Secunia Research: AhnLab V3 Antivirus ALZ/UUE/XXE Archive Handling Buffer Overflow
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Secunia Research 13/10/2005
- AhnLab V3 Antivirus ALZ/UUE/XXE Archive Handling Buffer Overflow -
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Table of Contents
Affected Software....................................................1
Severity.............................................................2
Description of Vulnerability.........................................3
Solution.............................................................4
Time Table...........................................................5
Credits..............................................................6
References...........................................................7
About Secunia........................................................8
Verification.........................................................9
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1) Affected Software
AhnLab V3Pro 2004 (V3 VirusBlock 2005 international) (Build 6.0.0.457)
AhnLab V3Net for Windows Server 6.0 (Build 6.0.0.457)
AhnLab MyV3 with AzMain.dll 1.3.11.15
Prior versions may also be affected.
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2) Severity
Rating: Highly critical
Impact: System access
Where: Remote
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3) Description of Vulnerability
Secunia Research has discovered a vulnerability in AhnLab V3
Antivirus, which can be exploited by malicious people to compromise
a vulnerable system.
The vulnerability is caused due to a boundary error in the archive
decompression library when reading the filename of a compressed file
from an ALZ, UUE or XXE archive. This can be exploited to cause a
stack-based buffer overflow (ALZ), or a heap-based buffer overflow
(UUE/XXE), when a malicious ALZ/UUE/XXE archive is scanned.
Successful exploitation allows arbitrary code execution, but requires
that compressed file scanning is enabled.
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4) Solution
AhnLab V3Pro 2004 (V3 VirusBlock 2005 international):
Update to version 6.0.0.488 via Smart Update.
AhnLab V3Net for Windows Server 6.0:
Update to version 6.0.0.488 via Smart Update.
AhnLab MyV3:
The vulnerability has reportedly been fixed in the vendor's Korean
MyV3 website.
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5) Time Table
19/09/2005 - Initial vendor notification.
20/09/2005 - Initial vendor response.
13/10/2005 - Vendor releases advisory.
13/10/2005 - Public disclosure.
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6) Credits
Discovered by Tan Chew Keong, Secunia Research.
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7) References
AhnLab:
http://global.ahnlab.com/security/security_advisory002.html
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8) About Secunia
Secunia collects, validates, assesses, and writes advisories regarding
all the latest software vulnerabilities disclosed to the public. These
advisories are gathered in a publicly available database at the
Secunia website:
http://secunia.com/
Secunia offers services to our customers enabling them to receive all
relevant vulnerability information to their specific system
configuration.
Secunia offers a FREE mailing list called Secunia Security Advisories:
http://secunia.com/secunia_security_advisories/
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9) Verification
Please verify this advisory by visiting the Secunia website:
http://secunia.com/secunia_research/2005-48/advisory/
Complete list of vulnerability reports published by Secunia Research:
http://secunia.com/secunia_research/
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