[NT] Servers Alive Privilege Escalation Vulnerability

From: SecuriTeam (support_at_securiteam.com)
Date: 03/17/05

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Date: 17 Mar 2005 11:11:46 +0200

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      Servers Alive Privilege Escalation Vulnerability
    ------------------------------------------------------------------------

    SUMMARY

    " <http://www.woodstone.nu/salive/index.asp> Servers Alive is an
    end-to-end network monitoring tool. It works agentless and across
    operating systems. Its checks and alerts are on the cutting edge of
    technology. It allows you to easily monitor hundreds of servers, or
    Internet services on a server, for uptime and availability. When it
    detects that a monitored service or computer has gone down it can make you
    aware through a variety of means."

    A privilege escalation vulnerability has been discovered in Servers Alive,
    allowing a local non-privileged user to obtain SYSTEM privileges.

    DETAILS

    Vulnerable Systems:
     * Servers Alive versions 4.1 and 5.0

    Servers Alive can be run in two modes: as an application or as a service.
    When run as a service, the application is permitted to interact with the
    desktop and runs under the context of SYSTEM. When clicking the 'Local
    manual' under help, the application does not drop privileges.
    Consequently, it is possible to assume SYSTEM privileges by:
    1) Viewing the source of the help file, which opens in Notepad
    2) In Notepad, selecting File, Open
    3) Launching a system utility such as cmd.exe.

    Workaround:
     * Only allow trusted users with Administrator-level privileges to logon
    interactively.
     * Physically secure the server on which the application is installed.
     * Do not run the application as a service.

    Disclosure Timeline:
     * 01.24.05 - Vendor notified.
     * 01.25.05 - Vendor responded, discussion ensued.
     * 01.29.05 - CERT notified
     * 02.18.05 - CVE Candidate Number assigned from CERT
     * 03.15.05 - Advisory publicly released

    CVE Information:
     <http://www.cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2005-0352>
    CAN-2005-0352

    ADDITIONAL INFORMATION

    The information has been provided by <mailto:secure@michaelstarks.com>
    Michael Starks.

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