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CVE-2023-34242— Cilium vulnerable to information leakage via incorrect ReferenceGrant handling

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 1.13.4 之前版本存在信息泄露漏洞，该漏洞源于当在 Cilium 中启用 Gateway API 时，如果不检查创建 ReferenceGrant 的命名空间，可能会导致 Cilium 无意中获得跨命名空间的部分信息（包括证书）和服务的可见性。

CVSS 3.4 · Low EPSS 0.30% · P21
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I. Basic Information for CVE-2023-34242

Vulnerability Information
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Vulnerability Title
Cilium vulnerable to information leakage via incorrect ReferenceGrant handling
Source: CVE Program / CVE List V5
Vulnerability Description
Cilium is a networking, observability, and security solution with an eBPF-based dataplane. Prior to version 1.13.4, when Gateway API is enabled in Cilium, the absence of a check on the namespace in which a ReferenceGrant is created could result in Cilium unintentionally gaining visibility of secrets (including certificates) and services across namespaces. An attacker on an affected cluster can leverage this issue to use cluster secrets that should not be visible to them, or communicate with services that they should not have access to. Gateway API functionality is disabled by default. This vulnerability is fixed in Cilium release 1.13.4. As a workaround, restrict the creation of `ReferenceGrant` resources to admin users by using Kubernetes RBAC.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:A/AC:L/PR:H/UI:N/S:C/C:L/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
信息暴露
Source: CVE Program / CVE List V5
Vulnerability Title
Cilium 信息泄露漏洞
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 1.13.4 之前版本存在信息泄露漏洞，该漏洞源于当在 Cilium 中启用 Gateway API 时，如果不检查创建 ReferenceGrant 的命名空间，可能会导致 Cilium 无意中获得跨命名空间的部分信息（包括证书）和服务的可见性。
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 < 1.13.4 -

II. Public POCs for CVE-2023-34242

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III. Intelligence Information for CVE-2023-34242

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Vendor Advisories for CVE-2023-34242 (1)

Other References for CVE-2023-34242 (1)

IV. Related Vulnerabilities

Same product: cilium
Same vendor: cilium
Same weakness: CWE-200

V. Comments for CVE-2023-34242

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