Information disclosure of source code in SimpleSAMLphp

2020-04-22T20:59:44
ID GHSA-24M3-W8G9-JWPQ
Type github
Reporter GitHub Advisory Database
Modified 2020-04-30T20:35:20

Description

Background

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.

Description

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.

Affected versions

SimpleSAMLphp versions 1.18.5 and older.

Impact

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.

Resolution

Upgrade the SimpleSAMLphp installation to version 1.18.6.

Credit

This vulnerability was discovered and reported by Sławek Naczyński.