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             AUSCERT External Security Bulletin Redistribution

                               ESB-2014.0578
         Security Bulletin: Vulnerability GSKit Certificate Chain
                       Vulnerability (CVE-2013-6747)
                               23 April 2014

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        AusCERT Security Bulletin Summary
        ---------------------------------

Product:           IBM GSKit
Publisher:         IBM
Operating System:  AIX
                   HP-UX
                   IBM i
                   Linux variants
                   Solaris
                   Windows
                   i5/OS
Impact/Access:     Denial of Service -- Remote/Unauthenticated
Resolution:        Patch/Upgrade
CVE Names:         CVE-2013-6747  

Reference:         ESB-2014.0504
                   ESB-2014.0379
                   ESB-2014.0309
                   ESB-2014.0201
                   ESB-2014.0113

Original Bulletin: 
   http://www-01.ibm.com/support/docview.wss?uid=swg21670831

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Security Bulletin: Vulnerability GSKit Certificate Chain Vulnerability 
(CVE-2013-6747)

Document information

More support for:
IBM License Metric Tool

Software version:
7.2.2, 7.5

Operating system(s):
AIX, AIX 6.1, HP-UX, IBM i, Linux, Solaris, Windows, i5/OS

Software edition:
All Editions

Reference #:
1670831

Modified date:
2014-04-18

Security Bulletin

Summary

A certificate chain presented by a Client or Server could contain a circular 
reference that will cause the chain building logic to loop which can lead to a 
segv crash or hang due to memory exhaustion.

Vulnerability Details

CVE ID: CVE-2013-6747
IBM CVSS 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)

DESCRIPTION:

iLMT and TAD4D use GSKit for SSL/TLS connections. The GSKit implementation is 
vulnerable to an attack from a malformed certificate chain. Were an attacker 
to use such a certificate when initiating an SSL/TLS connection, they could 
cause the iLMT/TAD4D server process to hang or crash.

The attack does not require local network access or authentication but 
specialized knowledge and techniques are required. An exploit would not impact 
the confidentiality of information or the integrity of data, however 
availability of the system can be compromised.

AFFECTED PRODUCTS AND VERSIONS:

7.1.x, 7.2.x and 7.5.x

REMEDIATION:

Update the system with the latest Interim Fixes available from Passport 
Advantage.

7.5.x:

* TAD4D 7.5.0.10 -> http://www-01.ibm.com/support/docview.wss?uid=swg24033014

* ILMT 7.5.0.10 -> http://www-01.ibm.com/support/docview.wss?uid=swg24032909

7.2.2:

* TAD4D 7.2.2 -> http://www-01.ibm.com/support/docview.wss?uid=swg24032997

* LMT 7.2.2 -> http://www-01.ibm.com/support/docview.wss?uid=swg24032962

earlier then 7.2.2:

* Contact the support.

WORKAROUND:

None.

MITIGATION:

None.

REFERENCES:

Complete CVSS Guide: http://www.first.org/cvss/cvss-guide.html
X-Force Vulnerability Database: http://xforce.iss.net/xforce/xfdb/89863
MITRE: http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2013-6747

RELATED INFORMATION:

IBM Secure Engineering Web Portal IBM Product Security Incident Response Blog

References
Complete CVSS Guide
On-line Calculator V2

Related information
IBM Secure Engineering Web Portal
IBM Product Security Incident Response Blog

*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.

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