Headline
GHSA-fpq5-4vwm-78x4: LibreNMS has Broken Access control on Graphs Feature
Summary
This vulnerability occurs when application is not checking access of each type of users as per their role and it autorizing the users to access any feature. When user access his Device dashboard in librenms, one request is going to graph.php to access image of graphs generated on the particular Device. This request can be accessed by lower privileged users as well and they can enumerate devices on librenms with their id or hostname.
Details
Give all details on the vulnerability. Pointing to the incriminated source code is very helpful for the maintainer.
PoC
Login with Lower privilege user
Go to /graph.php?width=150&height=45&device=1&type=device_ping_perf&from=1699022192&legend=no&bg=FFFFFF00&popup_title=ICMP+Response
If its showing image with “device*ping_perf” which confirms that there is device with id 1
Now you can change device parameter in above URL with hostname to check if that Hostname/IP exist or not like http://127.0.0.1:8000/graph.php?width=150&height=45&device=127.0.0.1&type=device_ping_perf&from=1699022192&legend=no&bg=FFFFFF00&popup_title=ICMP+Response
If device hostname doesn’t exist then it should show 500 error
Check attached screenshots for more info
Vulnerable code: https://github.com/librenms/librenms/blob/fa93034edd40c130c2ff00667ca2498d84be6e69/html/graph.php#L19C1-L25C2
Above is vulnerable line of code from Line number 19-25 This is not checking privilege of users to access any device hostname, its just checking if user is authenticated or not
Impact
Low privilege users can see all devices registered by admin users by using this method
Solution
Implement privilege access control feature to check if low privilege user have access or not.
Screenshots:-
<img width="967" alt="Screenshot 2023-11-04 at 8 31 15 PM" src="https://user-images.githubusercontent.com/31764504/281085588-1c5d81b9-83d7-4ba8-baf3-03c95a99cefe.png"> <img width="973" alt="Screenshot 2023-11-04 at 8 31 36 PM" src="https://user-images.githubusercontent.com/31764504/281085614-7a4d13b0-d316-4d24-bdd2-05c3a80ffd59.png"> <img width="955" alt="Screenshot 2023-11-04 at 8 31 48 PM" src="https://user-images.githubusercontent.com/31764504/281085629-43aa2b6f-7b18-415f-8001-519bda45f918.png">
Summary
This vulnerability occurs when application is not checking access of each type of users as per their role and it autorizing the users to access any feature. When user access his Device dashboard in librenms, one request is going to graph.php to access image of graphs generated on the particular Device. This request can be accessed by lower privileged users as well and they can enumerate devices on librenms with their id or hostname.
Details
Give all details on the vulnerability. Pointing to the incriminated source code is very helpful for the maintainer.
PoC
Login with Lower privilege user
Go to /graph.php?width=150&height=45&device=1&type=device_ping_perf&from=1699022192&legend=no&bg=FFFFFF00&popup_title=ICMP+Response
If its showing image with “device*ping_perf” which confirms that there is device with id 1
Now you can change device parameter in above URL with hostname to check if that Hostname/IP exist or not like
http://127.0.0.1:8000/graph.php?width=150&height=45&device=127.0.0.1&type=device_ping_perf&from=1699022192&legend=no&bg=FFFFFF00&popup_title=ICMP+ResponseIf device hostname doesn’t exist then it should show 500 error
Check attached screenshots for more info
Vulnerable code:
https://github.com/librenms/librenms/blob/fa93034edd40c130c2ff00667ca2498d84be6e69/html/graph.php#L19C1-L25C2
Above is vulnerable line of code from Line number 19-25
This is not checking privilege of users to access any device hostname, its just checking if user is authenticated
or not
Impact
Low privilege users can see all devices registered by admin users by using this method
Solution
Implement privilege access control feature to check if low privilege user have access or not.
Screenshots:-
References
- GHSA-fpq5-4vwm-78x4
- librenms/librenms@489978a
- https://github.com/librenms/librenms/blob/fa93034edd40c130c2ff00667ca2498d84be6e69/html/graph.php#L19C1-L25C2
Related news
LibreNMS is an auto-discovering PHP/MySQL/SNMP based network monitoring which includes support for a wide range of network hardware and operating systems. In affected versions of LibreNMS when a user accesses their device dashboard, one request is sent to `graph.php` to access graphs generated on the particular Device. This request can be accessed by a low privilege user and they can enumerate devices on librenms with their id or hostname. Leveraging this vulnerability a low privilege user can see all devices registered by admin users. This vulnerability has been addressed in commit `489978a923` which has been included in release version 23.11.0. Users are advised to upgrade. There are no known workarounds for this vulnerability.