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CVE-2014-0050 Apache Commons FileUpload and Apache Tomcat DoS

Severity: Important

Vendor: The Apache Software Foundation

Versions Affected:
- - Commons FileUpload 1.0 to 1.3
- - Apache Tomcat 8.0.0-RC1 to 8.0.1
- - Apache Tomcat 7.0.0 to 7.0.50
- - Apache Tomcat 6 and earlier are not affected

Apache Tomcat 7 and Apache Tomcat 8 use a packaged renamed copy of
Apache Commons FileUpload to implement the requirement of the Servlet
3.0 and later specifications to support the processing of
mime-multipart requests. Tomcat 7 and 8 are therefore affected by this
issue. While Tomcat 6 uses Commons FileUpload as part of the Manager
application, access to that functionality is limited to authenticated
administrators.

Description:
It is possible to craft a malformed Content-Type header for a
multipart request that causes Apache Commons FileUpload to enter an
infinite loop. A malicious user could, therefore, craft a malformed
request that triggered a denial of service.
This issue was reported responsibly to the Apache Software Foundation
via JPCERT but an error in addressing an e-mail led to the unintended
early disclosure of this issue[1].

Mitigation:
Users of affected versions should apply one of the following mitigations
- - Upgrade to Apache Commons FileUpload 1.3.1 or later once released
- - Upgrade to Apache Tomcat 8.0.2 or later once released
- - Upgrade to Apache Tomcat 7.0.51 or later once released
- - Apply the appropriate patch
  - Commons FileUpload: http://svn.apache.org/r1565143
  - Tomcat 8: http://svn.apache.org/r1565163
  - Tomcat 7: http://svn.apache.org/r1565169
- - Limit the size of the Content-Type header to less than 4091 bytes

Credit:
This issue was reported to the Apache Software Foundation via JPCERT.

References:
[1] http://markmail.org/message/kpfl7ax4el2owb3o
[2] http://tomcat.apache.org/security-8.html
[3] http://tomcat.apache.org/security-7.html
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