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

Security Bulletin

Summary

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.

Remediation/Fixes

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.x	Document 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.x	Document 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.x	Apply the IBM HTTP Server fix directly to your CCRC WAN server host. No ClearCase-specific steps are necessary.

Workarounds and Mitigations

None

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References

Complete CVSS v2 Guide
On-line Calculator v2

Off

Acknowledgement

None

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.

Disclaimer

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

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

DESCRIPTION:
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 https://exchange.xforce.ibmcloud.com/vulnerabilities/92844 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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Tips

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