ 3 ]

Description:
l0om has reported a security issue in Clam AntiVirus, which potentially can be exploited by malicious, local users to gain escalated privileges.

An administrative user can use the "VirusEvent" directive in "clamav.conf" to create events for the realtime scanner, which allows a specified command to be executed when a virus is detected. A "VirusEvent" may include the "%v" and "%f" specifiers, which will be substituted with the virus name and infected filename.

The problem is that no validation is performed on the infected filename before it is included and passed to the "system()" function. This can be exploited to execute arbitrary commands with the privileges of Clam AntiVirus by including these and shell meta-characters as the name of an infected file.

NOTE: No VirusEvents are defined by default and users are warned about using the "%f" specifier.

Change Page:
[ 1 ] [ 2 ] [ 3 ]



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