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TITLE:
avast! LHA Archive Processing Buffer Overflow Vulnerability

SECUNIA ADVISORY ID:
SA21794

VERIFY ADVISORY:
http://secunia.com/advisories/21794/

CRITICAL:
Highly critical

IMPACT:
System access

WHERE:
>From remote

SOFTWARE:
avast! Home/Professional 4.x
http://secunia.com/product/5162/
avast! Server Edition 4.x
http://secunia.com/product/11895/

DESCRIPTION:
Ryan Smith has reported a vulnerability in avast!, which can be
exploited by malicious people to compromise a vulnerable system.

The vulnerability is caused due to a boundary error in the anti-virus
engine when processing LHA archives. This can be exploited to cause a
heap-based buffer overflow via a specially crafted LHA archive with
overly long filename and directory name extended-header fields.

Successful exploitation allows execution of arbitrary code.

The vulnerability is reported in the anti-virus engine prior to
versions 4.7.869 for desktops and 4.7.660 for servers.

SOLUTION:
Update to a fixed version.

PROVIDED AND/OR DISCOVERED BY:
Ryan Smith

ORIGINAL ADVISORY:
http://www.hustlelabs.com/advisories/04072006_alwil.pdf

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