IBM SECURITY ADVISORY

First Issued: Fri Sep  4 05:15:17 CDT 2015

The most recent version of this document is available here:

http://aix.software.ibm.com/aix/efixes/security/openssh_advisory5.asc
https://aix.software.ibm.com/aix/efixes/security/openssh_advisory5.asc
ftp://aix.software.ibm.com/aix/efixes/security/openssh_advisory5.asc
===============================================================================
                           VULNERABILITY SUMMARY

   VULNERABILITY:       AIX OpenSSH vulnerability

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

    SOLUTION:           Apply the fix as described below.

    THREAT:             See below

    CVE Numbers:        CVE-2015-5352

    Reboot required?    NO
    Workarounds?        NO
    Protected by FPM?   NO
    Protected by SED?   NO


===============================================================================
                           DETAILED INFORMATION

I. DESCRIPTION 
   
    CVE-2015-5352
         A vulnerability in ssh when ForwardX11Trusted mode is not used, lacks a 
         check of the refusal deadline for X connections, which makes it easier for 
         remote attackers to bypass intended access restrictions via a connection 
         outside of the permitted time window

II. CVSS

    1. CVE-2015-5352
    CVSS Base Score:4.3
    CVSS Temporal Score: https://exchange.xforce.ibmcloud.com/vulnerabilities/104418
    CVSS Environmental Score*: Undefined
    CVSS Vector: (AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/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    6.0.0.6200     key_w_fs
        
	

IV. SOLUTIONS

    A. FIXES

    fix is available, and it can be downloaded from:

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

    Fixed fileset version are OpenSSH_6.0.0.6110.tar.Z and OpenSSH_6.0.0.6201.tar.Z
    Refer to the Readme file for more details on the fileset.

    Note - OpenSSH releases 6.0.0.6110 and 6.0.0.6201 are same except that 6.0.0.6201 is 
           compiled with OpenSSL v1.0.1 and contains ECDSA key support.

    To extract the fixes from the tar file:

    zcat OpenSSH_6.0.0.6110.tar.Z | tar xvf -
    (or)
    zcat OpenSSH_6.0.0.6201.tar.Z | tar xvf -

    B. FIX AND INTERIM FIX INSTALLATION

    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_6.0.0.6110
    (or)
    installp -apYd . OpenSSH_6.0.0.6201

    To install the fix package:

    installp -aXYd . OpenSSH_6.0.0.6110
    (or)            
    installp -aXYd . OpenSSH_6.0.0.6201

V. WORKAROUNDS
 
   No Workarounds.
     

VI. CONTACT US:

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

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

    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 OpenSSL public key that can be used to verify the
    signed advisories and ifixes:

        Download the key from our web page:

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

    To obtain the PGP public key that can be used to communicate
    securely with the AIX Security Team via security-alert@austin.ibm.com you
    can either:

        A. Download the key from our web page:

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

        B. 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.



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: https://exchange.xforce.ibmcloud.com/vulnerabilities/104418
    CVE-2015-5352 : http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2015-5352

    *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.