Description
Netty is an asynchronous, event-driven network application framework. Prior to 4.2.13.Final and 4.1.133.Final, HttpObjectDecoder strips a conflicting Content-Length header when a request carries both Transfer-Encoding: chunked and Content-Length, but only for HTTP/1.1 messages. The guard is absent for HTTP/1.0. An attacker that sends an HTTP/1.0 request with both headers causes Netty to decode the body as chunked while leaving Content-Length intact in the forwarded HttpMessage. Any downstream proxy or handler that trusts Content-Length over Transfer-Encoding will disagree on message boundaries, enabling request smuggling. This vulnerability is fixed in 4.2.13.Final and 4.1.133.Final.
Problem types
CWE-444: Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling')
Product status
< 4.1.133.Final
References
github.com/.../netty/security/advisories/GHSA-xxqh-mfjm-7mv9
github.com/.../netty/security/advisories/GHSA-xxqh-mfjm-7mv9