[SA19880] ClamAV Freshclam HTTP Header Buffer Overflow Vulnerability

TITLE:
ClamAV Freshclam HTTP Header Buffer Overflow Vulnerability

SECUNIA ADVISORY ID:
SA19880

VERIFY ADVISORY:
http://secunia.com/advisories/19880/

CRITICAL:
Moderately critical

IMPACT:
DoS, System access

WHERE:
>From remote

SOFTWARE:
Clam AntiVirus (clamav) 0.x
http://secunia.com/product/2538/

DESCRIPTION:
A vulnerability has been reported in ClamAV, which can be exploited
by malicious people to cause a DoS (Denial of Service) and
potentially to compromise a vulnerable system.

The vulnerability is caused due to a boundary error within the HTTP
client in the Freshclam command line utility. This can be exploited
to cause a stack-based buffer overflow when the HTTP headers received
from a web server exceeds 8KB.

Successful exploitation requires that Freshclam is used to download
virus signature updates from a malicious mirror web server e.g. via
DNS poisoning.

The vulnerability has been reported in version 0.80 through 0.88.1.

SOLUTION:
Update to version 0.88.2.
http://sourceforge.net/project/showfiles.php?group_id=86638&release_id=407078

PROVIDED AND/OR DISCOVERED BY:
The vendor credits Ulf Harnhammar and anonymous researcher from
Germany.

ORIGINAL ADVISORY:
http://www.clamav.net/security/0.88.2.html
http://www.clamav.net/doc/0.88.2/ChangeLog

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