Yahoo! Messenger Lets Remote Users Spoof Filenames During File Transfer
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SecurityTracker Alert ID: 1013237
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SecurityTracker URL: http://securitytracker.com/id?1013237
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CVE Reference: CAN-2005-0243
(Links to External Site)
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Date: Feb 18 2005
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Impact: Modification of system information
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Fix Available: Yes
Exploit Included: Yes
Vendor Confirmed: Yes
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Advisory: Secunia Research
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Version(s): 6.0.0.1750; previous versions may also be affected
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Description: A vulnerability was reported in Yahoo! Messenger in the file transfer feature. A remote user may be able to cause a target user to execute arbitrary code.
Yahoo! Messenger does not properly display files with long filenames in the file transfer dialog windows. A remote user can send
a specially crafted, long filename containing whitespace and two file extensions to spoof the filename.
If the target user's
Windows configuration is set to hide file extensions for known file types, and if the target user executes the file, arbitrary code
may be executed with the privileges of the target user.
The vendor was notified on January 10, 2005.
Andreas Sandblad of Secunia
Research discovered this vulnerability.
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Impact: A remote user can spoof filenames of files being transferred.
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Solution: The vendor has released a fixed version (6.0.0.1921), available at:
http://messenger.yahoo.com/
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Vendor URL: messenger.yahoo.com/ (Links to External Site)
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Cause: State error
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Underlying OS: Windows (Any)
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Reported By: Andreas Sandblad <as@secunia.com>
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Message History:
None.
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Source Message Contents
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Date: Fri, 18 Feb 2005 14:59:52 +0100
From: Andreas Sandblad <as@secunia.com>
Subject: [Full-Disclosure] Secunia Research: Yahoo! Messenger File Transfer
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======================================================================
Secunia Research 18/02/2005
- Yahoo! Messenger File Transfer Filename Spoofing -
======================================================================
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
Yahoo! Messenger 6.0.0.1750
Other versions may also be affected.
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2) Severity
Rating: Less critical
Impact: Spoofing
Where: From remote
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3) Description of Vulnerability
Secunia Research has discovered a vulnerability in Yahoo! Messenger,
which can be exploited by malicious people to trick users into
executing malicious files.
The problem is that files with long filenames are not displayed
correctly in the file transfer dialogs. This can be exploited to
trick users into accepting and potentially executing malicious files.
Details:
Yahoo! Messenger wraps overly long filenames and shows only the first
line of the filename in the file transfer dialogs. The file extension
can thus be spoofed for a filename containing a whitespace and two
file extensions.
Successful exploitation requires that the option
"Hide extension for known file types" is enabled in Windows
(default setting).
The vulnerability has been confirmed in version 6.0.0.1750. Other
versions may also be affected.
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4) Solution
Update to version 6.0.0.1921.
http://messenger.yahoo.com/
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5) Time Table
04/01/2005 - Vulnerability discovered.
10/01/2005 - Vendor notified.
19/01/2005 - Vendor confirms the vulnerability.
17/02/2005 - Vendor issued fixed version.
18/02/2005 - Public disclosure.
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6) Credits
Discovered by Andreas Sandblad, Secunia Research.
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7) References
The Common Vulnerabilities and Exposures (CVE) project has assigned
candidate number CAN-2005-0243 for the vulnerability.
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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 web site:
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 web site:
http://secunia.com/secunia_research/2005-2/advisory/
======================================================================
_______________________________________________
Full-Disclosure - We believe in it.
Charter: http://lists.netsys.com/full-disclosure-charter.html
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