CVE-2023-27593 (GCVE-0-2023-27593)

Vulnerability from cvelistv5 – Published: 2023-03-17 19:51 – Updated: 2025-02-25 14:53
VLAI?
Summary
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.
Severity ?
4.4 (Medium)
CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H
CWE
  • CWE-276 - Incorrect Default Permissions
Assigner
References
Impacted products
Vendor Product Version
cilium cilium Affected: < 1.11.15
Affected: >= 1.12.0, < 1.12.8
Affected: >= 1.13.0, < 1.13.1
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    "vulnrichment": {
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      "cveMetadata": "{\"cveId\": \"CVE-2023-27593\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2025-02-25T14:53:40.623Z\", \"dateReserved\": \"2023-03-04T01:03:53.635Z\", \"assignerOrgId\": \"a0819718-46f1-4df5-94e2-005712e83aaa\", \"datePublished\": \"2023-03-17T19:51:16.689Z\", \"assignerShortName\": \"GitHub_M\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.1"
    }
  }
}


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Sightings

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Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.



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