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Security Bulletin: Vulnerabilities in GSKit affect IBM Rational ClearQuest (CVE-2015-0138)

Security Bulletin


GSKit is an IBM component that is used by IBM Rational ClearQuest. The GSKit that is shipped with IBM Rational ClearQuest contains multiple security vulnerabilities including the “FREAK: Factoring Attack on RSA-EXPORT keys" TLS/SSL client and server vulnerability. IBM Rational ClearQuest has addressed the applicable CVEs.

Vulnerability Details

CVEID: CVE-2015-0138
DESCRIPTION: A vulnerability in various IBM SSL/TLS implementations could allow a remote attacker to downgrade the security of certain SSL/TLS connections. An IBM SSL/TLS client implementation could accept the use of an RSA temporary key in a non-export RSA key exchange ciphersuite. This could allow a remote attacker using man-in-the-middle techniques to facilitate brute-force decryption of TLS/SSL traffic between vulnerable clients and servers.

This vulnerability is also known as the FREAK attack.

CVSS Base Score: 4.3
CVSS Temporal Score: See for the current score
CVSS Environmental Score*: Undefined
CVSS Vector: (AV:N/AC:M/Au:N/C:N/I:P/A:N)

Affected Products and Versions

IBM Rational ClearQuest versions:

8.0.1 through
8.0 through
7.1.1.x, 7.1.2.x (all versions)

You are vulnerable if you configure Rational ClearQuest to use LDAP authentication with secure sockets connections.


The solution is to update to the latest fix pack.

Affected Versions
Applying the fix
Customers with extended support contracts should install Rational ClearQuest Fix Pack 18 (

You should verify applying this fix does not cause any compatibility issues.

Workarounds and Mitigations


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Change History

* 20 March 2013: Original Copy published
* 24 June 2015: fix is now included in fix packs

*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.


Review the IBM security bulletin disclaimer and definitions regarding your responsibilities for assessing potential impact of security vulnerabilities to your environment.

Internal Use Only

The fixes are on the test fix portal, included in the following TestFixes:

they can be installed using Installation Manager.

For 2015B, we revised the instructions to apply a fix pack instead

The test fixes and fixpacks above supersede the previous manually-installed solution, which was:

The fixes are LA iFixes that apply on top of the 2015A fix packs
(,, Customers should upgrade to those
releases before applying these fixes.

For each platform, for each affected release, there is a zip file on the
Rational fix portal with the fixes, and a matching README file with
manual installation instructions. The customer should download the
fixes and READMEs for their platform(s)/release(s).

The plan is to incorporate all these fixes in 2015B fix packs, but we
are publishing them early to meet the IBM security team's guidelines.

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Document Information

Modified date:
29 September 2018