CVE-2022-24726

Unauthenticated control plane denial of service attack in Istio

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 when the validating webhook for a cluster is exposed publicly. This endpoint is served over TLS port 15017, 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 [external istiod](https://istio.io/latest/docs/setup/install/external-controlplane/) topologies, this port is exposed over the public internet. This issue has been patched in versions 1.13.2, 1.12.5 and 1.11.8. Users are advised to upgrade. Users unable to upgrade should disable access to a validating webhook that is exposed to the public internet or restrict the set of IP addresses that can query it to a set of known, trusted entities.

Category

7.5
CVSS
Severity: High
CVSS 3.1 •
CVSS 2.0 •
EPSS 0.39%
Third-Party Advisory github.com Third-Party Advisory github.com Third-Party Advisory github.com
Affected: istio istio
Published at:
Updated at:

References

Link Tags
https://github.com/istio/istio/security/advisories/GHSA-8w5h-qr4r-2h6g issue tracking third party advisory
https://github.com/golang/go/issues/51112 issue tracking third party advisory patch
https://github.com/istio/istio/commit/6ca5055a4db6695ef5504eabdfde3799f2ea91fd third party advisory patch

Frequently Asked Questions

What is the severity of CVE-2022-24726?
CVE-2022-24726 has been scored as a high severity vulnerability.
How to fix CVE-2022-24726?
To fix CVE-2022-24726, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2022-24726 being actively exploited in the wild?
As for now, there are no information to confirm that CVE-2022-24726 is being actively exploited. According to its EPSS score, there is a ~0% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
What software or system is affected by CVE-2022-24726?
CVE-2022-24726 affects istio istio.
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