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             AUSCERT External Security Bulletin Redistribution

           Potential information disclosure vulnerability in TLS
                     compression with IBM HTTP Server
                             28 September 2012


        AusCERT Security Bulletin Summary

Product:           IBM WebSphere Application Server
                   IBM HTTP Server
Publisher:         IBM
Operating System:  AIX
                   Linux variants
Impact/Access:     Access Confidential Data -- Remote/Unauthenticated
Resolution:        Patch/Upgrade

Original Bulletin: 

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

Potential information disclosure vulnerability in TLS compression with IBM 
HTTP Server (APAR PM72915) 

Flash (Alert)

Document information

WebSphere Application Server


Software version:
8.0,,,,, 8.5

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

Software edition:
Base, Developer, Enterprise, Express, Network Deployment

Reference #:

Modified date:


Plaintext httpOnly cookies from the session could be exposed due to a TLS 
compression vulnerability. 


Affected Versions:

The problem affects the Distributed IBM HTTP Server component in all editions
of WebSphere Application Server and bundling products:

IBM HTTP Server versions to, and

Note: The SSL transport in the WebSphere Application Server is not affected. 
Only the bundled IBM HTTP Server is affected.

The problem does not occur on the following versions:

IBM HTTP Server on z/OS, i5/OS, or IBM i operating systems. 
IBM HTTP Server versions 7.0, 6.1, 6.0, 2.0.x, or 1.3.x on any operating 

Problem Description: IBM HTTP Server 8.0, and later, supports TLS compression,
and inadvertently has it enabled by default. Due to a vulnerability in TLS 
compression, IBM HTTP Server with SSL enabled could potentially expose 
plaintext httpOnly cookies from the session to an attacker.

Solution: For affected versions of IBM HTTP Server:

For V8.0.0.0 through 8.0.x.x and V8.5.0.0: 
Add SSLAttributeSet 445 1 to any context in the IHS configuration file that 
already has the SSLEnable directive 
- --OR-- 
Apply APAR Interim Fix APAR PM72915 
- --OR-- 
Apply the appropriate Fix Pack for your version of IBM HTTP Server: 
Fix Pack 5 ( or later (targeted to be available mid November 2012). 
Fix pack 1 ( or later (targeted to be available late October 2012).

Additional documentation: 
For additional details and information on WebSphere Application Server product 

    For Distributed, see Recommended fixes for WebSphere Application Server.

Cross reference information 
Segment 		Product 			Component 	Platform 	Version Edition
Application Servers 	WebSphere Application 		General 	AIX, Linux 	8.0 	All Editions
			Server Hypervisor Edition 

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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