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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
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 22.214.171.12403 VIOS: 2.X and 1.5.2: Only OpenSSH 126.96.36.19903 Note: To find out whether the affected filesets are installed on your systems, refer to the lslpp command found in AIX user's guide.
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_188.8.131.5204.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_184.108.40.20604 To install the fix package: installp -aXYd . OpenSSH_220.127.116.1104
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: firstname.lastname@example.org 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: email@example.com B. Download the key from our web page:
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.
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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