CVE-2023-34981: Exposure of Sensitive Information to an Unauthorized Actor

June 21, 2023 (updated July 21, 2023)

A regression in the fix for bug 66512 in Apache Tomcat 11.0.0-M5, 10.1.8, 9.0.74 and 8.5.88 meant that, if a response does not include any HTTP headers no AJP SEND_HEADERS messare would be sent for the response which in turn meant that at least one AJP proxy (mod_proxy_ajp) would use the response headers from the previous request leading to an information leak.

References

github.com/apache/tomcat/commit/739c7381aed22b7636351caf885ddc519ab6b442
lists.apache.org/thread/j1ksjh9m9gx1q60rtk1sbzmxhvj5h5qz
nvd.nist.gov/vuln/detail/CVE-2023-34981

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