Impact
A vulnerability has been identified whereby RKE2 deployments in Windows nodes have weak Access Control Lists (ACL), allowing BUILTIN\Users or NT AUTHORITY\Authenticated Users to view or edit sensitive files which could lead to privilege escalation.
The affected files include binaries, scripts, configuration and log files:
C:\etc\rancher\node\password
C:\var\lib\rancher\rke2\agent\logs\kubelet.log
C:\var\lib\rancher\rke2\data\v1.**.**-rke2r*-windows-amd64-*\bin\*
C:\var\lib\rancher\rke2\bin\*
This vulnerability is exclusive to RKE2 in Windows environments. Linux environments are not affected by it.
Please consult the associated MITRE ATT&CK - Technique - Exploitation for Privilege Escalation for further information about this category of attack.
Patches
Patched versions include RKE2 1.31.0, 1.30.2, 1.29.6, 1.28.11 and 1.27.15.
Workarounds
Users are advised to do a fresh install of their RKE2 Windows nodes using a patched RKE2 version.
When that is not possible, users can enforce stricter ACLs for all sensitive files affected by this Security Advisory running this PowerShell script as an Administrator on each node.
References
For more information
If you have any questions or comments about this advisory:
Impact
A vulnerability has been identified whereby RKE2 deployments in Windows nodes have weak Access Control Lists (ACL), allowing
BUILTIN\UsersorNT AUTHORITY\Authenticated Usersto view or edit sensitive files which could lead to privilege escalation.The affected files include binaries, scripts, configuration and log files:
This vulnerability is exclusive to RKE2 in Windows environments. Linux environments are not affected by it.
Please consult the associated MITRE ATT&CK - Technique - Exploitation for Privilege Escalation for further information about this category of attack.
Patches
Patched versions include RKE2
1.31.0,1.30.2,1.29.6,1.28.11and1.27.15.Workarounds
Users are advised to do a fresh install of their RKE2 Windows nodes using a patched RKE2 version.
When that is not possible, users can enforce stricter ACLs for all sensitive files affected by this Security Advisory running this PowerShell script as an Administrator on each node.
References
For more information
If you have any questions or comments about this advisory: