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

----------------------------------------------------------------------

About:
This Advisory was delivered by Secunia as a free service to help
everybody keeping their systems up to date against the latest
vulnerabilities.

Subscribe:
http://secunia.com/secunia_security_advisories/

Definitions: (Criticality, Where etc.)
http://secunia.com/about_secunia_advisories/


Please Note:
Secunia recommends that you verify all advisories you receive by
clicking the link.
Secunia NEVER sends attached files with advisories.
Secunia does not advise people to install third party patches, only
use those supplied by the vendor.

----------------------------------------------------------------------

Unsubscribe: Secunia Security Advisories
http://secunia.com/sec_adv_unsubscribe/?email=packet%40packetstormsecurity.org

----------------------------------------------------------------------