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             AUSCERT External Security Bulletin Redistribution

                          ESB-2008.0123 -- [AIX]
        AIX OpenSSH creates trusted X11 cookie instead of untrusted
                              6 February 2008

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        AusCERT Security Bulletin Summary
        ---------------------------------

Product:              OpenSSH
Publisher:            IBM
Operating System:     AIX
Impact:               Reduced Security
Access:               Existing Account
CVE Names:            CVE-2007-4752

Ref:                  AA-2007.0074

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IBM SECURITY ADVISORY

First Issued: Tue Feb  5 14:00:03 CST 2008
===============================================================================
                           VULNERABILITY SUMMARY

VULNERABILITY:   AIX OpenSSH creates trusted X11 cookie instead of untrusted

PLATFORMS:       AIX 5.2, 5.3, 6.1

SOLUTION:        Apply the fix or workaround as described below.

THREAT:          Privilege elevation

CERT VU Number:  n/a
CVE Number:      CVE-2007-4752
===============================================================================
                           DETAILED INFORMATION

I. DESCRIPTION

    OpenSSH could allow a remote attacker to gain elevated
    privileges. Trusted X11 cookies are created when untrusted cookies
    cannot be created, which could allow an attacker to bypass
    security restrictions and gain elevated privileges using an
    untrusted X client.

II. PLATFORM VULNERABILITY ASSESSMENT

    To determine if your system is vulnerable, execute the following
    command:

    lslpp -L openssh.base.server

    The following fileset levels are vulnerable:

    AIX 6.1: all versions less than or equal to 4.5.0.5301
    AIX 5.3: all versions less than or equal to 4.5.0.5301
    AIX 5.2: all versions less than or equal to 4.5.0.5201

III. FIXES

    A fix is available for AIX 6.1 and 5.3.  The fix can be downloaded
    from:

    http://downloads.sourceforge.net/openssh-aix/openssh-4.5p1-r2.tar.Z

    A fix for AIX 5.2 is not yet available.  Please check this site
    for updates:

    http://sourceforge.net/projects/openssh-aix

IV. WORKAROUNDS

    There are no workarounds.

V. CONTACT INFORMATION

    If you would like to receive AIX Security Advisories via email,
    please visit:

        http://www14.software.ibm.com/webapp/set2/subscriptions/pqvcmjd
 
    Comments regarding the content of this announcement can be
    directed to:

        security-alert@austin.ibm.com

    To request the PGP public key that can be used to communicate
    securely with the AIX Security Team you can either:

        A. Send an email with "get key" in the subject line to:

            security-alert@austin.ibm.com

        B. Download the key from a PGP Public Key Server. The key ID is:

            0xA6A36CCC

    Please contact your local IBM AIX support center for any
    assistance.

    eServer is a trademark of International Business Machines
    Corporation.  IBM, AIX and pSeries are registered trademarks of
    International Business Machines Corporation.  All other trademarks
    are property of their respective holders.

VI. ACKNOWLEDGMENTS

    This security vulnerability in OpenSSH was found and fixed by Jan
    Pechanec.

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===========================================================================
Australian Computer Emergency Response Team
The University of Queensland
Brisbane
Qld 4072

Internet Email: auscert@auscert.org.au
Facsimile:      (07) 3365 7031
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===========================================================================

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