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===========================================================================
             AUSCERT External Security Bulletin Redistribution

                               ESB-2014.0997
                         AIX OpenSSH Vulnerability
                               18 June 2014

===========================================================================

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

Product:           OpenSSH
Publisher:         IBM
Operating System:  AIX
Impact/Access:     Unauthorised Access -- Remote/Unauthenticated
Resolution:        Patch/Upgrade
CVE Names:         CVE-2014-2653 CVE-2014-2532 

Reference:         ESB-2014.0444
                   ESB-2014.0363

Original Bulletin: 
   http://aix.software.ibm.com/aix/efixes/security/openssh_advisory4.asc

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IBM SECURITY ADVISORY

First Issued: Tue Jun 17 04:07:12 CDT 2014 

The most recent version of this document is available here:

http://aix.software.ibm.com/aix/efixes/security/openssh_advisory4.asc
https://aix.software.ibm.com/aix/efixes/security/openssh_advisory4.asc
ftp://aix.software.ibm.com/aix/efixes/security/openssh_advisory4.asc
===============================================================================
                           VULNERABILITY SUMMARY

VULNERABILITY:   AIX OpenSSH Vulnerability  

PLATFORMS:       AIX 5.3, 6.1 and 7.1
                 VIOS VIOS 2.2.*

SOLUTION:        Apply the fix as described below.

THREAT:          See below

CVE Numbers:     CVE-2014-2532,CVE-2014-2653

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

I. DESCRIPTION 
   
    CVE-2014-2532
    OpenSSH could allow a remote attacker to bypass security restrictions, 
    caused by the inclusion of wildcard characters in the AcceptEnv lines of the sshd_config 
    configuration file within the sshd program.By using a substring before a wildcard character, 
    an attacker could exploit this vulnerability to bypass intended environment restrictions.

    CVE-2014-2653 
    OpenSSH could allow a remote attacker to bypass security restrictions, caused by an error 
    in the SSH client when handling a HostCertificate. By persuading a victim to visit a 
    specially-crafted Web site containing a malicious certificate, an attacker could exploit 
    this vulnerability using a malicious server to disable SSHFP-checking.

II. CVSS

    CVE-2014-2532
    CVSS Base Score:5
    CVSS Temporal Score:see http://xforce.iss.net/xforce/xfdb/91986
    CVSS Environmental Score*:Undefined
    CVSS Vector: (AV:N/AC:L/Au:N/C:C/I:N/A:N)

    CVE-2014-2653
    CVSS Base Score:4.3
    CVSS Temporal Score:see http://xforce.iss.net/xforce/xfdb/92116
    CVSS Environmental Score*:Undefined
    CVSS Vector: (AV:N/AC:L/Au:N/C:C/I:N/A:N)

III. PLATFORM VULNERABILITY ASSESSMENT

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

        lslpp -L openssh.base
 
        The following fileset levels are vulnerable:

        AIX Fileset      Lower Level   Upper Level    KEY
        --------------------------------------------------------
        openssh.base     4.0.0.5200    6.0.0.6106     key_w_fs

IV. SOLUTIONS

    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_6.0.0.6107.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_6.0.0.6107

    To install the fix package:

    installp -aXYd . OpenSSH_6.0.0.6107

 
V. WORKAROUNDS
 
    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:

    Note: Keywords labeled as KEY in this document are used for parsing purposes.

    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.
     
    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/91986 
    X-Force Vulnerability Database:http://xforce.iss.net/xforce/xfdb/92116
    CVE-2014-2532 :  http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2014-2532
    CVE-2014-2653 :  http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2014-2653
    


    *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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===========================================================================
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===========================================================================
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