CVE-2023-45648: Improper Input Validation

October 10, 2023 (updated November 4, 2023)

Improper Input Validation vulnerability in Apache Tomcat.Tomcat from 11.0.0-M1 through 11.0.0-M11, from 10.1.0-M1 through 10.1.13, from 9.0.0-M1 through 9.0.81 and from 8.5.0 through 8.5.93 does not correctly parse HTTP trailer headers. A specially crafted, invalid trailer header could cause Tomcat to treat a single request as multiple requests leading to the possibility of request smuggling when behind a reverse proxy.

Users are recommended to upgrade to version 11.0.0-M12 onwards, 10.1.14 onwards, 9.0.81 onwards or 8.5.94 onwards, which fix the issue.

References

www.openwall.com/lists/oss-security/2023/10/10/10
github.com/advisories/GHSA-r6j3-px5g-cq3x
lists.apache.org/thread/2pv8yz1pyp088tsxfb7ogltk9msk0jdp
nvd.nist.gov/vuln/detail/CVE-2023-45648

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