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.
When an actor claims to have a given identity, the product does not prove or insufficiently proves that the claim is correct.
The product receives input that is expected to specify a quantity (such as size or length), but it does not validate or incorrectly validates that the quantity has the required properties.
| Link | Tags |
|---|---|
| https://github.com/istio/istio/security/advisories/GHSA-856q-xv3c-7f2f | third party advisory issue tracking |
| https://github.com/istio/istio/commit/5f3b5ed958ae75156f8656fe7b3794f78e94db84 | third party advisory patch |
| https://istio.io/latest/news/security/istio-security-2022-003 | third party advisory |