GHSA-gv3v-92v6-m48j Improper Neutralization of CRLF Sequences in HTTP Headers in Jooby ('HTTP Response Splitting)

• Maven io.jooby:jooby-netty: < 2.2.1 → fixed in 2.2.1

Impact • Cross Site Scripting • Cache Poisoning • Page Hijacking Patches This was fixed in version `2.2.1`. Workarounds If you are unable to update, ensure that user supplied data isn't able to flow to HTTP headers. If it does, pre-sanitize for CRLF characters. References CWE-113: Improper Neutralization of CRLF Sequences in HTTP Headers ('HTTP Response Splitting') I've been poking at libraries to see if they are vulnerable to HTTP Response Splitting and Jooby is my third case of finding this vulnerability. Root Cause This roots cause back to this line in the Jooby codebase: https://github.com/jooby-project/jooby/blob/93cfc80aa20c188f71a442ea7a1827da380e1c27/modules/jooby-netty/src/main/java/io/jooby/internal/netty/NettyContext.java#L102 The `DefaultHttpHeaders` takes a parameter `validate` which, when `true` (as it is for the no-arg constructor) validates that the header isn't being abused to do HTTP Response Splitting. Reported By This vulnerability was reported by @JLLeitschuh (Twitter) For more information If you have any questions or comments about this advisory: • Open an issue in jooby-project/jooby