[SECURITY] CVE-2020-1935 HTTP Request Smuggling

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

CVE-2020-1935 HTTP Request Smuggling

Severity: Low

Vendor: The Apache Software Foundation

Versions Affected:
Apache Tomcat 9.0.0.M1 to 9.0.30
Apache Tomcat 8.5.0 to 8.5.50
Apache Tomcat 7.0.0 to 7.0.99

Description:
The HTTP header parsing code used an approach to end-of-line parsing
that allowed some invalid HTTP headers to be parsed as valid. This led
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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