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<h2 id="S2018-Summary">Summary</h2>
<p>
<p class="conf-macro output-inline" data-hasbody="true" data-macro-name="excerpt">Broken Access Control Vulnerability in Apache Struts2</p>
<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> Permissions, Privileges, and Access Controls </p></td>
</tr>
<tr>
<th class="confluenceTh"><p> Maximum security rating </p></th>
<td class="confluenceTd"><p> Important </p></td>
</tr>
<tr>
<th class="confluenceTh"><p> Recommendation </p></th>
<td class="confluenceTd"><p> Developers should immediately upgrade to <a href="download.html#struts23152" class="external-link" rel="nofollow">Struts 2.3.15.3</a> </p></td>
</tr>
<tr>
<th class="confluenceTh"><p> Affected Software </p></th>
<td class="confluenceTd"><p> Struts 2.0.0 - Struts 2.3.15.2 </p></td>
</tr>
<tr>
<th class="confluenceTh"><p> Reporter </p></th>
<td class="confluenceTd"><p> Zhu Gang, Zhang Jin, Huawei PSIRT </p></td>
</tr>
<tr>
<th class="confluenceTh"><p> CVE Identifier </p></th>
<td class="confluenceTd"><p> <a href="javascript:;" class="external-link" rel="nofollow">CVE-2013-4310</a> </p></td>
</tr>
</tbody></table></div>
<h2 id="S2018-Problem">Problem</h2>
<p>The Struts 2 action mapping mechanism supports the special parameter prefix action: which is intended to help with attaching navigational information to buttons within forms.</p>
<p>In Struts 2 before 2.3.15.3, under certain conditions this can be used to bypass security constraints. More details will available later on when the patch will be widely adopted.</p>
<h2 id="S2018-Solution">Solution</h2>
<p>In Struts 2.3.15.3 the action mapping mechanism was changed to avoid circumventing security constraints. Two additional constants were introduced to steer behaviour of DefaultActionMapper:</p>
<ul class="alternate">
<li>struts.mapper.action.prefix.enabled - when set to false support for "action:" prefix is disabled, set to false by default</li>
<li>struts.mapper.action.prefix.crossNamespaces - when set to false, actions defined with "action:" prefix must be in the same namespace as current action</li>
</ul>
<div class="confluence-information-macro confluence-information-macro-note conf-macro output-block" data-hasbody="true" data-macro-name="note"><p class="title">Backward Compatibility</p><span class="aui-icon aui-icon-small aui-iconfont-warning confluence-information-macro-icon"> </span><div class="confluence-information-macro-body">
<p>After upgrading to Struts 2.3.15.3, applications using the "action:" will stop working. You can use above constants to steer that behaviour.</p></div></div>
<div class="confluence-information-macro confluence-information-macro-warning conf-macro output-block" data-hasbody="true" data-macro-name="warning"><span class="aui-icon aui-icon-small aui-iconfont-error confluence-information-macro-icon"> </span><div class="confluence-information-macro-body">
<p><strong>It is strongly recommended to upgrade to</strong> <strong><a href="download.html#struts23153" class="external-link" rel="nofollow">Struts 2.3.15.3</a></strong><strong>, which contains the corrected Struts2-Core library.</strong></p></div></div>
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