UBUNTU-CVE-2021-33037

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UBUNTU-CVE-2021-33037

Summary:

Details: Apache Tomcat 10.0.0-M1 to 10.0.6, 9.0.0.M1 to 9.0.46 and 8.5.0 to 8.5.66 did not correctly parse the HTTP transfer-encoding request header in some circumstances leading to the possibility to request smuggling when used with a reverse proxy. Specifically: - Tomcat incorrectly ignored the transfer encoding header if the client declared it would only accept an HTTP/1.0 response; - Tomcat honoured the identify encoding; and - Tomcat did not ensure that, if present, the chunked encoding was the final encoding.

References: https://ubuntu.com/security/CVE-2021-33037, https://github.com/apache/tomcat/commit/45d70a86a901cbd534f8f570bed2aec9f7f7b88e, https://github.com/apache/tomcat/commit/05f9e8b00f5d9251fcd3c95dcfd6cf84177f46c8, https://github.com/apache/tomcat/commit/a2c3dc4c96168743ac0bab613709a5bbdaec41d0, https://github.com/apache/tomcat/commit/3202703e6d635e39b74262e81f0cb4bcbe2170dc, https://github.com/apache/tomcat/commit/da0e7cb093cf68b052d9175e469dbd0464441b0b, https://github.com/apache/tomcat/commit/8874fa02e9b36baa9ca6b226c0882c0190ca5a02, https://lists.apache.org/thread.html/r612a79269b0d5e5780c62dfd34286a8037232fec0bc6f1a7e60c9381%40%3Cannounce.tomcat.apache.org%3E, https://ubuntu.com/security/notices/USN-5360-1, https://www.cve.org/CVERecord?id=CVE-2021-33037