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Secunia Research 23/09/2005
- 7-Zip ARJ 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
7-Zip Version 3.13, 4.23, and 4.26 BETA
Other versions may also be affected.
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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 7-Zip, which can
be exploited by malicious people to compromise a user's system.
The vulnerability is caused due to a boundary error when handling an
ARJ block that is larger than 2600 bytes. This can be exploited to
cause a stack-based buffer overflow when a specially crafted ARJ file
is opened.
Successful exploitation allows arbitrary code execution.
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4) Solution
The vulnerability has been fixed in version 4.27 BETA.
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5) Time Table
05/09/2005 - Initial vendor notification.
05/09/2005 - Initial vendor reply.
21/09/2005 - Vendor released fixed version.
23/09/2005 - 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/2005-45/advisory/
Complete list of vulnerability reports published by Secunia Research:
http://secunia.com/secunia_research/
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