[VulnWatch] Secunia Research: Yahoo! Messenger Audio Setup Wizard Privilege Escalation

From: Carsten H. Eiram (che_at_secunia.com)
Date: 02/18/05

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    Date: Fri, 18 Feb 2005 15:00:44 +0100
    
    

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                         Secunia Research 18/02/2005

         - Yahoo! Messenger Audio Setup Wizard Privilege Escalation -

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    Table of Contents

    Affected Software....................................................1
    Severity.............................................................2
    Vendor's Description of Software.....................................3
    Description of Vulnerability.........................................4
    Solution.............................................................5
    Time Table...........................................................6
    Credits..............................................................7
    References...........................................................8
    About Secunia........................................................9
    Verification........................................................10

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    1) Affected Software

    Yahoo! Messenger 6.0.0.1750 (for Windows)

    NOTE: Other versions may also be affected.

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    2) Severity

    Rating: Less Critical
    Impact: Privilege Escalation
    Where: Local System

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    3) Vendor's Description of Software

    Yahoo! Messenger:
    "Yahoo! Messenger is a free instant messaging service that you can
    use to communicate with other people who also use Yahoo! Messenger".
     
    Product link:
    http://messenger.yahoo.com/

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    4) Description of Vulnerability

    Secunia Research has discovered a vulnerability in Yahoo! Messenger,
    which can be exploited by malicious, local users to gain escalated
    privileges.

    The vulnerability is caused due to a combination of weak default
    directory permissions and the Audio Setup Wizard (asw.dll) invoking
    the "ping.exe" utility insecurely during the connection testing phase.

    This can be exploited to execute arbitrary code with the privileges
    of another user by placing a malicious "ping.exe" file in the
    application's "Messenger" directory.

    Successful exploitation requires that a user runs the Audio Setup
    Wizard and that the application has been installed in a non-default
    location (not as a subdirectory to the "Program Files" directory).

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    5) Solution

    Vendor issued a fixed version on February 16, 2005.

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    6) Time Table

    04/01/2005 - Vendor notified.
    14/01/2005 - Vendor contacted second time.
    17/01/2005 - Vendor response.
    16/02/2005 - Vendor issues updated version.
    18/02/2005 - Public disclosure.

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    7) Credits

    Discovered by Carsten Eiram, Secunia Research.

    ======================================================================
    8) References

    The Common Vulnerabilities and Exposures (CVE) project has assigned
    candidate number CAN-2005-0242 for the vulnerability.

    ======================================================================
    9) 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/

    ======================================================================
    10) Verification

    Please verify this advisory by visiting the Secunia web site:
    http://secunia.com/secunia_research/2004-6/

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

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