Security Bulletin: TSM FastBack GSKit Certificate Chaining Vulnerability (CVE-2013-6747)

Summary

A vulnerability has been identified in the IBM Global Security Kit (GSKit) component utilized by IBM Tivoli Storage Manager (TSM) FastBack. A malformed certificate chain can cause the TSM FastBack process using GSKit to hang or crash. FastBack 6.1.9.1 or higher contains the fixing GSKit level, and is available.

Vulnerability Details

CVE ID:CVE-2013-6747

DESCRIPTION:
TSM FastBack uses GSKit for Secure Sockets Layer (SSL) connections. The GSKit implementation is vulnerable to an attack from a malformed certificate chain, containing circular reference that causes the chain building logic to loop. Were an attacker to use such a certificate when initiating an SSL connection, they could cause the TSM FastBack process to hang or crash due to memory exhaustion.

An exploit could compromise the availability of the system.

CVSS:
CVSS Base Score: 7.1
CVSS Temporal Score: See <https://exchange.xforce.ibmcloud.com/vulnerabilities/89863&gt; 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

All supported versions of IBM Tivoli Storage Manager FastBack

Remediation/Fixes

Upgrade to IBM Tivoli Storage Manager (TSM) FastBack version 6.1.9.1 or higher as soon as possible.

Workarounds and Mitigations

Do not enable ‘Encryption’ in the DR Parameters section of the DR Configuration tab in the General Configuration window in the FastBack Server.

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References

Complete CVSS v2 Guide
On-line Calculator v2

Off

CVE-2013-6747
X-Force Vulnerability Database <https://exchange.xforce.ibmcloud.com/vulnerabilities/89863&gt;

Related Information

IBM Secure Engineering Web Portal
IBM Product Security Incident Response Blog

Change History

5 May 2014: Original version 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.

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