CVE-2022-23606 Crash when a cluster is deleted in Envoy
An attacker can crash the Envoy proxy by triggering infinite recursion during cluster deletion with many idle connections, causing denial of service.
- Exploited in the wild
- Not known
- Login needed
- An administrator
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2022-23606?
CVE-2022-23606 is a medium-severity denial of service vulnerability in Envoyproxy Envoy, published on 22 Feb 2022. An attacker needs administrator access to exploit it, with no action from the victim.
Official description
Envoy is an open source edge and service proxy, designed for cloud-native applications. When a cluster is deleted via Cluster Discovery Service (CDS) all idle connections established to endpoints in that cluster are disconnected. A recursion was introduced in the procedure of disconnecting idle connections that can lead to stack exhaustion and abnormal process termination when a cluster has a large number of idle connections. This infinite recursion causes Envoy to crash. Users are advised to upgrade.
Weakness: CWE-674
Which versions are affected by CVE-2022-23606?
1 open source package ship an affected version, including envoy. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
envoy Bitnami | From 1.20.0 | 1.20.2, 1.21.1 |
Products include Envoyproxy Envoy.
How do I fix CVE-2022-23606?
Upgrade envoy to a fixed version for your release line: 1.20.2 or 1.21.1.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2022-23606 being exploited?
There is no known exploitation of CVE-2022-23606 in the wild and no public exploit code.
Other vulnerabilities in Envoyproxy Envoy
Sources
Also known as BIT-envoy-2022-23606, GHSA-9vp2-4cp7-vvxf.