CVE-2020-5301

SimpleSAMLphp versions before 1.18.6 contain an information disclosure
vulnerability. The module controller in SimpleSAML\Module that processes
requests for pages hosted by modules, has code to identify paths ending
with .php and process those as PHP code. If no other suitable way of
handling the given path exists it presents the file to the browser. The
check to identify paths ending with .php does not account for uppercase
letters. If someone requests a path ending with e.g. .PHP and the server
is serving the code from a case-insensitive file system, such as on
Windows, the processing of the PHP code does not occur, and the source code
is instead presented to the browser. An attacker may use this issue to gain
access to the source code in third-party modules that is meant to be
private, or even sensitive. However, the attack surface is considered
small, as the attack will only work when SimpleSAMLphp serves such content
from a file system that is not case-sensitive, such as on Windows. This
issue is fixed in version 1.18.6.