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AUSCERT External Security Bulletin Redistribution
ESB-2012.0932
Potential information disclosure vulnerability in TLS
compression with IBM HTTP Server
28 September 2012
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AusCERT Security Bulletin Summary
---------------------------------
Product: IBM WebSphere Application Server
IBM HTTP Server
Publisher: IBM
Operating System: AIX
HP-UX
Linux variants
Solaris
Windows
Impact/Access: Access Confidential Data -- Remote/Unauthenticated
Resolution: Patch/Upgrade
Original Bulletin:
http://www-01.ibm.com/support/docview.wss?uid=swg21611881
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Potential information disclosure vulnerability in TLS compression with IBM
HTTP Server (APAR PM72915)
Flash (Alert)
Document information
WebSphere Application Server
IBM HTTP Server
Software version:
8.0, 8.0.0.1, 8.0.0.2, 8.0.0.3, 8.0.0.4, 8.5
Operating system(s):
AIX, HP-UX, Linux, Solaris, Windows
Software edition:
Base, Developer, Enterprise, Express, Network Deployment
Reference #:
1611881
Modified date:
2012-09-27
Abstract
Plaintext httpOnly cookies from the session could be exposed due to a TLS
compression vulnerability.
Content
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 8.0.0.0 to 8.0.0.4, and 8.5.0.0.
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
system.
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 (8.0.0.5) or later (targeted to be available mid November 2012).
Fix pack 1 (8.5.0.1) or later (targeted to be available late October 2012).
Additional documentation:
For additional details and information on WebSphere Application Server product
updates:
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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