[SECURITY] CVE-2017-15706 Apache Tomcat Incorrectly documented CGI search algorithm

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

CVE-2017-15706 Apache Tomcat Incorrectly documented CGI search algorithm

Severity: Low

Vendor: The Apache Software Foundation

Versions Affected:
Apache Tomcat 9.0.0.M22 to 9.0.1
Apache Tomcat 8.5.16 to 8.5.23
Apache Tomcat 8.0.45 to 8.0.47
Apache Tomcat 7.0.79 to 7.0.82

Description:
As part of the fix for bug 61201, the description of the search
algorithm used by the CGI Servlet to identify which script to execute
was updated. The update was not correct. As a result, some scripts may
have failed to execute as expected and other scripts may have been
executed unexpectedly.
Note that the behaviour of the CGI servlet has remained unchanged in
this regard. It is only the documentation of the behaviour that was
wrong and has been corrected.

Mitigation:
Users of the affected versions should review the CGI documentation
from one of the following versions and ensure that the described CGI
search algorithm matches their expectation:
- Apache Tomcat 9.0.2 or later
- Apache Tomcat 8.5.24 or later
- Apache Tomcat 8.0.48 or later
- Apache Tomcat 7.0.84 or later
  (Apache Tomcat 7.0.83 has the fix but was not released)

Credit:
This issue was reported responsibly to the Apache Tomcat Security Team
by Michael Grenier.

History:
2018-01-31 Original advisory

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