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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
Operating System: AIX
Impact/Access: Access Confidential Data -- Remote/Unauthenticated
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Potential information disclosure vulnerability in TLS compression with IBM
HTTP Server (APAR PM72915)
WebSphere Application Server
IBM HTTP Server
8.0, 184.108.40.206, 220.127.116.11, 18.104.22.168, 22.214.171.124, 8.5
AIX, HP-UX, Linux, Solaris, Windows
Base, Developer, Enterprise, Express, Network Deployment
Plaintext httpOnly cookies from the session could be exposed due to a TLS
The problem affects the Distributed IBM HTTP Server component in all editions
of WebSphere Application Server and bundling products:
IBM HTTP Server versions 126.96.36.199 to 188.8.131.52, and 184.108.40.206.
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 V220.127.116.11 through 8.0.x.x and V18.104.22.168:
Add SSLAttributeSet 445 1 to any context in the IHS configuration file that
already has the SSLEnable directive
Apply APAR Interim Fix APAR PM72915
Apply the appropriate Fix Pack for your version of IBM HTTP Server:
Fix Pack 5 (22.214.171.124) or later (targeted to be available mid November 2012).
Fix pack 1 (126.96.36.199) or later (targeted to be available late October 2012).
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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