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Vulnerability · Published Mar 17, 2023 · Assigned by GitHub_M

CVE-2023-27593cilium-agent container can access the host via `hostPath` mount

Medium 4.4

In plain English

A medium-severity incorrect default permissions in cilium from cilium. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 12% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)4.4Medium
Exploit odds (30 days)0.2%top 87.8% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known

Official description

Cilium is a networking, observability, and security solution with an eBPF-based dataplane. Prior to versions 1.11.15, 1.12.8, and 1.13.1, 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. The issue has been fixed and the fix is available on versions 1.11.15, 1.12.8, and 1.13.1. Some workarounds are available. Kubernetes RBAC should be used 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.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
Gogithub.com/cilium/cilium1.11.15GHSA-4hc4-pgfx-3mrx
Gogithub.com/cilium/cilium1.12.8GHSA-4hc4-pgfx-3mrx
Gogithub.com/cilium/cilium1.13.1GHSA-4hc4-pgfx-3mrx

Affected products (as reported)

VendorProductVersions
cilium cilium < 1.11.15>= 1.12.0, < 1.12.8>= 1.13.0, < 1.13.1

Weakness: CWE-276 · Vector: CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H

References