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Apache Tomcat 8.x / 9.x Refactoring Information Disclosure

Apache Tomcat 8.x / 9.x Refactoring Information Disclosure
Posted Apr 10, 2017
Authored by Mark Thomas | Site tomcat.apache.org

The refactoring of the HTTP connectors for 8.5.x onwards, introduced a regression in the send file processing. If the send file processing completed quickly, it was possible for the Processor to be added to the processor cache twice. This could result in the same Processor being used for multiple requests which in turn could lead to unexpected errors and/or response mix-up. Apache Tomcat versions 8.5.0 through 8.5.12 and 9.0.0.M1 through 9.0.0.M18 are affected.

tags | advisory, web
advisories | CVE-2017-5651
SHA-256 | 9e9a2ed68a0484d3c5eedcf6b96e3c1f556c0d256bfd0937b7b5acc81297e9ef

Apache Tomcat 8.x / 9.x Refactoring Information Disclosure

Change Mirror Download
CVE-2017-5651 Apache Tomcat Information Disclosure

Severity: Important

Vendor: The Apache Software Foundation

Versions Affected:
Apache Tomcat 9.0.0.M1 to 9.0.0.M18
Apache Tomcat 8.5.0 to 8.5.12
Apache Tomcat 8.0.x and earlier are not affected

Description:
The refactoring of the HTTP connectors for 8.5.x onwards, introduced a
regression in the send file processing. If the send file processing
completed quickly, it was possible for the Processor to be added to the
processor cache twice. This could result in the same Processor being
used for multiple requests which in turn could lead to unexpected errors
and/or response mix-up.

Mitigation:
Users of the affected versions should apply one of the following
mitigations:
- Upgrade to Apache Tomcat 9.0.0.M19 or later
- Upgrade to Apache Tomcat 8.5.13 or later

Credit:
This issue was reported publicly as Bug 60918 [1] and the security
implications identified by the Tomcat security team.

History:
2017-04-10 Original advisory

References:
[1] https://bz.apache.org/bugzilla/show_bug.cgi?id=60918
[2] http://tomcat.apache.org/security-9.html
[3] http://tomcat.apache.org/security-8.html
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