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Related Vulnerabilities: CVE-2021-28169

For Eclipse Jetty versions <= 9.4.40, <= 10.0.2, <= 11.0.2, it is possible for requests to the ConcatServlet with a doubly encoded path to access protected resources within the WEB-INF directory. For example a request to `/concat?/%2557EB-INF/web.xml` can retrieve the web.xml file. This can reveal sensitive information regarding the implementation of a web application.

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The MITRE CVE dictionary describes this issue as:

For Eclipse Jetty versions <= 9.4.40, <= 10.0.2, <= 11.0.2, it is possible for requests to the ConcatServlet with a doubly encoded path to access protected resources within the WEB-INF directory. For example a request to `/concat?/%2557EB-INF/web.xml` can retrieve the web.xml file. This can reveal sensitive information regarding the implementation of a web application.

Additional Information

Bugzilla 1971016: CVE-2021-28169 jetty: requests to the ConcatServlet and WelcomeFilter are able to access protected resources within the WEB-INF directory
CWE-200: Exposure of Sensitive Information to an Unauthorized Actor
FAQ: Frequently asked questions about CVE-2021-28169

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CVE-2021-28169

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