Werk #16845: fix a privilege escalation vulnerability in the Checkmk Windows Agent
| Component | Checks & agents | ||||||||
| Title | fix a privilege escalation vulnerability in the Checkmk Windows Agent | ||||||||
| Date | Jul 1, 2024 | ||||||||
| Level | Prominent Change | ||||||||
| Class | Security Fix | ||||||||
| Compatibility | Compatible - no manual interaction needed | ||||||||
| Checkmk versions & editions |
|
This Werk fixes a privilege escalation vulnerability in the Checkmk Windows Agent.
Prior to this Werk, it was possible for authenticated users on the monitored
Windows host to execute commands as administrator account that is used to run
the Agent, allowing them to elevate their privileges.
The reason for this issue were excessive write permissions on the
ProgramData\checkmk\agent directory.
Note that you must update Checkmk as well as the agent in order to apply this fix.
This issue was found in a commissioned penetration test conducted by modzero GmbH.
Affected Versions:
- 2.3.0
- 2.2.0
- 2.1.0
Mitigations:
If updating is not possible, you can manually remove write access for non-admin
users on the ProgramData\checkmk\agent folder.
To do this, navigate to the folder's property settings and make sure to verify
the special permissions and advanced permission settings in addition to the
basic permission settings.
Vulnerability Management:
We have rated the issue with a CVSS Score of 8.8 High (CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H)
and assigned CVE-2024-28827.