A vulnerability has been identified in the GSKit component utilized by IBM Security Directory Server (ISDS) and IBM Tivoli Directory Server (TDS). A malformed certificate chain can cause the ISDS or TDS client application or server process using GSKit to hang or crash. Remediation for the issue consists of upgrading affected GSKit following the instructions at the end of this bulletin.
ISDS and TDS use GSKit for SSL/TLS connections. The GSKit implementation is vulnerable to an attack from a malformed certificate chain. Were an attacker to use such a certificate when initiating an SSL/TLS connection, they could cause the ISDS or TDS client application or server process to hang or crash.
The attack does not require local network access or authentication but specialized knowledge and techniques are required. An exploit would not impact the confidentiality of information or the integrity of data, however availability of the system can be compromised.
CVSS Base Score: 7.1
CVSS Temporal Score: http://xforce.iss.net/xforce/xfdb/89863
CVSS Environmental Score*: Undefined
CVSS Vector: (AV:N/AC:M/Au:N/C:N/I:N/A:C)
All supported IBM Security Directory Server and Tivoli Directory Server versions are affected.
- If using GSKit v7, upgrade to GSKit version 220.127.116.11 or higher as soon as possible.
- If using GSKit v8, upgrade to GSKit version 18.104.22.168 or higher as soon as possible.
|Tivoli Directory Server Version||GSKit Version||Interim Fix|
|Tivoli Directory Server 6.1||GSKit v7||22.214.171.124|
|Tivoli Directory Server 6.2.0||GSKit v7||126.96.36.199|
|Tivoli Directory Server 6.3.0||GSKit v8||188.8.131.52|
|IBM Security Directory Server 6.3.1||GSKit v8||184.108.40.206|
· Complete CVSS Guide
· X-Force Vulnerability Database
· IBM Secure Engineering Web Portal
· IBM Product Security Incident Response Blog
|24 January 2014||Initial publication|
*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.