Amavis file Integer Underflow and Denial of Service
Secunia Advisory: SA25578
Release Date: 2007-06-06
Popularity: 3,423 views

Critical:
Highly critical
Impact: DoS
System access
Where: From remote
Solution Status: Partial Fix

Software:AMaViS (A Mail Virus Scanner) 0.x
amavisd-new 2.x

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CVE reference:CVE-2007-2026
CVE-2007-2799


Description:
A vulnerability and a security issue have been reported in Amavis, which can be exploited by malicious people to cause a DoS (Denial of Service) or potentially to compromise a vulnerable system.

1) An integer underflow error in the "file" utility can be exploited to cause a heap-based buffer overflow.

For more information:
SA24548

2) The problem is caused due to certain regular expressions in "file", which can consume all available CPU resources when identifying a specially crafted file.

For more information:
SA24918

Solution:
The vendor recommends updating to file version 4.21 or later and editing the "magic" file (see vendor advisory for details).

Provided and/or discovered by:
Reported by the vendor.

Original Advisory:
http://www.amavis.org/security/asa-2007-3.txt

Other References:
SA24548:
http://secunia.com/advisories/24548/

SA24918:
http://secunia.com/advisories/24918/


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