[SA21374] Clam AntiVirus pefromupx() Buffer Overflow Vulnerability

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TITLE:
Clam AntiVirus pefromupx() Buffer Overflow Vulnerability

SECUNIA ADVISORY ID:
SA21374

VERIFY ADVISORY:
http://secunia.com/advisories/21374/

CRITICAL:
Highly critical

IMPACT:
DoS, System access

WHERE:
>From remote

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

DESCRIPTION:
Damian Put has discovered a vulnerability in Clam AntiVirus, which
can be exploited by malicious people to cause a DoS (Denial of
Service) and potentially compromise a vulnerable system.

The vulnerability is caused due to an boundary error in the
"pefromupx()" function in libclamav/upx.c when unpacking PE
executable files compressed with UPX. This can be exploited to cause
a heap-based buffer overflow via a specially crafted UPX compressed
file.

Successful exploitation crashes the service and may allow execution
of arbitrary code.

The vulnerability has been confirmed in versions 0.88.2 and 0.88.3.
Other versions may also be affected.

SOLUTION:
Disable the "ScanPE" option for clamd and start clamscan with the
"–no-pe" option. Please note that this completely disables the
scanning of PE files. Then block or filter PE files in some other
way.

PROVIDED AND/OR DISCOVERED BY:
Damian Put

ORIGINAL ADVISORY:
http://www.overflow.pl/adv/clamav_upx_heap.txt

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