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<h2 id="S2048-Summary">Summary</h2>Possible RCE in the Struts Showcase app in the Struts 1 plugin example in Struts 2.3.x series<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 should read this</p></td></tr><tr><th class="confluenceTh"><p>Impact of vulnerability</p></th><td class="confluenceTd"><p>Possible RCE when using the Struts 2 Struts 1 plugin</p></td></tr><tr><th class="confluenceTh"><p>Maximum security rating</p></th><td class="confluenceTd"><p>High</p></td></tr><tr><th class="confluenceTh"><p>Recommendation</p></th><td class="confluenceTd"><p>Please read the Solution section</p></td></tr><tr><th class="confluenceTh"><p>Affected Software</p></th><td class="confluenceTd"><p>Struts 2.3.x with Struts 1 plugin and Struts 1 action</p></td></tr><tr><th class="confluenceTh"><p>Reporter</p></th><td class="confluenceTd"><p>icez <ic3z at qq dot com> from Tophant Competence Center</p></td></tr><tr><th class="confluenceTh"><p>CVE Identifier</p></th><td class="confluenceTd"><p>CVE-2017-9791</p></td></tr></tbody></table></div><h2 id="S2048-Problem">Problem</h2><p>It is possible to perform a RCE attack with a malicious field value when using the Struts 2 Struts 1 plugin and it's a Struts 1 action and the value is a part of a message presented to the user, i.e. when using untrusted input as a part of the error message in the <code>ActionMessage </code>class.</p><h2 id="S2048-Solution">Solution</h2><p>Always use resource keys instead of passing a raw message to the <code>ActionMessage </code>as shown below, never pass a raw value directly</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">messages.add("msg", new ActionMessage("struts1.gangsterAdded", gform.getName()));</pre>
</div></div><p>and never like this</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">messages.add("msg", new ActionMessage("Gangster " + gform.getName() + " was added"));</pre>
</div></div><h2 id="S2048-Backwardcompatibility">Backward compatibility</h2><p>No backward incompatibility issues are expected.</p><p> </p>
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