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Security Bulletin: A security vulnerability has been identified in IBM HTTP Server shipped with IBM Rational ClearCase

Security Bulletin


IBM HTTP Server is shipped as a component of IBM Rational ClearCase. Information about a security vulnerability affecting IBM HTTP Server has been published in a security bulletin.

Vulnerability Details

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Review security bulletin 1672843: IBM HTTP Server CPU utilization (CVE-2014-0963) for vulnerability details.

Affected Products and Versions

IBM Rational ClearCase, CM Server/CCRC WAN server component (not other parts of IBM Rational ClearCase).

Versions affected: 7.0.0.x, 7.0.1.x, 7.1.0.x, 7.1.1.x, 7.1.2.x, 8.0.0.x, 8.0.1.x.


Update your CM Server/CCRC WAN server system to a newer version of IBM HTTP Server.

Apply the fixes listed in security bulletin 1672843.

Affected Versions
Applying the fix
7.0.0.x, 7.0.1.xDocument 1295608 explains how to update IBM HTTP Server in the RWP component of ClearCase. Consult those instructions when applying the fix.
7.1.0.x, 7.1.1.x, and 7.1.2.xDocument 1390803 explains how to update IBM HTTP Server for ClearCase CM Servers at release 7.1.x. Consult those instructions when applying the fix.
8.0.0.x, 8.0.1.xApply the IBM HTTP Server fix directly to your CCRC WAN server host. No ClearCase-specific steps are necessary.

Workarounds and Mitigations


Get Notified about Future Security Bulletins





Change History

* 19 May 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.

Internal Use Only

IBM20140430-1552-02 Advisory DB ID = 1718

draft text for when announcing specific CVE here:

Security Bulletin: IBM Rational ClearCase CPU utilization (CVE-2014-0963)

A vulnerability in relation to TLS Record Processing has been discovered related to TLS 1.0 and later which can result in high CPU utilization that requires a system reboot to resolve.

IBM Rational ClearCase (CCRC WAN server component) is affected by a problem related to the SSL implementation which, under very specific conditions, can cause CPU utilization to rapidly increase.

CVE ID: CVE-2014-0963

IBM Rational ClearCase (CCRC WAN server component) is affected by a problem with the handling of certain SSL messages. The TLS implementation can, under very specific conditions, cause CPU utilization to rapidly increase. The situation occurs only in a certain error case that causes a single thread to begin looping. If this happens multiple times, more threads will begin to loop and an increase in CPU utilization will be seen. This increase could ultimately result in CPU exhaustion and unresponsiveness of the CCRC WAN server and other software running on the affected system.

This issue can affect the availability of the system, but does not impact system confidentiality or integrity. This vulnerability can be remotely exploited, authentication is not required and the exploit is moderately complex.

To determine if your systems are being affected by this issue, you can monitor the CPU utilization for CCRC WAN server instances.

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

IBM has provided patches for all affected versions. Follow the installation instructions in the README files included with the patch.

To fix this issue, install an update to IBM HTTP Server (IHS). Apply the fix for APAR PI17025.

XXX validate this with IHS team's bulletin:

Method One) Monitor CPU utilization of your CCRC WAN server instances. If utilization becomes abnormally high, stop and restart the affected instance.

Method Two) Follow the guidance from the IHS security bulletin to change your configuration of IHS to avoid the problem.

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Document Information

Modified date:
10 July 2018