iDEFENSE Security Advisory 01.13.05: SGI IRIX inpview Design Error Vulnerability

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Date: 01/13/05

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    SGI IRIX inpview Design Error Vulnerability

    iDEFENSE Security Advisory 01.13.05
    www.idefense.com/application/poi/display?id=182&type=vulnerabilities
    January 13, 2005

    I. BACKGROUND

    The inpview program is a setuid root application that is included in the

    InPerson networked multimedia conferencing tool. InPerson networked
    multimedia conferencing tool is included in SGI IRIX.

    II. DESCRIPTION

    Local exploitation of a design error vulnerability in the inpview
    command included in multiple versions of Silicon Graphics Inc.'s IRIX
    could allow for arbitrary code execution as the root user.

    The vulnerability specifically exists due to the fact that inpview
    trusts the user environment and does not drop privileges. When the
    environment variable SUN_TTSESSION_CMD is something such as "cp /bin/jsh

    /tmp/jsh;chmod 6755 /tmp/jsh;killall -9 inpview," the chain of commands
    will be executed with root permissions, thus allowing a regular user to
    drop a setuid and setgid shell to /tmp.

    III. ANALYSIS

    All that is required to exploit this vulnerability is a local account
    and an open X display, which could be the attacker's home machine or
    another compromised system. Exploitation does not require any knowledge
    of application internals, making privilege escalation trivial, even for
    unskilled attackers.

    IV. DETECTION

    iDEFENSE has confirmed the existence of this vulnerability in SGI IRIX
    version 6.5.9 (feature) and 6.5.22 (maintenance). It is suspected that
    previous and later versions of both the feature and maintenance
    revisions of IRIX 6.5 are also vulnerable.

    V. WORKAROUND

    Only allow trusted users local access to security critical systems.

    Alternately, remove the setuid bit from inpview:

       chmod u-s /usr/lib/InPerson/inpview

    VI. VENDOR RESPONSE

    Support for the InPerson product did not extend beyond 02/2002 as noted
    in the following publication:

     techpubs.sgi.com/library/manuals/4000/007-4526-001/pdf/007-4526-001.pdf

    As a result, no patch will be issued for this vulnerability.

    VII. CVE INFORMATION

    A Mitre Corp. Common Vulnerabilities and Exposures (CVE) number has not
    been assigned yet.

    VIII. DISCLOSURE TIMELINE

    01/06/2005 Initial vendor notification
    01/07/2005 Initial vendor response
    01/13/2005 Public disclosure

    IX. CREDIT

    iDEFENSE Labs is credited with this discovery.

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

    X. LEGAL NOTICES

    Copyright (c) 2004 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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