Cilium up to 1.12.13/1.13.6/1.14.1 Network Policy Object missing authentication

Summaryinfo

A vulnerability was found in Cilium up to 1.12.13/1.13.6/1.14.1. It has been rated as critical. Affected by this issue is some unknown functionality of the component Network Policy Object Handler. This manipulation causes missing authentication. This vulnerability appears as CVE-2023-41333. The attacker needs to be present on the local network. There is no available exploit. Upgrading the affected component is advised.

Detailsinfo

A vulnerability classified as critical was found in Cilium up to 1.12.13/1.13.6/1.14.1. Affected by this vulnerability is an unknown function of the component Network Policy Object Handler. The manipulation with an unknown input leads to a missing authentication vulnerability. The CWE definition for the vulnerability is CWE-306. The product does not perform any authentication for functionality that requires a provable user identity or consumes a significant amount of resources. As an impact it is known to affect confidentiality, integrity, and availability. The summary by CVE is:

Cilium is a networking, observability, and security solution with an eBPF-based dataplane. An attacker with the ability to create or modify CiliumNetworkPolicy objects in a particular namespace is able to affect traffic on an entire Cilium cluster, potentially bypassing policy enforcement in other namespaces. By using a crafted `endpointSelector` that uses the `DoesNotExist` operator on the `reserved:init` label, the attacker can create policies that bypass namespace restrictions and affect the entire Cilium cluster. This includes potentially allowing or denying all traffic. This attack requires API server access, as described in the Kubernetes API Server Attacker section of the Cilium Threat Model. This issue has been resolved in Cilium versions 1.14.2, 1.13.7, and 1.12.14. As a workaround an admission webhook can be used to prevent the use of `endpointSelectors` that use the `DoesNotExist` operator on the `reserved:init` label in CiliumNetworkPolicies.

The weakness was presented 09/27/2023 as GHSA-4xp2-w642-7mcx. The advisory is shared at github.com. This vulnerability is known as CVE-2023-41333 since 08/28/2023. Neither technical details nor an exploit are publicly available.

Upgrading to version 1.12.14, 1.13.7 or 1.14.2 eliminates this vulnerability. Applying a patch is able to eliminate this problem. The bugfix is ready for download at github.com. The best possible mitigation is suggested to be upgrading to the latest version.

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Productinfo

Name

• Cilium

Version

• 1.12.0
• 1.12.1
• 1.12.2
• 1.12.3
• 1.12.4
• 1.12.5
• 1.12.6
• 1.12.7
• 1.12.8
• 1.12.9
• 1.12.10
• 1.12.11
• 1.12.12
• 1.12.13
• 1.13.0
• 1.13.1
• 1.13.2
• 1.13.3
• 1.13.4
• 1.13.5
• 1.13.6
• 1.14.0
• 1.14.1

Website

• Product: https://github.com/cilium/cilium/

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