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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="S2021-Summary">Summary</h2>Improves excluded params in ParametersInterceptor and CookieInterceptor to avoid ClassLoader manipulation<div class="table-wrap"><table class="wrapped 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>ClassLoader manipulation</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>Developers should immediately upgrade to <a href="download.html#struts2320" class="external-link" rel="nofollow">Struts 2.3.20</a></p></td></tr><tr><th class="confluenceTh"><p>Affected Software</p></th><td class="confluenceTd"><p>Struts 2.0.0 - Struts 2.3.16.3</p></td></tr><tr><th class="confluenceTh"><p>Reporter</p></th><td class="confluenceTd"><p><span style="color: rgb(34,34,34);">NTT-CERT via JPCERT/CC</span>, <br>Takeshi Terada (Mitsui Bussan Secure Directions, Inc.), <br>Takayoshi Isayama (Mitsui Bussan Secure Directions, Inc.), <br>Yoshiyuki Karezaki (Yoshiyuki.Karezaki at scsk.jp)<br><span style="line-height: 1.4285715;">BAKA/ty (<span style="color: rgb(85,85,85);">121605589 at qq.com)</span>, <br></span><span style="line-height: 1.4285715;"><span style="color: rgb(34,34,34);">Nebula (</span><span style="color: rgb(34,34,34);">Chibi, Hubei, CN</span><span style="color: rgb(34,34,34);">), HelloWorld security team</span>, <br>NSFOCUS Security Team,<br></span><span style="line-height: 1.4285715;">heige (zhoujp at knownsec.com</span>)</p></td></tr><tr><th class="confluenceTh"><p>CVE Identifier</p></th><td class="confluenceTd"><p><span>CVE-2014-0112 - </span>Incomplete fix for ClassLoader manipulation via ParametersInterceptor</p><p><span>CVE-2014-0113 - </span>ClassLoader manipulation via CookieInterceptor when configured to accept all cookies</p></td></tr></tbody></table></div><h2 id="S2021-Problem">Problem</h2><p>The excluded parameter pattern introduced in version 2.3.16.1 to block access to getClass() method wasn't sufficient. It is possible to omit that with specially crafted requests. Also CookieInterceptor is vulnerable for the same kind of attack when it was configured to accept all cookies (when "*" is used to configure <code>cookiesName</code> param).</p><h2 id="S2021-Solution">Solution</h2><p>In Struts 2.3.20 improved "class" pattern was introduced directly to ParametersInterceptor and CookieInterceptor.</p><h2 id="S2021-Backwardcompatibility">Backward compatibility</h2><p>No backward compatibility problems are expected.</p><h2 id="S2021-Workaround">Workaround</h2><h2 id="S2021-Ifyoucannotupgradetoversion2.3.20immediately-whichisstronglyadvised-youcanapplybelowworkarounds:"><span style="font-size: 14.0px;line-height: 1.4285715;">If you cannot upgrade to version 2.3.20 immediately - <strong>which is strongly advised -</strong> you can apply below workarounds:</span></h2><h3 id="S2021-Exclude'class'parameter"><span style="line-height: 1.5625;">Exclude 'class' parameter</span></h3><p>Replace the previous class related pattern with '(.*\.|^|.*|\[('|"))class(\.|('|")]|\[).*' on 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">(.*\.|^|.*|\[('|"))(c|C)lass(\.|('|")]|\[).*,^dojo\..*,^struts\..*,^session\..*,^request\..*,^application\..*,^servlet(Request|Response)\..*,^parameters\..*,^action:.*,^method:.*</param>
</interceptor-ref></pre>
</div></div><p>It isn't possible to do the same with CookieInterceptor, so don't use wildcard mapping to accept cookie names or implement your own version of CookieInterceptor based on code provided in Struts 2.3.20.</p><p>Please be aware that this workaround is not as complete as the corrections in Struts 2.3.20</p>
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