CVE-2022-23635 Information

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 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.

CVSS Vector

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

Reference

https://istio.io/latest/news/security/istio-security-2022-003 https://github.com/istio/istio/commit/5f3b5ed958ae75156f8656fe7b3794f78e94db84 https://github.com/istio/istio/security/advisories/GHSA-856q-xv3c-7f2f

Attack Complexity

LOW

Privileges Required

NONE

User Interaction Required

NONE

Scope

NONE

Confidentiality Impact

UNCHANGED

Integrity Impact

NONE

Availability Impact

NONE

Base Score

HIGH

Base Severity

7.5