Help Center> Application Service Mesh> Product Bulletin> Vulnerability Notices> Unauthenticated Control Plane DoS Attack (CVE-2022-23635)
Updated on 2024-05-11 GMT+08:00
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Unauthenticated Control Plane DoS Attack (CVE-2022-23635)

Description

Table 1 Vulnerability information

Vulnerability Type

CVE-ID

Discovered

DoS

CVE-2022-23635

2022-02-22

Impact Score

7.5 (high risk)

Trigger Conditions

  • For simple installations, Istiod is typically only reachable from within the cluster, limiting the blast radius.
  • For multi-cluster installations, port 15012 is exposed over a public network.

Root Cause

Istiod can process requests received on port 15012 even without authentication information. However, if there are too many requests sent to this port, Istiod will become unavailable.

Affected Versions

Istio earlier than 1.13.1

Patches

  • ASM 1.8.4-r5 or later
  • Istio 1.13.1 or later
  • Istio 1.12.4 or later
  • Istio 1.11.7 or later

Workarounds

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.

Helpful Links

Parent topic: Vulnerability Notices