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AUSCERT External Security Bulletin Redistribution
ESB-2014.0695
Security Bulletin: TSM FastBack GSKit Certificate Chaining Vulnerability
9 May 2014
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AusCERT Security Bulletin Summary
---------------------------------
Product: IBM Tivoli Storage Manager FastBack
Publisher: IBM
Operating System: Windows
Linux variants
Impact/Access: Denial of Service -- Remote/Unauthenticated
Resolution: Patch/Upgrade
CVE Names: CVE-2013-6747
Reference: ESB-2014.0309
ESB-2014.0201
ESB-2014.0113
Original Bulletin:
http://www-01.ibm.com/support/docview.wss?uid=swg21670524
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Security Bulletin: TSM FastBack GSKit Certificate Chaining Vulnerability
(CVE-2013-6747)
Security Bulletin
Document information
More support for:
Tivoli Storage Manager FastBack
Software version:
All Supported Versions
Operating system(s):
Platform Independent
Software edition:
All Editions
Reference #:
1670524
Modified date:
2014-05-05
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 http://xforce.iss.net/xforce/xfdb/89863
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.
References
Complete CVSS Guide
On-line Calculator V2
CVE-2013-6747
X-Force Vulnerability Database http://xforce.iss.net/xforce/xfdb/89863
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
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.
Cross reference information
Segment Product Component Platform Version Edition
Storage Management Tivoli Storage Manager FastBack Center Platform Independent All Versions All Editions
Storage Management Tivoli Storage Manager FastBack for Bare Machine Recovery Windows 6.1 All Editions
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