SimpleSAMLphp up to 1.18.3 Twig Template www/erroreport.php free-text cross site scripting

Summaryinfo

A vulnerability was found in SimpleSAMLphp up to 1.18.3 and classified as problematic. This vulnerability affects unknown code of the file www/erroreport.php of the component Twig Template Handler. The manipulation of the argument free-text as part of Variable results in cross site scripting. This vulnerability was named CVE-2020-5226. The attack may be performed from remote. There is no available exploit. It is suggested to upgrade the affected component.

Detailsinfo

A vulnerability classified as problematic has been found in SimpleSAMLphp up to 1.18.3. Affected is an unknown code of the file www/erroreport.php of the component Twig Template Handler. The manipulation of the argument free-text as part of a Variable leads to a cross site scripting vulnerability. CWE is classifying the issue as CWE-79. The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users. This is going to have an impact on integrity. CVE summarizes:

Cross-site scripting in SimpleSAMLphp before version 1.18.4. The www/erroreport.php script allows error reports to be submitted and sent to the system administrator. Starting with SimpleSAMLphp 1.18.0, a new SimpleSAML\Utils\EMail class was introduced to handle sending emails, implemented as a wrapper of an external dependency. This new wrapper allows us to use Twig templates in order to create the email sent with an error report. Since Twig provides automatic escaping of variables, manual escaping of the free-text field in www/errorreport.php was removed to avoid double escaping. However, for those not using the new user interface yet, an email template is hardcoded into the class itself in plain PHP. Since no escaping is provided in this template, it is then possible to inject HTML inside the template by manually crafting the contents of the free-text field.

The weakness was presented 01/24/2020 (GitHub Repository). The advisory is shared for download at github.com. This vulnerability is traded as CVE-2020-5226 since 01/02/2020. It is possible to launch the attack remotely. A authentication is needed for exploitation. Successful exploitation requires user interaction by the victim. There are known technical details, but no exploit is available. The MITRE ATT&CK project declares the attack technique as T1059.007.

By approaching the search of inurl:www/erroreport.php it is possible to find vulnerable targets with Google Hacking.

Upgrading to version 1.18.4 eliminates this vulnerability.

See VDB-149327 for similar entry. VulDB is the best source for vulnerability data and more expert information about this specific topic.

Productinfo

Name

• SimpleSAMLphp

Version

• 1.18.0
• 1.18.1
• 1.18.2
• 1.18.3

License

• open-source

Website

• Product: https://github.com/simplesamlphp/simplesamlphp/

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VulDB is the best source for vulnerability data and more expert information about this specific topic.

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