#perl

### Summary XSS attacks occurs when application is not sanitising inputs properly and rendering the code from user input to browser which could allow an attacker to execute malicious javascript code. ### PoC 1. Login 2. Create a device group in /device-groups 3. Name it as `"><img src=x onerror=alert(1);>` 4. save it 5. Go to services and create a service template and add that device group into that and save it 6. After that go back to device groups and delete that device, you will see XSS payload popup in message <img width="1043" alt="Screenshot 2023-11-08 at 9 15 56 PM" src="https://user-images.githubusercontent.com/31764504/281489434-9beaebd6-b9ce-4098-a8e0-d67b185062b5.png"> ### Vulnerable code: https://github.com/librenms/librenms/blob/63eeeb71722237d1461a37bb6da99fda25e02c91/app/Http/Controllers/DeviceGroupController.php#L173C21-L173C21 Line 173 is not sanitizing device name properly <img width="793" alt="Screenshot 2023-11-08 at 9 26 14 PM" src="https://user-images.githubus...

LibreNMS is an auto-discovering PHP/MySQL/SNMP based network monitoring which includes support for a wide range of network hardware and operating systems. Affected versions are subject to a cross site scripting (XSS) vulnerability in the device group popups. This issue has been addressed in commit `faf66035ea` which has been included in release version 23.11.0. Users are advised to upgrade. There are no known workarounds for this vulnerability.

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Avoiding some of these common mistakes ensures your organization’s plan will be updated faster and is more thorough, so you are ready to act when, not if, an incident happens.