Technical Description

Multiple vulnerabilities have been identified in Clam AntiVirus (ClamAV), which could be exploited by attackers or malware to cause a denial of service or execute arbitrary code.

The first issue is caused by NULL-pointer dereference errors in the "cli_scanrtf()" [libclamav/rtf.c] and "cli_html_normalise()" [libclamav/htmlnorm.c] when processing malformed RTF or HTML files, which could be exploited by attackers to crash an affected application, creating a denial of service condition.

The second vulnerability is caused by an error in the processing of recipient addresses read from email messages, which could be exploited by attackers to inject and execute arbitrary code with the privileges of clamav-milter when a specially crafted recipient address is passed to "popen()".

Affected Products

Clam AntiVirus (ClamAV) version 0.91.1 and prior

Solution

Upgrade to version 0.91.2 :
http://sourceforge.net/projects/clamav/

References

http://www.vupen.com/english/advisories/2007/2952
http://sourceforge.net/project/shownotes.php?release_id=533658&group_id=86638
https://wwws.clamav.net/bugzilla/show_bug.cgi?id=582
https://wwws.clamav.net/bugzilla/show_bug.cgi?id=611
http://www.nruns.com/security_advisory_clamav_remote_code_exection.php

Credits

Vulnerabilities reported by the vendor, Stefanos Stamatis and Nikolaos Rangos (n.runs AG).

ChangeLog

2007-08-23 : Initial release
2007-09-02 : Updated Description

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