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Secunia Research 11/10/2005
- WinRAR Format String and Buffer Overflow Vulnerabilities -
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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
WinRAR 3.50
Prior 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 two vulnerabilities in WinRAR, which
can be exploited by malicious people to compromise a user's system.
1) A format string error exists when displaying a diagnostic error
message that informs the user of an invalid filename in an UUE/XXE
encoded file. This can be exploited to execute arbitrary code when a
malicious UUE/XXE file is decoded.
2) A boundary error in UNACEV2.DLL can be exploited to cause a
stack-based buffer overflow. This allows arbitrary code execution when
a malicious ACE archive containing a file with an overly long file
name is extracted.
Vulnerability #2 is related to:
http://secunia.com/SA14359
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4) Solution
Update to version 3.51.
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5) Time Table
30/09/2005 - Initial vendor notification.
30/09/2005 - Initial vendor reply.
10/10/2005 - Vendor released fixed version.
11/10/2005 - Public disclosure.
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6) Credits
Discovered by Tan Chew Keong, Secunia Research.
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7) References
RARLAB:
http://www.rarlabs.com/rarnew.htm
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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/2005-53/advisory/
Complete list of vulnerability reports published by Secunia Research:
http://secunia.com/secunia_research/
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