IBM Support

Security Bulletin: Vulnerabilities in ClearCase GSKit Component (CVE-2013-6747)

Security Bulletin


A certificate chain presented by a Client or Server could contain a circular reference that will cause the chain building logic to loop which can lead to a program crash or hang due to memory exhaustion.

Vulnerability Details

Subscribe to My Notifications to be notified of important product support alerts like this.
  • Follow this link for more information (requires login with your IBM ID)

CVE ID: CVE-2013-6747


A certificate chain presented by a Client or Server could contain a circular reference that will cause the chain building logic to loop which can lead to a program crash or hang due to memory exhaustion.

The IBM GSKit is used if ClearCase on Windows platforms is configured to integrate with IBM Rational ClearQuest with communication over SSL (https). This applies to Base CC/CQ integrations using Change Management Interface (CMI) and to UCM-enabled CQ integration via OSLC. If your ClearCase deployment is not using these integrations with ClearQuest, 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.

The IBM GSKit is also used by CCRC WAN server (all platforms) when supporting SSL connections.

CVSS Base Score: 7.1
CVSS Temporal Score: for the current score
CVSS Environmental Score*: Undefined
CVSS Vector: (AV/N:AC/M:Au/N:C/N:I/N:A/C)

Affected Products and Versions

IBM Rational ClearCase versions 7.1.1 through, 7.1.2 through, 8.0.0 through, and 8.0.1 through


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.

Client fixes (for Windows ClearCase clients meeting the description above of vulnerable configurations):

Server fixes (for CCRC WAN server):

Install GSKit fixes to IBM HTTP Server, if you use SSL on your WAN server. You need the fix for APAR PI09443. To upgrade:

  • ClearCase release 7.1.x: Document 1390803 explains how to update IBM HTTP Server for IBM Rational ClearCase WAN servers at release 7.1.x. Consult those instructions when applying the IHS interim fix or fix pack containing the fix, as listed in IHS security bulletin 1663941.

  • ClearCase release 8.0.x: Upgrade IBM HTTP Server to a version including the fix (see the IHS bulletin), or install the IHS interim fix. Consult IHS security bulletin 1663941 for the releases of IHS that contain the fixes, and apply the fixes relevant for your version of IHS.

Workarounds and Mitigations


Get Notified about Future Security Bulletins





Change History

* 19 March 2014: 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.

[{"Product":{"code":"SSSH27","label":"Rational ClearCase"},"Business Unit":{"code":"BU053","label":"Cloud & Data Platform"},"Component":"CCRC WAN Server","Platform":[{"code":"PF002","label":"AIX"},{"code":"PF010","label":"HP-UX"},{"code":"PF016","label":"Linux"},{"code":"PF027","label":"Solaris"},{"code":"PF033","label":"Windows"}],"Version":"7.1;;;7.1.1;;;;;;;;;;7.1.2;;;;;;;;;;;;;8.0;;;;;;;;;;8.0.1;;","Edition":"","Line of Business":{"code":"LOB36","label":"IBM Automation"}}]

Document Information

Modified date:
10 July 2018