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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:;'>八月 08, 2019</a>
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<h2 id="S2020-Summary">Summary</h2>Upgrade Commons FileUpload to version 1.3.1 (avoids DoS attacks) and adds 'class' to exclude params in ParametersInterceptor (avoid ClassLoader manipulation)<div class="table-wrap"><table class="confluenceTable"><colgroup><col><col></colgroup><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>DoS attacks and ClassLoader manipulation</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#struts23161" class="external-link" rel="nofollow">Struts 2.3.16.2</a></p></td></tr><tr><th class="confluenceTh"><p>Affected Software</p></th><td class="confluenceTd"><p>Struts 2.0.0 - Struts 2.3.16.1</p></td></tr><tr><th class="confluenceTh"><p>Reporter</p></th><td class="confluenceTd"><p>Peter Magnusson (peter.magnusson at omegapoint.se), Przemysław Celej (p-celej at o2.pl)</p></td></tr><tr><th class="confluenceTh"><p>CVE Identifier</p></th><td class="confluenceTd"><p>CVE-2014-0050 (DoS), CVE-2014-0094 (ClassLoader manipulation)</p></td></tr></tbody></table></div><h2 id="S2020-Problem">Problem</h2><p>The default upload mechanism in Apache Struts 2 is based on Commons FileUpload version 1.3 which is vulnerable and allows DoS attacks. Additional ParametersInterceptor allows access to 'class' parameter which is directly mapped to getClass() method and allows ClassLoader manipulation.</p><h2 id="S2020-Solution">Solution</h2><p>In Struts 2.3.16.1, Commons FileUpload was updated to version 1.3.1 and "class" was added to excludeParams in struts-default.xml configuration of ParametersInterceptor.</p><h2 id="S2020-Backwardcompatibility">Backward compatibility</h2><p>No backward compatibility problems are expected.</p><h2 id="S2020-Workaround">Workaround</h2><p>If you cannot upgrade to version 2.3.16.2 which is strongly advised, you can apply below workarounds:</p><h3 id="S2020-Upgradecommons-fileupload">Upgrade commons-fileupload</h3><p><span style="color: rgb(34,34,34);">The fixed </span><span style="color: rgb(34,34,34);">commons-fileupload library is a drop-in replacement for the vulnerable </span><span style="color: rgb(34,34,34);">version. Deployed applications can be hardened by replacing the </span><span style="color: rgb(34,34,34);">commons-fileupload jar file in WEB-INF/lib with the updated jar. For Maven</span><br><span style="color: rgb(34,34,34);">based Struts 2 projects, the following dependency needs to be added:</span></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"><dependency>
<groupId>commons-fileupload</groupId>
<artifactId>commons-fileupload</artifactId>
<version>1.3.1</version>
</dependency></pre>
</div></div><h3 id="S2020-Exclude'class'parameter">Exclude 'class' parameter</h3><p>Simple add '^class\.*' to the list of excludeParams as below</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"><interceptor-ref name="params">
<param name="excludeParams">^class\..*,^dojo\..*,^struts\..*,^session\..*,^request\..*,^application\..*,^servlet(Request|Response)\..*,^parameters\..*,^action:.*,^method:.*</param>
</interceptor-ref></pre>
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