QID 980249

QID 980249: Java (maven) Security Update for org.eclipse.jetty:jetty-webapp (GHSA-v7ff-8wcx-gmc5)

Release 9.4.37 introduced a more precise implementation of [RFC3986](https://tools.ietf.org/html/rfc3986#section-3.3) with regards to URI decoding, together with some new compliance modes to optionally allow support of some URI that may have ambiguous interpretation within the Servlet specified API methods behaviours. The default mode allowed % encoded . characters to be excluded for URI normalisation, which is correct by the RFC, but is not assumed by common Servlet implementations.

The default compliance mode allows requests with URIs that contain `%2e` or `%2e%2e` segments to access protected resources within the `WEB-INF` directory. For example a request to `/context/%2e/WEB-INF/web.xml` can retrieve the `web.xml` file. This can reveal sensitive information regarding the implementation of a web application.

CVSS V3 rated as Medium - 5.3 severity.

CVSS V2 rated as Medium - 5 severity.

Solution

Customers are advised to refer to GHSA-v7ff-8wcx-gmc5 for updates pertaining to this vulnerability.Workaround:
The HttpCompliance mode RFC7230_NO_AMBIGUOUS_URIS can be enabled by updating `start.d/http.ini` to include:
```
jetty.http.compliance=RFC7230_NO_AMBIGUOUS_URIS
```

Vendor References

GHSA-v7ff-8wcx-gmc5 - github.com/advisories/GHSA-v7ff-8wcx-gmc5

CVEs related to QID 980249

CVE-2021-28164 |

Software Advisories

Advisory ID	Software	Component	Link
GHSA-v7ff-8wcx-gmc5	org.eclipse.jetty:jetty-webapp		github.com/advisories/GHSA-v7ff-8wcx-gmc5

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