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CVE-2023-30851 Explained : Impact and Mitigation

Discover how CVE-2023-30851 impacts Cilium users with potential HTTP policy bypass issues. Learn about affected versions, exploitation risks, and mitigation steps here.

Cilium is a networking, observability, and security solution with an eBPF-based dataplane. This article highlights the potential HTTP policy bypass when using header rules in Cilium.

Understanding CVE-2023-30851

This CVE identifies a vulnerability in Cilium that could lead to a potential HTTP policy bypass when utilizing header rules.

What is CVE-2023-30851?

The issue impacts users with an HTTP policy applying to multiple

toEndpoints
and an allow-all rule affecting only one of those endpoints. This scenario may cause the addition of a wildcard rule to the HTTP rules, enabling the bypass of HTTP policies.

The Impact of CVE-2023-30851

The vulnerability could allow threat actors to circumvent HTTP policies, leading to potential security breaches and unauthorized access.

Technical Details of CVE-2023-30851

This section delves into the specifics of the vulnerability in Cilium.

Vulnerability Description

The vulnerability in Cilium versions prior to 1.11.16, 1.12.9, and 1.13.2 could result in an HTTP policy bypass under specific conditions, potentially compromising network security.

Affected Systems and Versions

        Cilium versions < 1.11.16 are affected.
        Cilium versions >= 1.12.0, < 1.12.9 are impacted.
        Cilium versions >= 1.13.0, < 1.13.2 are vulnerable.

Exploitation Mechanism

Threat actors can exploit this vulnerability by manipulating header rules to introduce a wildcard rule, subsequently evading existing HTTP policies.

Mitigation and Prevention

Learn how to address and prevent the CVE-2023-30851 vulnerability in Cilium.

Immediate Steps to Take

        Update Cilium to versions 1.11.16, 1.12.9, or 1.13.2 to patch the vulnerability.
        Review and adjust HTTP policies to mitigate the risk of bypass.

Long-Term Security Practices

Regularly update Cilium and implement comprehensive network security measures to protect against similar vulnerabilities.

Patching and Updates

Refer to the latest releases of Cilium, like v1.11.16, v1.12.9, and v1.13.2, to ensure your system is secure.

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