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IBM SECURITY ADVISORY

First Issued: Fri Feb 21 11:19:24 CDT 2014
| Updated: Wed Apr 16 17:55:12 CDT 2014 
| Update: Clarified the affected OpenSSH version

The most recent version of this document is available here:

http://aix.software.ibm.com/aix/efixes/security/openssh_advisory3.asc
https://aix.software.ibm.com/aix/efixes/security/openssh_advisory3.asc
ftp://aix.software.ibm.com/aix/efixes/security/openssh_advisory3.asc
===============================================================================
                           VULNERABILITY SUMMARY

VULNERABILITY:   AIX OpenSSH Vulnerability

PLATFORMS:       AIX 5.3, 6.1 and 7.1
                 VIOS 2.X and 1.5.2

SOLUTION:        Apply the fix as described below.

THREAT:          See below

CVE Numbers:     CVE-2013-4548

Reboot required?    NO
Workarounds?        NO
Protected by FPM?   NO
Protected by SED?   NO
===============================================================================
                           DETAILED INFORMATION

I. DESCRIPTION (From cve.mitre.org)
   
    CVE-2013-4548

    The mm_newkeys_from_blob function in monitor_wrap.c in sshd in OpenSSH 
    6.2 and 6.3, when an AES-GCM cipher is used, does not properly initialize
    memory for a MAC context data structure, which allows remote i
    authenticated users to bypass intended ForceCommand and login-shell 
    restrictions via packet data that provides a crafted callback address. 

    http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2013-4548

II. CVSS

    CVSS Base Score: 6.0
    CVSS Temporal Score: See http://xforce.iss.net/xforce/xfdb/88624 for the 
    current score
    CVSS Environmental Score*: Undefined
    CVSS Vector: (AV:N/AC:M/Au:S/C:P/I:P/A:P)

III. PLATFORM VULNERABILITY ASSESSMENT

    The following fileset levels are vulnerable:

    AIX:  7.1, 6.1, 5.3: Only OpenSSH 6.0.0.6103 
    VIOS: 2.X and 1.5.2: Only OpenSSH 6.0.0.6103 

    Note: To find out whether the affected filesets are installed on your
    systems, refer to the lslpp command found in AIX user's guide.

IV. FIXES

    A fix is available, and it can be downloaded from:

    https://www14.software.ibm.com/webapp/iwm/web/preLogin.do?source=aixbp

    To extract the fixes from the tar file:

    zcat OpenSSH_6.0.0.6104.tar.Z | tar xvf -

    IMPORTANT: If possible, it is recommended that a mksysb backup
    of the system be created.  Verify it is both bootable and
    readable before proceeding.

    To preview the fix installation:

    installp -apYd . OpenSSH_6.0.0.6104

    To install the fix package:

    installp -aXYd . OpenSSH_6.0.0.6104

V. WORKAROUNDS

    There are no workarounds.

VI. CONTACT INFORMATION

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

        http://www.ibm.com/systems/support

    and click on the "My notifications" link.

    To view previously issued advisories, please visit:

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

        security-alert@austin.ibm.com

    To obtain 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 our web page:

  http://www.ibm.com/systems/resources/systems_p_os_aix_security_pgpkey.txt

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

            0x28BFAA12

    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.


VII. REFERENCES:

    Complete CVSS Guide: http://www.first.org/cvss/cvss-guide.html
    On-line Calculator V2: http://nvd.nist.gov/cvss.cfm?calculator&adv&version=2
    X-Force Vulnerability Database: http://xforce.iss.net/xforce/xfdb/88624
    CVE-2013-4548: http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2013-4548

    *The CVSS Environment Score is customer environment specific and will
    ultimately impact the Overall CVSS Score. Customers can evaluate the
    impact of this vulnerability in their environments by accessing the links
    in the Reference section of this Flash.

    Note: According to the Forum of Incident Response and Security Teams
    (FIRST), the Common Vulnerability Scoring System (CVSS) is an "industry
    open standard designed to convey vulnerability severity and help to
    determine urgency and priority of response." IBM PROVIDES THE CVSS SCORES
    "AS IS" WITHOUT WARRANTY OF ANY KIND, INCLUDING THE IMPLIED WARRANTIES OF
    MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. CUSTOMERS ARE
    RESPONSIBLE FOR ASSESSING THE IMPACT OF ANY ACTUAL OR POTENTIAL SECURITY
    VULNERABILITY.
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