CVE-2023-27593

Published Mar 17, 2023

Last updated a year ago

Overview

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.
Source: security-advisories@github.com
NVD status: Modified

Hype score: Not currently trending

Risk scores

CVSS 3.1

Type: Primary
Base score: 5.5
Impact score: 3.6
Exploitability score: 1.8
Vector string: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Severity: MEDIUM

Weaknesses

security-advisories@github.com: CWE-276

Configurations

[
  {
    "nodes": [
      {
        "negate": false,
        "cpeMatch": [
          {
            "criteria": "cpe:2.3:a:cilium:cilium:*:*:*:*:*:*:*:*",
            "vulnerable": true,
            "matchCriteriaId": "7726ABC1-0140-46EA-ACDD-44B09826648E",
            "versionEndExcluding": "1.11.15"
          },
          {
            "criteria": "cpe:2.3:a:cilium:cilium:*:*:*:*:*:*:*:*",
            "vulnerable": true,
            "matchCriteriaId": "30E4F1B2-07F4-47AC-8535-553DFF9877C7",
            "versionEndExcluding": "1.12.8",
            "versionStartIncluding": "1.12.0"
          },
          {
            "criteria": "cpe:2.3:a:cilium:cilium:*:*:*:*:*:*:*:*",
            "vulnerable": true,
            "matchCriteriaId": "C27C25C7-4E92-48FA-AD06-F4409E57431A",
            "versionEndExcluding": "1.13.1",
            "versionStartIncluding": "1.13.0"
          }
        ],
        "operator": "OR"
      }
    ]
  }
]

Overview

Social media

Risk scores

CVSS 3.1

Weaknesses

Configurations

References