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  5. CVE-2023-27594

CVE-2023-27594: Improper Authorization

March 17, 2023

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.

References

  • github.com/advisories/GHSA-8fg8-jh2h-f2hc
  • github.com/cilium/cilium/releases/tag/v1.11.15
  • github.com/cilium/cilium/releases/tag/v1.12.8
  • github.com/cilium/cilium/releases/tag/v1.13.1
  • github.com/cilium/cilium/security/advisories/GHSA-8fg8-jh2h-f2hc
  • nvd.nist.gov/vuln/detail/CVE-2023-27594

Code Behaviors & Features

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Affected versions

All versions before 1.11.15, all versions starting from 1.12.0 before 1.12.8, all versions starting from 1.13.0 before 1.13.1

Fixed versions

  • 1.11.15
  • 1.12.8
  • 1.13.1

Solution

Upgrade to versions 1.11.15, 1.12.8, 1.13.1 or above.

Impact 7.3 HIGH

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L

Learn more about CVSS

Weakness

  • CWE-285: Improper Authorization

Source file

go/github.com/cilium/cilium/CVE-2023-27594.yml

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