Improper Neutralization of CRLF Sequences in HTTP Headers ('HTTP Response Splitting') in Armeria

Versions of Armeria 0.85.0 through and including 0.96.0 are vulnerable to HTTP response splitting, which allows remote attackers to inject arbitrary HTTP headers via CRLF sequences when unsanitized data is used to populate the headers of an HTTP response.

Impact

1. Cross-User Defacement
2. Cache Poisoning
3. Cross-Site Scripting (XSS)
4. Page Hijacking

Root Cause

The root cause is due to the usage of Netty without the HTTP header validation.

https://github.com/line/armeria/blob/f0d870fde1088114070be31b67f7df0a21e835c6/core/src/main/java/com/linecorp/armeria/common/DefaultHttpHeaders.java#L23

Patches

This vulnerability has been patched in 0.97.0.

References

CWE-113: Improper Neutralization of CRLF Sequences in HTTP Headers (‘HTTP Response Splitting’)
https://github.com/ratpack/ratpack/security/advisories/GHSA-mvqp-q37c-wf9j

For more information

If you have any questions or comments about this advisory:

• Open an issue in GitHub