QID 980212

QID 980212: Java (maven) Security Update for org.eclipse.jetty:jetty-webapp (GHSA-vjv5-gp2w-65vm)

URIs can be crafted using some encoded characters to access the content of the `WEB-INF` directory and/or bypass some security constraints.
This is a variation of the vulnerability reported in [CVE-2021-28164](https://nvd.nist.gov/vuln/detail/CVE-2021-28164)/[GHSA-v7ff-8wcx-gmc5](https://github.com/eclipse/jetty.project/security/advisories/GHSA-v7ff-8wcx-gmc5).

The default compliance mode allows requests with URIs that contain a %u002e segment to access protected resources within the WEB-INF directory. For example, a request to `/%u002e/WEB-INF/web.xml` can retrieve the web.xml file. This can reveal sensitive information regarding the implementation of a web application. Similarly, an encoded null character can prevent correct normalization so that /.%00/WEB-INF/web.xml cal also retrieve the web.xml file.

  • CVSS V3 rated as Medium - 5.3 severity.
  • CVSS V2 rated as Medium - 5 severity.
    • Solution
    Customers are advised to refer to GHSA-vjv5-gp2w-65vm for updates pertaining to this vulnerability.Workaround:
    Some Jetty [rewrite rules](https://www.eclipse.org/jetty/documentation/jetty-9/index.html#rewrite-handler) can be deployed to rewrite any request containing encoded dot segments or null characters in the raw request URI, to a known not found resource:
    ```xml
    <Call name="addRule">
    <Arg>
    <New class="org.eclipse.jetty.rewrite.handler.RewriteRegexRule">
    <Set name="regex">.*/(?:\.+/)+.*</Set>
    <Set name="replacement">/WEB-INF/Not-Found</Set>
    </New>
    </Arg>
    </Call>
    <Call name="addRule">
    <Arg>
    <New class="org.eclipse.jetty.rewrite.handler.ValidUrlRule"/>
    </Arg>
    </Call>
    ```
    Vendor References

    CVEs related to QID 980212

    CVE-2021-34429 |
    Software Advisories
    Advisory ID Software Component Link
    GHSA-vjv5-gp2w-65vm org.eclipse.jetty:jetty-webapp URL Logo github.com/advisories/GHSA-vjv5-gp2w-65vm
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