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>> Bogofilter Unicode Database and Bogolexer Denial of Service Issues

Title : Bogofilter Unicode Database and Bogolexer Denial of Service Issues
VUPEN ID : VUPEN/ADV-2006-0100
CVE ID : CVE-2005-4591 - CVE-2005-4592
Rated as : Moderate Risk 
Remotely Exploitable : Yes
Locally Exploitable : Yes
Release Date : 2006-01-09


Technical Description    Receive VUPEN Security alerts in a Text format  Receive VUPEN Security alerts in a PDF format  Receive VUPEN Security alerts in an XML format  Receive VUPEN Security notifications by SMS 

Two vulnerabilities were identified in Bogofilter, which could be exploited by attackers to cause a denial of service.

The first issue is due to a heap overflow error in bogofilter and bogolexer (if used with an unicode database) when converting character sets, which could be exploited by attackers to crash a vulnerable server by sending an email containing a specially crafted binary attachment.

The second flaw is due to a heap overflow error in bogofilter and bogolexer when processing inputs containing overly long words (more than 16,384 bytes), which could be exploited to cause a denial of service.

Affected Products

Bogofilter version 0.96.2 (stable)
Bogofilter version 0.95.2 (stable)
Bogofilter version 0.94.14 (stable)
Bogofilter version 0.94.12 (stable)
Bogofilter versions 0.93.5 through 0.96.2 (current)

Solution

Upgrade to Bogofilter version 0.96.3, 0.96.6, or 1.0.0 :
https://sourceforge.net/projects/bogofilter/

References

http://www.vupen.com/english/advisories/2006/0100
http://bogofilter.sourceforge.net/security/bogofilter-SA-2005-01
http://bogofilter.sourceforge.net/security/bogofilter-SA-2005-02

Credits

Vulnerabilities reported by David Relson and Clint Adams

ChangeLog

2006-01-09 : Initial release

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