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

Quick assessment

Affected
cilium cilium
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Cilium是一个开源软件。用于提供和透明地保护应用程序工作负载（如应用程序容器或进程）之间的网络连接和负载平衡。 Cilium 1.11.14版本及之前版本、1.12.7版本及之前版本、1.13.0版本存在安全漏洞。攻击者利用该漏洞可以获得对底层节点的访问权限。

CVSS 4.4 · Medium EPSS 0.22% · P12
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I. Basic Information for CVE-2023-27593

Vulnerability Information
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Vulnerability Title
cilium-agent container can access the host via `hostPath` mount
Source: CVE Program / CVE List V5
Vulnerability 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: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
缺省权限不正确
Source: CVE Program / CVE List V5
Vulnerability Title
Cilium 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Cilium是一个开源软件。用于提供和透明地保护应用程序工作负载（如应用程序容器或进程）之间的网络连接和负载平衡。 Cilium 1.11.14版本及之前版本、1.12.7版本及之前版本、1.13.0版本存在安全漏洞。攻击者利用该漏洞可以获得对底层节点的访问权限。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
cilium cilium < 1.11.15 -

II. Public POCs for CVE-2023-27593

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III. Intelligence Information for CVE-2023-27593

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Patches & Fixes for CVE-2023-27593 (1)

Vendor Advisories for CVE-2023-27593 (1)

Other References for CVE-2023-27593 (4)

Same Patch Batch · cilium · 2023-03-17 · 3 CVEs total

CVE-2023-27595 6.5 MEDIUM Cilium eBPF filters may be temporarily removed during agent restart
CVE-2023-27594 4.2 MEDIUM Cilium vulnerable to potential network policy bypass when routing IPv6 traffic

IV. Related Vulnerabilities

Same product: cilium
Same vendor: cilium
Same weakness: CWE-276

V. Comments for CVE-2023-27593

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