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由<span class='author'> <a href="~lukaszlenart.html" class="url fn">Lukasz Lenart</a></span>创建, 最终由<span class='editor'> <a href="~rgielen.html" class="url fn">René Gielen</a></span>修改于 <a class='last-modified' title='查看变更' href='javascript:;'>三月 19, 2017</a>
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<h2 id="S2045-Summary">Summary</h2>Possible Remote Code Execution when performing file upload based on Jakarta Multipart parser.<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>Possible RCE when performing file upload <span>based on Jakarta Multipart parser</span></p></td></tr><tr><th class="confluenceTh"><p>Maximum security rating</p></th><td class="confluenceTd"><p>Critical</p></td></tr><tr><th class="confluenceTh"><p>Recommendation</p></th><td class="confluenceTd"><p>Upgrade to <a href="javascript:;">Struts 2.3.32</a> or <a href="javascript:;">Struts 2.5.10.1</a></p></td></tr><tr><th class="confluenceTh"><p>Affected Software</p></th><td class="confluenceTd"><p>Struts 2.3.5 - Struts 2.3.31, Struts 2.5 -<span style="color: rgb(23,35,59);"> Struts 2.5.10</span></p></td></tr><tr><th class="confluenceTh"><p>Reporter</p></th><td class="confluenceTd"><p>Nike Zheng <nike dot zheng at dbappsecurity dot com dot cn></p></td></tr><tr><th class="confluenceTh"><p>CVE Identifier</p></th><td class="confluenceTd"><p>CVE-2017-5638</p></td></tr></tbody></table></div><h2 id="S2045-Problem">Problem</h2><p>It is possible to perform a RCE attack with a malicious <code>Content-Type</code> value. If the <code>Content-Type</code> value isn't valid an exception is thrown which is then used to display an error message to a user.</p><h2 id="S2045-Solution">Solution</h2><p>If you are using Jakarta based file upload Multipart parser, upgrade to Apache Struts version 2.3.32 or 2.5.10.1. You can also switch to a different <a href="javascript:;" rel="nofollow">implementation</a> of the Multipart parser.</p><h2 id="S2045-Backwardcompatibility">Backward compatibility</h2><p>No backward incompatibility issues are expected.</p><h2 id="S2045-Workaround">Workaround</h2><p>Implement a Servlet filter which will validate <code>Content-Type</code> and throw away request with suspicious values not matching <code>multipart/form-data</code>.</p><p>Other option is to remove the <a href="javascript:;">File Upload Interceptor</a> from the stack, just define your own custom stack and set it as a default - please read <a href="javascript:;">How do we configure an Interceptor to be used with every Action</a>. This will work only for Struts 2.5.8 - 2.5.10.</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: java; gutter: false; theme: Default" data-theme="Default"><interceptors>
<interceptor-stack name="defaultWithoutUpload">
<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="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-stack>
</interceptors>
<default-interceptor-ref name="defaultWithoutUpload"/></pre>
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