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.
Published 2023-09-27 15:19:30
Updated 2023-09-30 02:01:51
Source GitHub, Inc.
View at NVD,   CVE.org

Products affected by CVE-2023-41333

Exploit prediction scoring system (EPSS) score for CVE-2023-41333

0.04%
Probability of exploitation activity in the next 30 days EPSS Score History
~ 6 %
Percentile, the proportion of vulnerabilities that are scored at or less

CVSS scores for CVE-2023-41333

Base Score Base Severity CVSS Vector Exploitability Score Impact Score Score Source First Seen
8.1
HIGH CVSS:3.1/AV:A/AC:L/PR:H/UI:N/S:C/C:N/I:H/A:H
1.7
5.8
NIST
6.9
MEDIUM CVSS:3.1/AV:A/AC:L/PR:H/UI:N/S:C/C:L/I:N/A:H
1.7
4.7
GitHub, Inc.

CWE ids for CVE-2023-41333

  • The product does not perform any authentication for functionality that requires a provable user identity or consumes a significant amount of resources.
    Assigned by: security-advisories@github.com (Primary)

References for CVE-2023-41333

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