IBM has acknowledged some vulnerabilities in IBM WebSphere Application Server for z/OS, which can be exploited by malicious, local users to potentially disclose sensitive information and by malicious people to disclose potentially sensitive information, manipulate certain data, cause a DoS (Denial of Service), and potentially compromise a vulnerable system.

1) Sensitive information may be written to the trace log file in cleartext when full SIP (Session Initiation Protocol) tracing is enabled and users connect using Basic authentication.

2) An error in multi-threaded Multi-Processing Module (MPM) can be exploited to disclose potentially sensitive information.

For more information see vulnerability #3:
SA38776

3) A vulnerability in the TLS protocol while handling session re-negotiations can be exploited to manipulate certain data.

For more information see vulnerability #1:
SA37291

4) A vulnerability in mod_proxy_ajp module can be exploited to cause a DoS (Denial of Service).

For more information see vulnerability #1:
SA38776

5) An error in mod_isapi module can be exploited to compromise a vulnerable system.

For more information see vulnerability #2:
SA38776

NOTE: Certain sensitive information may also be disclosed when running in debugging mode using the "-trace" option.

Solution
Apply APAR PM12247 or Fix Pack 6.1.0.31.
Changelog
Further details available in Customer Area

Original Advisory
IBM (PM12247):
http://www-01.ibm.com/support/docview.wss?uid=swg1PM12247
http://www-01.ibm.com/support/docview.wss?uid=swg27007951

Other references
Further details available in Customer Area

Deep Links
Links available in Customer Area