GHSA-m394-8rww-3jr7 DOS vulnerability for Quoted Quality CSV headers

• Maven org.eclipse.jetty:jetty-server: >= 9.4.6, < 9.4.37 → fixed in 9.4.37 • Maven org.eclipse.jetty:jetty-server: >= 10.0.0, < 10.0.1 → fixed in 10.0.1 • Maven org.eclipse.jetty:jetty-server: >= 11.0.0, < 11.0.1 → fixed in 11.0.1

Impact When Jetty handles a request containing request headers with a large number of “quality” (i.e. q) parameters (such as what are seen on the `Accept`, `Accept-Encoding`, and `Accept-Language` request headers), the server may enter a denial of service (DoS) state due to high CPU usage while sorting the list of values based on their quality values. A single request can easily consume minutes of CPU time before it is even dispatched to the application. The only features within Jetty that can trigger this behavior are: • Default Error Handling - the `Accept` request header with the `QuotedQualityCSV` is used to determine what kind of content to send back to the client (html, text, json, xml, etc) • `StatisticsServlet` - uses the `Accept` request header with the `QuotedQualityCSV` to determine what kind of content to send back to the client (xml, json, text, html, etc) • `HttpServletRequest.getLocale()` - uses the `Accept-Language` request header with the `QuotedQualityCSV` to determine which “preferred” language is returned on this call. • `HttpservletRequest.getLocales()` - is similar to the above, but returns an ordered list of locales based on the quality values on the `Accept-Language` request header. • `DefaultServlet` - uses the `Accept-Encoding` request header with the `QuotedQualityCSV` to determine which kind of pre-compressed content should be sent back for static content (content that is not matched against a url-pattern in your web app) Versions `QuotedQualityCSV` was introduced to Jetty 9.3.9.v20160517 and the bug that introduced the vulnerability was in 9.4.6.v20170531. Currently, known vulnerable versions include: • 9.4.6.v20170531 thru to 9.4.36.v20210114 • 10.0.0 • 11.0.0 Workarounds Quality ordered values are used infrequently by jetty so they can be avoided by: • Do not use the default error page/handler. • Do not deploy the `StatisticsServlet` exposed to the network • Do not call `getLocale` API • Do not enable precompressed static content in the `DefaultServlet` Patches All patches are available for download from the Eclipse Jetty website at https://www.eclipse.org/jetty/download.php • 9.4.37.v20210219 and greater • 10.0.1 and greater • 11.0.1 and greater