TITLE:
Clam AntiVirus OLE2 Unpacker Potential Denial of Service

SECUNIA ADVISORY ID:
SA17184

VERIFY ADVISORY:
http://secunia.com/advisories/17184/

CRITICAL:
Less critical

IMPACT:
DoS

WHERE:
>From remote

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

DESCRIPTION:
Marcin Owsiany has discovered a vulnerability in Clam AntiVirus,
which potentially can be exploited by malicious people to cause a DoS
(Denial of Service).

The vulnerability is caused due to an error in handling malformed
OLE2 files (e.g. DOC files). This can be exploited to crash "clamd"
via a specially crafted DOC file that causes "clamd" to call the
"ole2_walk_property_tree()" function recursively.

Successful exploitation causes a DoS (e.g. if "clamd" is used by an
email gateway), but requires that "clamd" is configured with a large
value (e.g. > 10000) for the ArchiveMaxFiles option.

The vulnerability has been confirmed in version 0.87. Other versions
may also be affected.

SOLUTION:
Do not configure a large value for the ArchiveMaxFiles option.

PROVIDED AND/OR DISCOVERED BY:
Marcin Owsiany

ORIGINAL ADVISORY:
Debian:
http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=333566

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