CVE-2023-27594 Cilium vulnerable to potential network policy bypass when routing IPv6 traffic

2023-03-1719:56:43

CWE-285

GitHub_M

www.cve.org

cilium

vulnerability

network policy

bypass

ipv6

traffic

ebpf

dataplane

version 1.11.15

version 1.12.8

version 1.13.1

nodeports

pods

endpoint routes

workaround

disable.

4.2 Medium

CVSS3

Attack Vector

ADJACENT

Attack Complexity

HIGH

Privileges Required

NONE

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

LOW

Integrity Impact

LOW

Availability Impact

NONE

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

0.001 Low

EPSS

Percentile

45.0%

JSON

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.

CNA Affected

[
  {
    "vendor": "cilium",
    "product": "cilium",
    "versions": [
      {
        "version": "< 1.11.15",
        "status": "affected"
      },
      {
        "version": ">= 1.12.0, < 1.12.8",
        "status": "affected"
      },
      {
        "version": ">= 1.13.0, < 1.13.1",
        "status": "affected"
      }
    ]
  }
]