[SECURITY] CVE-2021-33037 Apache Tomcat HTTP request smuggling

[Mark Thomas <ma...@apache.org>]

CVE-2021-33037 HTTP request smuggling

Severity: Important

Vendor: The Apache Software Foundation

Versions Affected:
Apache Tomcat 10.0.0-M1 to 10.0.6
Apache Tomcat 9.0.0.M1 to 9.0.46
Apache Tomcat 8.5.0 to 8.5.66

Description:
Apache Tomcat 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.</p>

Mitigation:
Users of the affected versions should apply one of the following
mitigations:
- Upgrade to Apache Tomcat 10.0.7 or later
- Upgrade to Apache Tomcat 9.0.48 or later
- Upgrade to Apache Tomcat 8.5.68 or later
Note that issue was fixed in 9.0.47 and 8.5.67 but the release votes for 
those versions did not pass.

History:
2021-07-12 Original advisory

References:
[1] https://tomcat.apache.org/security-10.html
[2] https://tomcat.apache.org/security-9.html
[3] https://tomcat.apache.org/security-8.html






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