[SECURITY] CVE-2019-17569 HTTP Request Smuggling

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

CVE-2019-17569 HTTP Request Smuggling

Severity: Low

Vendor: The Apache Software Foundation

Versions Affected:
Apache Tomcat 9.0.28 to 9.0.30
Apache Tomcat 8.5.48 to 8.5.50
Apache Tomcat 7.0.98 to 7.0.99

Description:
The refactoring in 9.0.28, 8.5.48 and 7.0.98 introduced a regression.
The result of the regression was that invalid Transfer-Encoding headers
were incorrectly processed leading to a possibility of HTTP Request
Smuggling if Tomcat was located behind a reverse proxy that incorrectly
handled the invalid Transfer-Encoding header in a particular manner.
Such a reverse proxy is considered unlikely.

Mitigation:
- Upgrade to Apache Tomcat 9.0.31 or later
- Upgrade to Apache Tomcat 8.5.51 or later
- Upgrade to Apache Tomcat 7.0.100 or later

Credit:
This issue was found by @ZeddYu and reported responsibly to the Apache
Tomcat Security Team.

References:
[1] http://tomcat.apache.org/security-9.html
[2] http://tomcat.apache.org/security-8.html
[3] http://tomcat.apache.org/security-7.html

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