CVE-2020-5301: Information disclosure of source code in SimpleSAMLphp
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.
Other sources
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.
Affected Software
Remediation
Event History
Frequently Asked Questions
What is the vulnerability ID for this information disclosure vulnerability?
The vulnerability ID for this information disclosure vulnerability is CVE-2020-5301.
What is the severity level of CVE-2020-5301?
CVE-2020-5301 has a severity level of low, with a severity value of 3.1.
What does CVE-2020-5301 affect?
CVE-2020-5301 affects SimpleSAMLphp versions before 1.18.6.
How can I fix CVE-2020-5301?
To fix CVE-2020-5301, you should update SimpleSAMLphp to version 1.18.6 or later.
Where can I find more information about CVE-2020-5301?
You can find more information about CVE-2020-5301 on the SimpleSAMLphp website and on the GitHub page for the project.