Secunia Research: Microsoft Internet Explorer Multiple Vulnerabilities

From: Andreas Sandblad (as_at_SECUNIA.COM)
Date: 02/11/05

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                         Secunia Research 09/02/2005

          - Microsoft Internet Explorer Multiple Vulnerabilities -

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    Table of Contents

    Affected Software....................................................1
    Severity.............................................................2
    Description of Vulnerabilities.......................................3
    Solution.............................................................4
    Time Table...........................................................5
    Credits..............................................................6
    References...........................................................7
    About Secunia........................................................8
    Verification.........................................................9

    ======================================================================
    1) Affected Software

    Microsoft Internet Explorer 5.01, 5.5 and 6

    ======================================================================
    2) Severity

    Rating: Highly critical
    Impact: System access, Security Bypass,
            Exposure of sensitive information
    Where: From remote

    ======================================================================
    3) Description of Vulnerabilities

    Secunia Research has discovered multiple vulnerabilities in
    Microsoft Internet Explorer, which can be exploited by malicious
    people to disclose sensitive information, bypass certain security
    restrictions and compromise a user's system.

    1) The vulnerability is caused due to insufficient validation of drag
    and drop events from the "Internet" zone to local resources for valid
    images containing script code. This can be exploited by e.g. a
    malicious website to plant arbitrary file types on a user's system
    via a specially crafted "Content-Disposition" HTTP header with a dot
    appended in the filename.

    Example:
    "Content-Disposition: attachment; filename=malicious.bat."

    This is related to:
    SA12321

    The vulnerability has been confirmed on a fully patched system
    (without MS05-014) with Internet Explorer 6.0 and
    Microsoft Windows XP SP1/SP2.

    2) The vulnerability is caused due to insufficient cross zone
    restrictions. This can be exploited to link to local resources when a
    user clicks a link on e.g a malicious website.

    The vulnerability has been confirmed in
    Microsoft Internet Explorer 6.0 running Windows 2000,
    Windows XP SP1 and Windows XP SP2.

    3) The vulnerability is caused due to an error in the handling of
    websites inside the "Temporary Internet Files" folder. This can be
    exploited to cause a site to be loaded in context of the
    "Temporary Internet Files" folder when a user clicks a link on e.g. a
    malicious website.

    Further exploitation involves gaining knowledge of a user's username
    and retrieving documents found inside the "Temporary Internet Files"
    folder.

    The vulnerability has been confirmed in
    Microsoft Internet Explorer 6.0 running Windows 2000,
    Windows XP SP1 and Windows XP SP2.

    4) A parsing error in the "codebase" attribut of the "object" tag.
    This can be exploited to execute local files with any file extension
    from the "Local Computer Zone" by appending "?.exe".

    The vulnerability has been confirmed in
    Microsoft Internet Explorer 6.0 running Windows 2000 and
    Windows XP SP1.

    NOTE: A combination of the vulnerabilities 2, 3 and 4 can be exploited
    to execute arbitrary code on Microsoft Internet Explorer running
    Windows 2000 and Windows XP SP1, in combination with a
    third-party software which stores malicious files in a predictable
    location.

    ======================================================================
    4) Solution

    Microsoft has released patches (see MS05-014 for details).

    ======================================================================
    5) Time Table

    25/09/2004 - Vulnerabilities discovered.
    04/10/2004 - Vendor notified.
    11/10/2004 - Vendor confirms the vulnerabilities.
    12/10/2004 - Additional vulnerability discovered.
    13/10/2004 - Vendor notified.
    17/10/2004 - Vendor confirms the vulnerability.
    08/02/2005 - Public disclosure.

    ======================================================================
    6) Credits

    Discovered by Andreas Sandblad, Secunia Research.

    ======================================================================
    7) References

    The Common Vulnerabilities and Exposures (CVE) project has assigned
    candidate number CAN-2005-0053 for the vulnerability.

    MS05-014 (KB867282):
    http://www.microsoft.com/technet/security/bulletin/ms05-014.mspx

    US-CERT VU#698835:
    http://www.kb.cert.org/vuls/id/698835

    SA12321:
    http://secunia.com/advisories/12321/

    ======================================================================
    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/

    ======================================================================
    9) Verification

    Please verify this advisory by visiting the Secunia web site:
    http://secunia.com/secunia_research/2004-8/advisory/

    ======================================================================

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