It’s a (SNMP) Trap: Gaining Code Execution on LibreNMS
Blog post from Sonar
This vulnerability in LibreNMS, a monitoring solution developed in PHP, can be exploited by an unauthenticated attacker to gain remote code execution by sending a single SNMP trap. The vulnerability is due to a lack of proper output encoding and the use of user-controllable values in the event type parameter, which can lead to cross-site scripting (XSS) attacks. The impact of this vulnerability is greatly increased due to the Alert Template feature, which uses the Blade template engine without proper sandboxing. The patch has been released in version 22.11.0, and it's recommended to update any instance with a version prior to this release. A defense-in-the-depth approach is crucial to prevent such vulnerabilities, and safe alternatives to run untrusted data in a template engine should be used.
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