[VulnWatch] iDEFENSE Security Advisory 10.20.05: Symantec Norton AntiVirus DiskMountNotify Local Privilege Escalation

From: iDEFENSE Labs (labs-no-reply_at_idefense.com)
Date: 10/20/05

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    Date: Thu, 20 Oct 2005 17:35:34 -0400
    To: <bugtraq@securityfocus.com>, <vulnwatch@vulnwatch.org>, <full-disclosure@lists.grok.org.uk>
    
    

    Symantec Norton AntiVirus DiskMountNotify Local Privilege Escalation

    iDEFENSE Security Advisory 10.20.05
    www.idefense.com/application/poi/display?id=325&type=vulnerabilities
    October 20, 2005

    I. BACKGROUND

    Symantec's Norton AntiVirus for Macintosh is an antivirus solution for
    the Mac OS X environment. More information is available at the link
    shown:

      http://www.symantec.com/nav/nav_mac/

    II. DESCRIPTION

    Local exploitation of a design error in the DiskMountNotify component
    of Symantec Corp.'s Norton Antivirus 9.0 for Macintosh may allow a user
    to gain elevated privileges. The vulnerability specifically exists in
    failing to specify an explicit PATH for the "/Library/Application
    Support/Norton Solutions Support/Norton
    AntiVirus/DiskMountNotify.app/Contents/MacOS/DiskMountNotify" binary.

    This binary is setuid, meaning it will run with the permissions of the
    owner, and is owned by the System Administrator, which is equivalent to
    the Unix root user. A user can simply add a directory they control to
    the beginning of the PATH environment variable and DiskMountNotify will
    call 'ps' or 'grep' from that directory with root level privileges.

    III. ANALYSIS

    Successful exploitation allows a local attacker to execute arbitrary
    commands as the System Administrator user. This allows complete system
    compromise including the installation and removal of applications, and
    ability to read and write any file on the system.

    IV. DETECTION

    iDEFENSE has confirmed this vulnerability exists in version 9.0.3 of
    Norton Antivirus for Macintosh.

    V. WORKAROUND

    Unsetting the setuid bit from the "/Library/Application Support/Norton
    Solutions Support/Norton
    AntiVirus/DiskMountNotify.app/Contents/MacOS/DiskMountNotify" binary
    will prevent exploitation, but may prevent automatic scanning on
    mounting by non-administrator users.

    VI. VENDOR RESPONSE

    The vendor has released the following advisory for this issue:

     http://www.symantec.com/avcenter/security/Content/2005.10.19.html

    VII. CVE INFORMATION

    The Common Vulnerabilities and Exposures (CVE) project has assigned the
    name CAN-2005-2759 to this issue. This is a candidate for inclusion in
    the CVE list (http://cve.mitre.org), which standardizes names for
    security problems.

    VIII. DISCLOSURE TIMELINE

    08/31/2005 Initial vendor notification
    08/31/2005 Initial vendor response
    10/20/2005 Coordinated public disclosure

    IX. CREDIT

    DigitalMunition.com is credited with reporting this vulnerability.

    Get paid for vulnerability research
    http://www.idefense.com/poi/teams/vcp.jsp

    Free tools, research and upcoming events
    http://labs.idefense.com

    X. LEGAL NOTICES

    Copyright (c) 2005 iDEFENSE, Inc.

    Permission is granted for the redistribution of this alert
    electronically. It may not be edited in any way without the express
    written consent of iDEFENSE. If you wish to reprint the whole or any
    part of this alert in any other medium other than electronically, please
    email customerservice@idefense.com for permission.

    Disclaimer: The information in the advisory is believed to be accurate
    at the time of publishing based on currently available information. Use
    of the information constitutes acceptance for use in an AS IS condition.
    There are no warranties with regard to this information. Neither the
    author nor the publisher accepts any liability for any direct, indirect,
    or consequential loss or damage arising from use of, or reliance on,
    this information.


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