Security Bulletin: GSKit SSL/TLS Record Length vulnerability in Tivoli Directory Server (CVE-2012-2191)
A vulnerability has been identified in the GSKit component utilized by Tivoli Directory Server (TDS). A specifically crafted malformed SSL/TLS data packet can cause the TDS server using GSKit to segmentation fault.. Remediation for the issue consists of updating GSKit 7 to version 188.8.131.52 or higher, and GSKit 8 to version 184.108.40.206 or higher.
CVE ID: CVE-2012-2191
TDS uses GSKit for SSL/TLS connections. The GSKit implementation of CBC and AEAD Cipher Suites are vulnerable to an attack from a specifically crafted malformed SSL/TLS data packet. There are several ciphers supported by TDS that are included in these Suites. An attacker would need to act as a man-in-the-middle, intercepting the SSL data stream between any LDAP client (such as ldapsearch) and a TDS server that was using an affected cipher, and inject a malformed data packet into the stream. Were an attacker able to do so, they could cause the TDS server process to crash. The attack does not require local network access nor does it require authentication, but some degree of specialized knowledge and techniques are required. An exploit would not impact the confidentiality of information or the integrity of data, however accessibility of the system could be compromised.
CVSS Base Score: 5
CVSS Temporal Score: See http://xforce.iss.net/xforce/xfdb/75996 for the current score
CVSS Environmental Score*: Undefined
CVSS Vector: (AV:N/AC:L/Au:N/C:N/I:N/A:P)
· All GSKit 7.0.x.x builds up to and including 220.127.116.11
· All GSKit 8.0.14.x up to and including 18.104.22.168
· All GSKit 8.0.15.x up to and including 22.214.171.124
Tivoli Directory Server versions 6.0, 6.1 or 6.2 using GSKit 7 should update GSKit to version 126.96.36.199 or later. The following document explains how to obtain and install updates to GSKit 7 for Tivoli Directory Server:
GSKit V7 - Install, Uninstall and Upgrade instructions for Tivoli Directory Server
Tivoli Directory Server versions 6.3 using GSKit 8 should update GSKit to version 188.8.131.52 or later. The following document explains how to obtain and install updates to GSKit 8 for Tivoli Directory Server:
GSKit V8 - Install, Uninstall and Upgrade instructions for Tivoli Directory Server
· Complete CVSS Guide
· CVSS on-line Calculator V2
· X-Force Database
· IBM Product Security Incident Response Program
· IBM Tivoli Directory Server Support
|Date of Creation/Update||Summary of Changes|
*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.
LDAP TDS ITDS IDS GSKit
More support for:
IBM Security Directory Server
Software version: 6.0, 6.1, 6.2, 6.3
Operating system(s): AIX, HP-UX, Linux, Solaris, Windows
Software edition: All Editions
Reference #: 1609029
Modified date: 05 October 2012
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