Vulnerability Details : CVE-2023-27594
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.
Vulnerability category: BypassGain privilege
Exploit prediction scoring system (EPSS) score for CVE-2023-27594
Probability of exploitation activity in the next 30 days: 0.11%
Percentile, the proportion of vulnerabilities that are scored at or less: ~ 44 % EPSS Score History EPSS FAQ
CVSS scores for CVE-2023-27594
Base Score | Base Severity | CVSS Vector | Exploitability Score | Impact Score | Score Source |
---|---|---|---|---|---|
7.3
|
HIGH | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L |
3.9
|
3.4
|
NIST |
4.2
|
MEDIUM | CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N |
1.6
|
2.5
|
GitHub, Inc. |
CWE ids for CVE-2023-27594
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The product does not perform or incorrectly performs an authorization check when an actor attempts to access a resource or perform an action.Assigned by: security-advisories@github.com (Secondary)
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The product performs an authorization check when an actor attempts to access a resource or perform an action, but it does not correctly perform the check. This allows attackers to bypass intended access restrictions.Assigned by: nvd@nist.gov (Primary)
References for CVE-2023-27594
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https://github.com/cilium/cilium/releases/tag/v1.12.8
Release 1.12.8 · cilium/cilium · GitHubThird Party Advisory
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https://github.com/cilium/cilium/releases/tag/v1.11.15
Release 1.11.15 · cilium/cilium · GitHubThird Party Advisory
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https://github.com/cilium/cilium/releases/tag/v1.13.1
Release 1.13.1 · cilium/cilium · GitHubThird Party Advisory
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https://github.com/cilium/cilium/security/advisories/GHSA-8fg8-jh2h-f2hc
Potential network policy bypass when routing IPv6 traffic · Advisory · cilium/cilium · GitHubThird Party Advisory
Products affected by CVE-2023-27594
- cpe:2.3:a:cilium:cilium:*:*:*:*:*:*:*:*
- cpe:2.3:a:cilium:cilium:*:*:*:*:*:*:*:*
- cpe:2.3:a:cilium:cilium:*:*:*:*:*:*:*:*