[NEWS] Symantec Norton AntiVirus Multiple Local Privilege Escalation (MacOS)

From: SecuriTeam (support_at_securiteam.com)
Date: 11/06/05

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Date: 6 Nov 2005 14:33:08 +0200

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      Symantec Norton AntiVirus Multiple Local Privilege Escalation (MacOS)
    ------------------------------------------------------------------------

    SUMMARY

    " <http://www.symantec.com/nav/nav_mac/> Symantec's Norton AntiVirus for
    Macintosh is an antivirus solution for the Mac OS X environment."

    Local exploitation of a design error in Symantec Norton Antivirus for
    Macintosh allows attackers to gain elevated privileges.

    DETAILS

    Vulnerable Systems:
     * Symantec Norton AntiVirus for Mac version 9.0.3

    Immune Systems:
     * Symantec AntiVirus for Macintosh version 10

    DiskMountNotify Local Privilege Escalation:
    Local exploitation of a design error in the DiskMountNotify 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.

    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.

    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.

    Vendor Response:
    The vendor has released the following advisory for this issue:
    <http://www.symantec.com/avcenter/security/Content/2005.10.19.html>
    http://www.symantec.com/avcenter/security/Content/2005.10.19.html

    LiveUpdate Local Privilege Escalation:
    Local exploitation of a design error in the LiveUpdate component
    specifically exists in the permissions on the "/Library/Application
    Support/Norton Solutions Support/LiveUpdate/jlucaller" binary which
    appears to be a Java interpreter. 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 compile a Java program and provide it as an argument to this
    binary, and it will execute with root level privileges.

    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.

    Workaround:
    Unsetting the setuid bit from the "/Library/Application Support/Norton
    Solutions Support/LiveUpdate/jlucaller" binary will prevent exploitation,
    but may require that updates be performed as the System Administrator
    user.

    chmod -s "/Library/Application Support/Norton Solutions
    Support/LiveUpdate/jlucaller"

    Vendor Response:
    The vendor has released the following advisory for this issue:
    <http://www.symantec.com/avcenter/security/Content/2005.10.19a.html>
    http://www.symantec.com/avcenter/security/Content/2005.10.19a.html

    CVE Information:
     <http://www.cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2005-2759 >
    CAN-2005-2759

    Disclosure Timeline:
    08/31/2005 - Initial vendor notification
    08/31/2005 - Initial vendor response
    10/20/2005 - Coordinated public disclosure

    ADDITIONAL INFORMATION

    The information has been provided by
    <mailto:idlabs-advisories@lists.idefense.com> iDEFENSE Labs.
    The original article can be found at:
    <http://www.idefense.com/application/poi/display?id=324&type=vulnerabilities> http://www.idefense.com/application/poi/display?id=324&type=vulnerabilities,
     
    <http://www.idefense.com/application/poi/display?id=325&type=vulnerabilities> http://www.idefense.com/application/poi/display?id=325&type=vulnerabilities

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