Description
Jetty is a Java based web server and servlet engine. Prior to versions 9.4.52, 10.0.16, 11.0.16, and 12.0.1, Jetty accepts the `+` character proceeding the content-length value in a HTTP/1 header field. This is more permissive than allowed by the RFC and other servers routinely reject such requests with 400 responses. There is no known exploit scenario, but it is conceivable that request smuggling could result if jetty is used in combination with a server that does not close the connection after sending such a 400 response. Versions 9.4.52, 10.0.16, 11.0.16, and 12.0.1 contain a patch for this issue. There is no workaround as there is no known exploit scenario.
Remediation
References
https://github.com/eclipse/jetty.project/security/advisories/GHSA-hmr7-m48g-48f6
https://lists.debian.org/debian-lts-announce/2023/09/msg00039.html
https://www.debian.org/security/2023/dsa-5507
https://www.rfc-editor.org/rfc/rfc9110#section-8.6
Related Vulnerabilities
CVE-2023-36665 Vulnerability in npm package protobufjs
CVE-2021-25122 Vulnerability in maven package org.apache.tomcat.embed:tomcat-embed-core
CVE-2023-40336 Vulnerability in maven package org.jenkins-ci.plugins:cloudbees-folder
CVE-2023-40348 Vulnerability in maven package org.jenkins-ci.plugins:gogs-webhook
CVE-2020-1938 Vulnerability in maven package org.apache.tomcat:tomcat-util