Security Bulletin: IBM GSKit Certificate Chain Vulnerability in Tivoli Access Manager and IBM Security Access Manager for Web (CVE-2013-6747)

Summary

A specially constructed certificate could cause Tivoli Access Manager and IBM Security Access Manager for Web to stop responding or crash.

Vulnerability Details

CVEID:CVE-2013-6747

DESCRIPTION:
Tivoli Access Manager and IBM Security Access Manager for Web use digital certificates to verify the identity of client and server components. If a compromised client or server presents a specially constructed certificate, it could cause the Tivoli Access Manager or IBM Security Access Manager for Web process to use excessive resources processing the certificate. This could cause the process to become unresponsive or crash. The attack does not require local network access nor does it require authentication, but some degree of specialized knowledge and techniques are required. An exploit would not impact the confidentiality of information or the integrity of data, but the availability of the system could be compromised.

CVSS:
CVSS Base Score: 7.1
CVSS Temporal Score: https://exchange.xforce.ibmcloud.com/vulnerabilities/89863
CVSS Environmental Score*: Undefined
CVSS Vector: (AV/N:AC/M:Au/N:C/N:I/N:A/C)

Affected Products and Versions

• Tivoli Access Manager version 5.1 (out of service)
• Tivoli Access Manager versions 6.0, 6.1, 6.1.1
• IBM Security Access Manager for Web version 7.0

Remediation/Fixes

Customers using Tivoli Access Manager version 5.1 should upgrade to a supported version of the product.

The following versions of GSKit contain the fix for this issue:
· GSKit version 7.0.4.48 or higher

How to obtain the patched GSKit versions for supported TAM versions:

1. Download the FixPack or iFix listed in the Vendor Fixes table below that matches your installed Tivoli Access Manager (TAM) and IBM Security Access Manager for Web (ISAM for Web) version.
2. Follow the instructions in the README to obtain and apply the appropriate GSKit fix for your product version.

Vendor Fix(es):

Workarounds and Mitigations

None