A security vulnerability has been identified in the level of OpenSSH that is currently shipped with GPFS V220.127.116.11, or later, on Windows. The current level of OpenSSH could allow a remote attacker to execute arbitrary code on the system to corrupt memory or cause a denial of service.
OpenSSH could allow a remote attacker to execute arbitrary code on the system, caused by the failure to initialize certain data structures by the hash_buffer function in schnorr.c. An attacker could exploit this vulnerability using unknown attack vectors to corrupt memory and execute arbitrary code on the system or cause a denial of service.
CVSS Base Score: 7.5
CVSS Temporal Score: See http://xforce.iss.net/xforce/xfdb/90819 for the current score
CVSS Environmental Score*: Undefined
CVSS Vector: (AV:N/AC:L/Au:N/C:P/I:P/A:P)
Affected Products and Versions
GPFS V18.104.22.168 or later levels of V3.5 on Windows.
In GPFS V22.214.171.124, IBM upgraded to OpenSSH-6.6p1 to address this vulnerability. System administrators should update their systems to GPFS V126.96.36.199, APAR IV60817 by following the steps below.
1. Download the GPFS 188.8.131.52 update package dated July 2014 into any directory on your system. From IBM at http://www-933.ibm.com/support/fixcentral/swg/selectFixes?parent=Cluster%2Bsoftware&product=ibm/power/IBM+General+Parallel+File+System&release=3.5.0&platform=Windows&function=all
2. Extract the contents of the ZIP archive so that the .msi file it includes is directly accessible to your system.
3. Follow the instructions in the README included in the update package in order to install the OpenSSH msi package.
Workarounds and Mitigations
*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 Security Bulletin.
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.