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===========================================================================
AUSCERT External Security Bulletin Redistribution
ESB-2015.2333
AIX OpenSSH vulnerability
7 September 2015
===========================================================================
AusCERT Security Bulletin Summary
---------------------------------
Product: OpenSSH
Publisher: IBM
Operating System: AIX
Impact/Access: Unauthorised Access -- Remote/Unauthenticated
Resolution: Patch/Upgrade
CVE Names: CVE-2015-5352
Reference: ESB-2015.1814
Original Bulletin:
https://aix.software.ibm.com/aix/efixes/security/openssh_advisory5.asc
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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:M/Au:N/C:N/I:P/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.
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