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CVE-2023-27594— Cilium vulnerable to potential network policy bypass when routing IPv6 traffic

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版本存在授权问题漏洞，该漏洞源于Cilium会将流量的源IP地址错误地分配给集群。

CVSS 4.2 · Medium EPSS 0.55% · P44

Possible ATT&CK Techniques 1 AI

T1565.001 · Stored Data Manipulation
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I. Basic Information for CVE-2023-27594

Vulnerability Information
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Vulnerability Title
Cilium vulnerable to potential network policy bypass when routing IPv6 traffic
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, under specific conditions, Cilium may misattribute the source IP address of traffic to a cluster, identifying external traffic as coming from the host on which Cilium is running. As a consequence, network policies for that cluster might be bypassed, depending on the specific network policies enabled. This issue only manifests when Cilium is routing IPv6 traffic and NodePorts are used to route traffic to pods. IPv6 and endpoint routes are both disabled by default. The problem has been fixed and is available on versions 1.11.15, 1.12.8, and 1.13.1. As a workaround, disable IPv6 routing.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
授权机制不恰当
Source: CVE Program / CVE List V5
Vulnerability Title
Cilium 授权问题漏洞
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版本存在授权问题漏洞，该漏洞源于Cilium会将流量的源IP地址错误地分配给集群。
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-2023-27594

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III. Intelligence Information for CVE-2023-27594

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Vendor Advisories for CVE-2023-27594 (1)

Other References for CVE-2023-27594 (3)

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-2023-27593 4.4 MEDIUM cilium-agent container can access the host via `hostPath` mount

IV. Related Vulnerabilities

Same product: cilium
Same vendor: cilium
Same weakness: CWE-285

V. Comments for CVE-2023-27594

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