PT-2023-21233 · Cilium+1 · Cilium+1
Daniel-F3
+2
·
Published
2023-03-17
·
Updated
2024-07-01
·
CVE-2023-27593
CVSS v3.1
4.4
Medium
| Vector | AV:L/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H |
Name of the Vulnerable Software and Affected Versions
Cilium versions prior to 1.11.15
Cilium versions prior to 1.12.8
Cilium versions prior to 1.13.1
Description
Cilium is a networking, observability, and security solution with an eBPF-based dataplane. An attacker with access to a Cilium agent pod can write to
/opt/cni/bin due to a hostPath mount of that directory in the agent pod. By replacing the CNI binary with their own malicious binary and waiting for the creation of a new pod on the node, the attacker can gain access to the underlying node. Kubernetes RBAC should be used to deny users and service accounts exec access to Cilium agent pods.Recommendations
For versions prior to 1.11.15, update to version 1.11.15 or later.
For versions prior to 1.12.8, update to version 1.12.8 or later.
For versions prior to 1.13.1, update to version 1.13.1 or later.
As a temporary workaround, consider using Kubernetes RBAC to deny users and service accounts
exec access to Cilium agent pods.
In cases where a user requires exec access to Cilium agent pods, but should not have access to the underlying node, no workaround is possible.Exploit
Fix
Incorrect Default Permissions
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Weakness Enumeration
Related Identifiers
Affected Products
Cilium
Kubernetes