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Apache Tomcat 6.x / 7.x Denial Of Service

Apache Tomcat 6.x / 7.x Denial Of Service
Posted Nov 6, 2012
Authored by Mark Thomas, Josh Spiewak | Site tomcat.apache.org

Apache Tomcat suffers from a denial of service vulnerability. The checks that limited the permitted size of request headers were implemented too late in the request parsing process for the HTTP NIO connector. This enabled a malicious user to trigger an OutOfMemoryError by sending a single request with very large headers. Tomcat versions 6.0.0 through 6.0.34 and 7.0.0 through 7.0.27 are affected.

tags | advisory, web, denial of service
advisories | CVE-2012-2733
MD5 | ed8ee85cd88703bc7c41431f7a4fa2e1

Apache Tomcat 6.x / 7.x Denial Of Service

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-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1

CVE-2012-2733 Apache Tomcat Denial of Service

Severity: Important

Vendor: The Apache Software Foundation

Versions Affected:
- - Tomcat 7.0.0 to 7.0.27
- - Tomcat 6.0.0 to 6.0.35

Description:
The checks that limited the permitted size of request headers were
implemented too late in the request parsing process for the HTTP NIO
connector. This enabled a malicious user to trigger an
OutOfMemoryError by sending a single request with very large headers.

Mitigation:
Users of affected versions should apply one of the following mitigations:
- - Tomcat 7.0.x users should upgrade to 7.0.28 or later
- - Tomcat 6.0.x users should upgrade to 6.0.36 or later

Credit:
This issue was identified by Josh Spiewak.

References:
http://tomcat.apache.org/security.html
http://tomcat.apache.org/security-7.html
http://tomcat.apache.org/security-6.html

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