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Security Bulletin: Vulnerabilities in GSKit affect IBM Rational ClearCase (CVE-2015-0159 and CVE-2014-6221)

Security Bulletin


GSKit is an IBM component that is used by IBM Rational ClearCase. The GSKit that is shipped with IBM Rational ClearCase contains multiple security vulnerabilities. IBM Rational ClearCase has addressed the applicable CVEs.

Vulnerability Details

CVEID: CVE-2014-6221
Random Data Generation using GSKit MSCAPI/MSCNG Interface Code does not generate cryptographically random data. An attacker could use this weakness to gain complete confidentially and/or integrity compromise.
CVSS Base Score: 8.8
CVSS Temporal Score: See for the current score
CVSS Environmental Score*: Undefined
CVSS Vector: (AV:N/AC:M/Au:N/C:C/I:C/A:N)

CVEID: CVE-2015-0159
DESCRIPTION: An unspecified error in GSKit usage of OpenSSL crypto function related to the production of incorrect results on some platforms by Bignum squaring (BN_sqr) has an unknown attack vector and impact in some ECC operations.
CVSS Base Score: 2.6
CVSS Temporal Score: See for the current score
CVSS Environmental Score*: Undefined
CVSS Vector: (AV:N/AC:H/Au:N/C:N/I:P/A:N)

Affected Products and Versions

Rational ClearCase through, through, and 8.0.1 through
The IBM GSKit is used if ClearCase on Windows platforms is configured to integrate with IBM Rational ClearQuest, Rational Team Concert, or Jira with communication over SSL (https). This applies to any integration using Change Management Interface (CMI), and to non-CMI based UCM-enabled CQ integration via OSLC. If your ClearCase deployment is not using these integrations, or not using SSL with the integrations, then your deployment is not sensitive to this attack. The UCM-enabled CQ integration without using OSLC (SQUID) is not sensitive to this attack.
CMI and OSLC integrations

ClearCase Windows Client Version
8.0.1 through
Affected if you use CMI or OSLC integrations through
Affected if you use CMI or OSLC integrations
8.0 through
Not affected through
Affected if you use CMI or OSLC integrations
7.1.2 through
Not affected
7.0.x, 7.1.0.x, 7.1.1.x
Not affected


The solution is to upgrade to a fix pack of ClearCase that has a newer GSKit component that corrects these vulnerabilities. Please see below for information on the fixes available.

Affected Versions
Applying the fix
8.0.1 through
Install Rational ClearCase Fix Pack 7 ( for 8.0.1 through
Install Rational ClearCase Fix Pack 14 ( for 8.0 through
Customers on extended support contracts should install Rational ClearCase Fix Pack 17 ( for 7.1.2

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Important Note

IBM strongly suggests that all System z customers be subscribed to the System z Security Portal to receive the latest critical System z security and integrity service. If you are not subscribed, see the instructions on the System z Security web site. Security and integrity APARs and associated fixes will be posted to this portal. IBM suggests reviewing the CVSS scores and applying all security or integrity fixes as soon as possible to minimize any potential risk.



Change History

* 18 March 2015: Original copy published

*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.

Internal Use Only

Might be an IHS fix to announce too?

If so:

Server fixes (for CCRC WAN server):

Install a fix to IBM HTTP Server if you use SSL on your WAN server and you use IBM HTTP Server version 8 or higher. You need the fix for APAR XXXX. Consult IHS security bulletin 1676092 for the details of the fix.

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Document Information

Modified date:
10 July 2018