S2-011
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Summary

Long request parameter names might significantly promote the effectiveness of DOS attacks

Who should read this

All Struts 2 developers

Impact of vulnerability

Denial-of-Service attacks

Maximum security rating

Important

Recommendation

Developers should upgrade to Struts 2.3.4.1

Affected Software

Struts 2.0.0 - Struts 2.3.4

Original JIRA Tickets

WW-3860

Reporter

Johno Crawford

CVE Identifier

CVE-2012-4387

Problem

Request parameters handled by Struts 2 are effectively treated as OGNL expressions. A possible DOS attacker might craft requests to a Struts 2 based application with extremely long parameter names. OGNL evaluation of the parameter name then will consume significant CPU cycles, thus promoting the effectiveness of the DOS attack.

Solution

As of Struts 2.3.4.1, parameter name length is limited to a maximum of 100 characters. This configuration may be customized by providing the newly introduced parameter "paramNameMaxLength" to the ParametersInteceptor configuration.

Thanks to Johno Crawford for the provided patch.

Please upgrade to Struts 2.3.4.1.

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