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<h2 id="S2024-Summary">Summary</h2><span class="conf-macro output-inline" data-hasbody="true" data-macro-name="excerpt">Wrong <code>excludeParams</code> overrides those defined in <code>DefaultExcludedPatternsChecker</code></span><div class="table-wrap"><table class="confluenceTable"><tbody><tr><th class="confluenceTh"><p>Who should read this</p></th><td class="confluenceTd"><p>All Struts 2 developers and users</p></td></tr><tr><th class="confluenceTh"><p>Impact of vulnerability</p></th><td class="confluenceTd"><p>If default settings are used, the attacker can compromise internal state of an application</p></td></tr><tr><th class="confluenceTh"><p>Maximum security rating</p></th><td class="confluenceTd"><p>Medium</p></td></tr><tr><th class="confluenceTh"><p>Recommendation</p></th><td class="confluenceTd"><p>Developers should immediately upgrade to <a href="download.html#struts23201" class="external-link" rel="nofollow">Struts 2.3.20.1</a> or introduce the below change in framework's settings</p></td></tr><tr><th class="confluenceTh"><p>Affected Software</p></th><td class="confluenceTd"><p>Struts 2.3.20</p></td></tr><tr><th class="confluenceTh"><p>Reporter</p></th><td class="confluenceTd"><p>Jasper Rosenberg at Cargurus</p></td></tr><tr><th class="confluenceTh"><p>CVE Identifier</p></th><td class="confluenceTd"><p>CVE-2015-1831</p></td></tr></tbody></table></div><h2 id="S2024-Problem">Problem</h2><p><span style="color: rgb(34,34,34);">Wrong default exclude patterns were introduced in version 2.3.20 of Struts, if default settings are used, the attacker can compromise internal application's state.</span></p><h2 id="S2024-Solution">Solution</h2><p>In Struts 2.3.20.1 a better set of exlude patterns was defined.</p><h2 id="S2024-Backwardcompatibility">Backward compatibility</h2><p>No backward compatibility problems are expected.</p><h2 id="S2024-Workaround">Workaround</h2><p>If you cannot migrate to the latest version it's highly recommended to re-define <code>defaultStack</code> from <code>struts-default.xml</code> to this one below (or any other which is used in your application and drop <code>excludeParams</code> parameter):</p><div class="code panel pdl conf-macro output-block" style="border-width: 1px;" data-hasbody="true" data-macro-name="code"><div class="codeHeader panelHeader pdl" style="border-bottom-width: 1px;"><b>Redefined defaultStack</b></div><div class="codeContent panelContent pdl">
<pre class="syntaxhighlighter-pre" data-syntaxhighlighter-params="brush: xml; gutter: false; theme: Default" data-theme="Default"><interceptor-stack name="myDefaultStack">
<interceptor-ref name="exception"/>
<interceptor-ref name="alias"/>
<interceptor-ref name="servletConfig"/>
<interceptor-ref name="i18n"/>
<interceptor-ref name="prepare"/>
<interceptor-ref name="chain"/>
<interceptor-ref name="scopedModelDriven"/>
<interceptor-ref name="modelDriven"/>
<interceptor-ref name="fileUpload"/>
<interceptor-ref name="checkbox"/>
<interceptor-ref name="datetime"/>
<interceptor-ref name="multiselect"/>
<interceptor-ref name="staticParams"/>
<interceptor-ref name="actionMappingParams"/>
<interceptor-ref name="params"/>
<interceptor-ref name="conversionError"/>
<interceptor-ref name="validation">
<param name="excludeMethods">input,back,cancel,browse</param>
</interceptor-ref>
<interceptor-ref name="workflow">
<param name="excludeMethods">input,back,cancel,browse</param>
</interceptor-ref>
<interceptor-ref name="debugging"/>
<interceptor-ref name="deprecation"/>
</interceptor-stack></pre>
</div></div><p>and define the following constant in <code>struts.xml</code></p><div class="code panel pdl conf-macro output-block" style="border-width: 1px;" data-hasbody="true" data-macro-name="code"><div class="codeContent panelContent pdl">
<pre class="syntaxhighlighter-pre" data-syntaxhighlighter-params="brush: xml; gutter: false; theme: Default" data-theme="Default"><constant name="struts.additional.excludedPatterns" value="^(action|method):.*"/></pre>
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