Kruise provides automated management of large-scale applications on Kubernetes. Prior to versions 1.8.3 and 1.7.5, PodProbeMarker allows defining custom probes with TCPSocket or HTTPGet handlers. The webhook validation does not restrict the Host field in these probe configurations.
Since kruise-daemon runs with hostNetwork=true, it executes probes from the node network namespace. An attacker with PodProbeMarker creation permission can specify arbitrary Host values to trigger SSRF from the node, perform port scanning, and receive response feedback through NodePodProbe status messages. Versions 1.8.3 and 1.7.5 patch the issue.
Attack Parameters
Attack Vector
Network
Can be exploited remotely
Attack Complexity
Low
Easy to exploit
Privileges Required
Low
Basic privileges needed
User Interaction
None
No user interaction needed
Impact Assessment
Confidentiality
None
No data leak
Integrity
None
No data modification
Availability
None
No disruption
CVSS Vector v3.1
Weakness Type (CWE)
References 4
https://github.com/openkruise/kruise/commit/94364b76adf3e8a1749a31afe809a163bed…
security-advisories@github.com
https://github.com/openkruise/kruise/releases/tag/v1.7.5
security-advisories@github.com
https://github.com/openkruise/kruise/releases/tag/v1.8.3
security-advisories@github.com
https://github.com/openkruise/kruise/security/advisories/GHSA-9fj4-3849-rv9g
security-advisories@github.com