Secunia Research: ALZip ACE Archive Handling Buffer Overflow

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                 Secunia Research 07/09/2005

       - ALZip ACE 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

ALZip v6.11 (Korean) (And all prior Korean versions)
ALZip v5.52 (All language versions)
ALZip v5.51 (All language versions)
ALZip v6.03 (English)
ALZip v6.1 beta

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2) Severity

Rating: Moderately Critical
Impact: System access
Where: Remote

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3) Description of Vulnerability

Secunia Research has discovered a vulnerability in ALZip, which can
be exploited by malicious people to compromise a vulnerable system.

The vulnerability is caused due to a boundary error in UNACEV2.DLL
when extracting an ACE archive containing a file with an overly long
filename and can cause a stack-based buffer overflow. This can be
exploited to execute arbitrary code when the user extracts a
specially crafted ACE archive.

The vulnerability is related to:
http://secunia.com/SA14359

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4) Solution

Update to the fixed versions.

International Versions:
Update to version 6.1

Korean Version:
Update to version 6.12

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5) Time Table

22/08/2005 - Initial vendor notification.
22/08/2005 - Initial vendor reply.
05/09/2005 - Notified by vendor that fixed versions have been
released.
07/09/2005 - Public disclosure.

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6) Credits

Discovered by Tan Chew Keong, Secunia Research.

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7) References

No references available.

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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/2005-41/advisory/

Complete list of vulnerability reports published by Secunia Research:
http://secunia.com/secunia_research/

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