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Vulnerability · Published Feb 22, 2022 · Assigned by GitHub_M

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

High 7.5

In plain English

A high-severity improper authentication in istio from istio. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 1.7% (higher than 77% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)7.5High
Exploit odds (30 days)1.7%top 23.4% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known

Official description

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](https://istio.io/latest/docs/setup/install/multicluster/primary-remote/) 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.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
Goistio.io/istio1.13.1GHSA-856q-xv3c-7f2f
Goistio.io/istio1.12.4GHSA-856q-xv3c-7f2f
Goistio.io/istio1.11.7GHSA-856q-xv3c-7f2f

Affected products (as reported)

VendorProductVersions
istio istio >= 1.13.0, < 1.13.1>= 1.12.0, < 1.12.4< 1.11.7

Weakness: CWE-287 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

References