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TITLE:
Ahnlab V3 Antivirus Multiple Vulnerabilities

SECUNIA ADVISORY ID:
SA15674

VERIFY ADVISORY:
http://secunia.com/advisories/15674/

CRITICAL:
Highly critical

IMPACT:
Security Bypass, Privilege escalation, System access

WHERE:
>From remote

SOFTWARE:
AhnLab V3 VirusBlock 2005
http://secunia.com/product/5701/
AhnLab V3Net for Windows Server 6.x
http://secunia.com/product/5700/
AhnLab V3Pro
http://secunia.com/product/5699/

DESCRIPTION:
Secunia research has discovered some vulnerabilities in AhnLab V3
Antivirus, which can be exploited by malicious, local users to gain
escalated privileges, or by malicious people to compromise a
vulnerable system.

1) The real-time scan driver, v3flt2k.sys, does not validate the
source of received "DeviceIoControl()" commands. This can be
exploited by non-administrative users to run explorer.exe with SYSTEM
privileges, or to disable the real-time scan engine, via specially
crafted DeviceIoControl requests,

2) A boundary error in the ACE archive decompression library can be
exploited to cause a stack-based buffer overflow when a malicious ACE
archive containing a compressed file with an overly long filename is
scanned.

Successful exploitation allows execution of arbitrary code, but
requires that compressed file scanning is enabled.

3) A directory traversal error in the archive decompression library
can be exploited to write files to arbitrary directories when a
malicious archive containing compressed files with directory
traversal sequences in their filenames is scanned.

Vulnerability #2 and #3 are related to:
SA14359

The vulnerabilities have been confirmed in the following products:
* AhnLab V3Pro 2004 (Build 6.0.0.383)
* AhnLab V3 VirusBlock 2005 (Build 6.0.0.383)
* AhnLab V3Net for Windows Server 6.0 (Build 6.0.0.383)

SOLUTION:
Update to version 6.0.0.457 via online update.

PROVIDED AND/OR DISCOVERED BY:
Tan Chew Keong, Secunia Research

ORIGINAL ADVISORY:
AhnLab:
http://info.ahnlab.com/english/advisory/01.html

Secunia Research:
http://secunia.com/secunia_research/2005-17/advisory/

OTHER REFERENCES:
SA14359:
http://secunia.com/advisories/14359/

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


Please Note:
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