Vulnerability in Cilium
CVE-2023-41332
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.
EPSS: 0.004 (36.7th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 3.5 (Low). Vector: CVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L.
Affected products
- Cilium — versions >= 1.14.0, < 1.14.2, >= 1.13.0, < 1.13.7, < 1.12.14
Weakness classification (CWE)
Public proof-of-concept exploits
References
- security-advisories@github.com (x_refsource_CONFIRM, Exploit, Patch, Third Party Advisory, Mitigation)
- security-advisories@github.com (Exploit, Patch, x_refsource_MISC, Issue Tracking)
Frequently asked questions
- What is CVE-2023-41332?
- CVE-2023-41332 is a low-severity vulnerability in Cilium, classified under Improper Handling of Exceptional Conditions. CVSS score: 3.5/10. Published 2023-09-27.
- How severe is CVE-2023-41332?
- Low severity. CVSS v3 base score is 3.5 out of 10.
- Is CVE-2023-41332 known to be exploited?
- 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.