CVE-2020-5226 Information

Description

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.

CVSS Vector

CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N

Reference

https://github.com/simplesamlphp/simplesamlphp/security/advisories/GHSA-mj9p-v2r8-wf8w https://simplesamlphp.org/security/202001-01

Attack Complexity

LOW

Privileges Required

LOW

User Interaction Required

LOW

Scope

REQUIRED

Confidentiality Impact

CHANGED

Integrity Impact

LOW

Availability Impact

LOW

Base Score

NONE

Base Severity

5.4