CVE-2022-42252: Inconsistent Interpretation of HTTP Requests ('HTTP Request Smuggling')

November 1, 2022 (updated May 30, 2023)

If Apache Tomcat 8.5.0 to 8.5.52, 9.0.0-M1 to 9.0.67, 10.0.0-M1 to 10.0.26 or 10.1.0-M1 to 10.1.0 was configured to ignore invalid HTTP headers via setting rejectIllegalHeader to false (the default for 8.5.x only), Tomcat does not reject a request containing an invalid Content-Length header making a request smuggling attack possible if Tomcat was located behind a reverse proxy that also failed to reject the request with the invalid header.

References

lists.apache.org/thread/zzcxzvqfdqn515zfs3dxb7n8gty589sq
nvd.nist.gov/vuln/detail/CVE-2022-42252

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