Security Bulletin: IBM GSKit Certificate Chain Vulnerability in Tivoli Access Manager and IBM Security Access Manager for Web (CVE-2013-6747)
A specially constructed certificate could cause Tivoli Access Manager and IBM Security Access Manager for Web to stop responding or crash.
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 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
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 126.96.36.199 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.
Workarounds and Mitigations
Get Notified about Future Security Bulletins
ReferencesComplete CVSS v2 Guide
On-line Calculator v2
Related informationIBM Secure Engineering Web Portal
IBM Product Security Incident Response Blog
14 February 2014 - initial publication
*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.
More support for:
IBM Security Access Manager for Web
Software version: 5.1, 6.0, 6.1, 6.1.1, 7.0
Operating system(s): Platform Independent
Reference #: 1664755
Modified date: 09 January 2015