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CVE-2021-28169

Jetty Utility Servlets ConcatServlet Double Decoding Information Disclosure Vulnerability

概要

Jetty Utility Servlets ConcatServlet Double Decoding Information Disclosure Vulnerability

原文の説明

取得元が公開している説明をそのまま載せています (多くは英語)。

Requests to the ConcatServlet and WelcomeFilter are able to access protected resources within the WEB-INF directory. For example a request to the ConcatServlet with a URI of /concat?/%2557EB-INF/web.xml can retrieve the web.xml file. This can reveal sensitive information regarding the implementation of a web application.

This occurs because both ConcatServlet and WelcomeFilter decode the supplied path to verify it is not within the WEB-INF or META-INF directories. It then uses this decoded path to call RequestDispatcher which will also do decoding of the path. This double decoding allows paths with a doubly encoded WEB-INF to bypass this security check.

Impact

This affects all versions of ConcatServlet and WelcomeFilter in versions before 9.4.41, 10.0.3 and 11.0.3.

Workarounds

If you cannot update to the latest version of Jetty, you can instead deploy your own version of the ConcatServlet and/or the WelcomeFilter by using the code from the latest version of Jetty.

出典: OSV.dev (Open Source Vulnerabilities) NVD GitHub Advisory OSV

影響パッケージ

Maven org.eclipse.jetty:jetty-servlets
[{"type":"ECOSYSTEM","events":[{"introduced":"11.0.0"},{"fixed":"11.0.3"}]}]

ディストリビューション別の修正状況

各ディストリビューションが公開している、この CVE の修正パッケージ

参照URL

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