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             AUSCERT External Security Bulletin Redistribution

                               ESB-2012.0926
Security Bulletin: Potential Denial of Service (DoS) security vulnerability
              in IBM Sterling External Authentication Server
                             27 September 2012

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

Product:           IBM Sterling External Authentication Server
Publisher:         IBM
Operating System:  AIX
                   HP-UX
                   Linux variants
                   Solaris
                   Windows
Impact/Access:     Denial of Service -- Remote/Unauthenticated
Resolution:        Patch/Upgrade
CVE Names:         CVE-2011-4461  

Original Bulletin: 
   http://www-01.ibm.com/support/docview.wss?uid=swg21611913

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Security Bulletin: Potential Denial of Service (DoS) security vulnerability in
IBM Sterling External Authentication Server 

Flash (Alert)

Document information

Sterling Secure Proxy

External Authentication Server

Software version:
3.3, 3.3.1, 3.4

Operating system(s):
AIX, HP-UX, Linux, Solaris, Windows

Reference #:
1611913

Modified date:
2012-09-21

Abstract

Potential Denial of Service (DoS) security vulnerability in IBM Sterling 
External Authentication Server due to a Java HashTable security vulnerability
in Jetty (CVE-2011-4461). 

Content

SUMMARY: Potential Denial of Service (Dos) security vulnerability in IBM 
Sterling External Authentication Server due to multiple Java HashTable 
security vulnerabilities in the embedded Jetty web server.

VULNERABILITY DETAILS:

    CVE ID: CVE-2011-4461

DESCRIPTION: IBM Sterling External Authentication Server is potentially 
vulnerable to Denial of Service attacks because one of its embedded 
components, Jetty, has multiple security vulnerability. The vulnerability is 
caused by insufficient randomization of hash data structures. A remote 
attacker could exploit this vulnerability to cause the consumption of CPU 
resources. Customers who are using IBM Sterling External Authentication Server
may be impacted by this Jetty vulnerability which can cause performance or 
Denial of Service (DoS) issues.

CVSS: CVSS Base Score: 2 

CVSS Temporal Score: See http://xforce.iss.net/xforce/xfdb/72017 for the 
current score CVSS 
Environmental Score*: Undefined 
CVSS String: (AV:N/AC:L/Au:N/C:N/I:N/A:P)

AFFECTED VERSIONS:

The following IBM Sterling External Authentication Server Versions are 
affected: Version 2.2.00 through 2.2.0.2 Version 2.3.1.0 through 2.3.1.9 
Version 2.4.0.0 through 2.4.0.2 Version 2.4.1.0 (GA)

REMEDIATION:

The recommended solution is to apply the fix for each version as soon as 
practical. See below for information on fixes available.

For V2.2.0.0 through 2.3.1.9:

Install Fix Pack 10 (2.3.1.10), or later, if your environment is not 
already at this level. Customers at releases prior to SEAS 2.3.1 should use 
this Fix Pack to upgrade to SEAS 2.3.1.10.

For V2.4.0.0 through 2.4.0.4:

Install Fix Pack 3 (2.4.0.3) or later, if your environment is not already
at this level.

For V2.4.1.0 through 2.4.1.4:

Install Fix Pack 1 (2.4.1.1).

WORKAROUND(S): None known; apply fixes

MITIGATION(S): None known

REFERENCES: Complete CVSS Guide On-line Calculator V2 X-Force Vulnerability 
Database CVE-2011-4461

For more information see: http://www.ocert.org/advisories/ocert-2011-003.html
http://www.kb.cert.org/vuls/id/903934 
http://www.nruns.com/_downloads/advisory28122011.pdf Patch: 
https://bugzilla.redhat.com/show_bug.cgi?id=781677

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 Flash.

Note: 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

Copyright and trademark information

IBM, the IBM logo and ibm.com are trademarks of International Business 
Machines Corp., registered in many jurisdictions worldwide. Other product and
service names might be trademarks of IBM or other companies. A current list of
IBM trademarks is available on the Web at "Copyright and trademark 
information" at www.ibm.com/legal/copytrade.shtml.

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