CVE-2022-29227 Use after free in Envoy
A use-after-free bug in Envoy proxy can cause crashes when processing internal redirects, requiring an upgrade to mitigate.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2022-29227?
CVE-2022-29227 is a high-severity use after free vulnerability in Envoyproxy Envoy, published on 9 Jun 2022. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
Envoy is a cloud-native high-performance edge/middle/service proxy. In versions prior to 1.22.1 if Envoy attempts to send an internal redirect of an HTTP request consisting of more than HTTP headers, there’s a lifetime bug which can be triggered. If while replaying the request Envoy sends a local reply when the redirect headers are processed, the downstream state indicates that the downstream stream is not complete. On sending the local reply, Envoy will attempt to reset the upstream stream, but as it is actually complete, and deleted, this result in a use-after-free. Users are advised to upgrade. Users unable to upgrade are advised to disable internal redirects if crashes are observed.
Weakness: CWE-416
Which versions are affected by CVE-2022-29227?
1 open source package ship an affected version, including envoy. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
envoy Bitnami | All versions | 1.22.1 |
Products include Envoyproxy Envoy.
How do I fix CVE-2022-29227?
Upgrade envoy to 1.22.1 or later.
Upgrade to the fixed version. These bugs are found with fuzzing and sanitisers and avoided by memory-safe languages. More about Use after free.
Is CVE-2022-29227 being exploited?
There is no known exploitation of CVE-2022-29227 in the wild and no public exploit code.
Other vulnerabilities in Envoyproxy Envoy
Sources
Also known as BIT-envoy-2022-29227, GHSA-rm2p-qvf6-pvr6.