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ESB-2014.0695 - [Win][Linux] IBM Tivoli Storage Manager FastBack: Denial of service - Remote/unauthenticated

Date: 09 May 2014
References: ESB-2014.0113  ESB-2014.0201  ESB-2014.0309  

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===========================================================================
             AUSCERT External Security Bulletin Redistribution

                               ESB-2014.0695
 Security Bulletin: TSM FastBack GSKit Certificate Chaining Vulnerability
                                9 May 2014

===========================================================================

        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

- --------------------------BEGIN INCLUDED TEXT--------------------

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

- --------------------------END INCLUDED TEXT--------------------

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===========================================================================
Australian Computer Emergency Response Team
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