CVE-2022-23635 Unauthenticated control plane denial of service attack in Istio

2022-02-2222:00:13

CWE-287

GitHub_M

www.cve.org

7.5 High

CVSS3

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

NONE

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

NONE

Integrity Impact

NONE

Availability Impact

HIGH

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

7.8 High

AI Score

Confidence

High

0.001 Low

EPSS

Percentile

46.6%

JSON

Istio is an open platform to connect, manage, and secure microservices. In affected versions the Istio control plane, istiod, is vulnerable to a request processing error, allowing a malicious attacker that sends a specially crafted message which results in the control plane crashing. This endpoint is served over TLS port 15012, but does not require any authentication from the attacker. For simple installations, Istiod is typically only reachable from within the cluster, limiting the blast radius. However, for some deployments, especially multicluster topologies, this port is exposed over the public internet. There are no effective workarounds, beyond upgrading. Limiting network access to Istiod to the minimal set of clients can help lessen the scope of the vulnerability to some extent.

CNA Affected

[
  {
    "product": "istio",
    "vendor": "istio",
    "versions": [
      {
        "status": "affected",
        "version": ">= 1.13.0, < 1.13.1"
      },
      {
        "status": "affected",
        "version": ">= 1.12.0, < 1.12.4"
      },
      {
        "status": "affected",
        "version": "< 1.11.7"
      }
    ]
  }
]