[NT] Insecure Default File System Permissions n Microsoft Versions of Kerio Software

From: SecuriTeam (support_at_securiteam.com)
Date: 12/16/04

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Date: 16 Dec 2004 14:11:46 +0200

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      Insecure Default File System Permissions n Microsoft Versions of Kerio
    Software
    ------------------------------------------------------------------------

    SUMMARY

    As a result of its collaboration relationship the Secure Computer Group
    (SCG) along with dotpi.com Research Labs have determined the following
    security issue on some Kerio Software.

    Kerio WinRoute Firewall, Kerio ServerFirewall and Kerio MailServer are
    installed by default under 'Program Files' system folder. No change is
    done to the ACLs after the installation process. As a result, anyone
    belonging to the 'Power Users' system group would be able to modify binary
    files of services running as LOCALSYSTEM, drop malicious DLLs the plug-ins
    folder or perform any change on the XML files where the service settings
    are stored.

    System administrators should enforce ACL security settings in order solve
    this problem. It is also highly recommended to verify this settings as
    part of the planning, installation, hardening and auditing processes.

    New versions of the software solve this an other minor problems so it is
    upgrade its highly recommended.

    DETAILS

    Vulnerable Systems:
     * Kerio WinRoute Firewall version 6.0.8 and prior
     * Kerio ServerFirewall version 1.0.0 and prior
     * Kerio MailServer version 6.0.4 and prior

    Immune Systems:
     * Kerio WinRoute Firewall version 6.0.9
     * Kerio ServerFirewall version 1.0.1
     * Kerio MailServer version 6.0.5

    CVE Information:
     <http://www.cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2004-1023>
    CAN-2004-1023

    Solutions and recommendations:
    Enforce the file system ACLs and/or upgrade to the latest versions:
     * Kerio WinRoute Firewall 6.0.9
     * Kerio ServerFirewall 1.0.1
     * Kerio MailServer 6.0.5

    As in any other case, follow, as much as possible, the Industry 'Best
    Practices' on Planning, Deployment and Operation on this kind of services.

    ADDITIONAL INFORMATION

    The information has been provided by <mailto:scg@udc.es> Secure Computer
    Group.
    The original article can be found at:
    <http://research.tic.udc.es/scg/advisories/20041214-2.txt>
    http://research.tic.udc.es/scg/advisories/20041214-2.txt

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