CVE-2022-21701 Information

Description

Istio is an open platform to connect manage and secure microservices. In versions 1.12.0 and 1.12.1 Istio is vulnerable to a privilege escalation attack. Users who have CREATE permission for gateways.gateway.networking.k8s.io objects can escalate this privilege to create other resources that they may not have access to such as Pod. This vulnerability impacts only an Alpha level feature the Kubernetes Gateway API. This is not the same as the Istio Gateway type (gateways.networking.istio.io) which is not vulnerable. Users are advised to upgrade to resolve this issue. Users unable to upgrade should implement any of the following which will prevent this vulnerability: Remove the gateways.gateway.networking.k8s.io CustomResourceDefinition set PILOT_ENABLE_GATEWAY_API_DEPLOYMENT_CONTROLLER=true environment variable in Istiod or remove CREATE permissions for gateways.gateway.networking.k8s.io objects from untrusted users.

CVSS Vector

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

Reference

https://istio.io/latest/news/releases/1.12.x/announcing-1.12.2/ https://github.com/istio/istio/security/advisories/GHSA-mq8f-9446-c28r

Attack Complexity

LOW

Privileges Required

LOW

User Interaction Required

LOW

Scope

NONE

Confidentiality Impact

UNCHANGED

Integrity Impact

HIGH

Availability Impact

HIGH

Base Score

HIGH

Base Severity

8.8