LibreNMS uses Improper Sanitization on Service template name leads to Stored XSS

Summary

There is improper sanitization on Service template name which is reflecting in delete button onclick event. This value can be modified and crafted as any other javascript code.

Vulnerable Code

https://github.com/librenms/librenms/blob/a61c11db7e8ef6a437ab55741658be2be7d14d34/app/Http/Controllers/ServiceTemplateController.php#L67C23-L67C23

Above is vulnerable code line which needs to be properly sanitized

PoC

1. Go to /services/templates
2. Enter name as testing', '14', 'http://172.105.62.194:8000/services/templates/14');alert(1);//
3. Submit it and try to delete it, you will see popup

If you inspect element on delete button, you will notice this:-
<img width=“748” alt=“Screenshot 2023-11-23 at 9 30 24 PM” src=“https://user-images.githubusercontent.com/31764504/285260018-7672a93d-e29b-4444-8057-e6ffcb8dabfc.png”>

Impact

Cross site scripting can lead to cookie stealing or an attacker can execute any other feature using this feature.