[NT] Computer Associates eTrust EZ Antivirus Insecure File Permission

From: SecuriTeam (support_at_securiteam.com)
Date: 12/15/04

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Date: 15 Dec 2004 18:37:52 +0200

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      Computer Associates eTrust EZ Antivirus Insecure File Permission
    ------------------------------------------------------------------------

    SUMMARY

    Computer Associates eTrust EZ Antivirus is "antivirus protection software
    for home and business use. It provides complete protection, detection and
    elimination of thousands of computer viruses, worms, and Trojan Horse
    programs".

    Local exploitation of an insecure permission vulnerability in Computer
    Associates eTrust EZ Antivirus allows attackers to escalate privileges or
    disable protection.

    DETAILS

    Vulnerable Systems:
     * eTrust EZ Antivirus version 7.0.1.4
     * eTrust EZ Antivirus version 7.0.0 up to 7.0.4

    Immune Systems:
     * eTrust EZ Antivirus version 7.0.5

    Computer Associates eTrust EZ Antivirus is a product used to protect a
    personal computer from virus infections. The vulnerability specifically
    exists in the default file Access Control List (ACL) settings that are
    applied during installation. When an administrator installs eTrust EZ
    Antivirus, the default ACL allows any user to modify the installed files.
    Because of the fact that some of the programs run as system services, a
    user can simply replace an installed eTrust EZ Antivirus file with their
    own malicious code that will later be executed with system privileges. One
    such file that would be a target for this is VetMsg.exe.

    Analysis:
    Successful exploitation allows local attackers to escalate privileges to
    the system level. It is also possible to use this vulnerability to simply
    disable protection by moving all of the executable files so that they
    cannot start upon a reboot.

    Workaround:
    Apply proper Access Control List settings to the directory that eTrust EZ
    Antivirus is installed in. The ACL rules should make sure that no regular
    users can modify files in the directory.

    Vendor Response:
    "With the assistance of iDEFENSE, Computer Associates has identified a
    medium-risk vulnerability in the installation and updating components of
    eTrustTM EZ Antivirus which may allow a local user to escalate their user
    privileges on a PC and disable protection.

    Effected generally available releases of eTrust EZ Antivirus include:
     * eTrust EZ Antivirus r7.0.0 - r7.0.4 installed on PC's
     - running Windows NT, 2000 or XP
     - with NTFS formatted drives

    Computer Associates has actively addressed this issue in eTrust EZ
    Antivirus r7.0.5 and above.

    More information about this vulnerability and instructions on how to
    upgrade to the latest version of eTrust EZ Antivirus can be found at:
    <http://crm.my-etrust.com/login.asp?username=guest&target=DOCUMENT&openparameter=2222> http://crm.my-etrust.com/login.asp?username=guest&target=DOCUMENT&openparameter=2222

    At Computer Associates, we take every report of exposure with the utmost
    urgency, to ensure that no customer is left in a vulnerable situation. We
    have assigned this vulnerability the ID number 32054."

    CVE Information:
     <http://www.cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2004-1149>
    CAN-2004-1149

    Disclosure Timeline:
    10/26/2004 - Initial vendor notification
    10/29/2004 - Initial vendor response
    12/15/2004 - Coordinated public disclosure

    ADDITIONAL INFORMATION

    The information has been provided by
    <mailto:idlabs-advisories@idefense.com> iDEFENSE.
    The original article can be found at:
    <http://www.idefense.com/application/poi/display?id=164&type=vulnerabilities> http://www.idefense.com/application/poi/display?id=164&type=vulnerabilities

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