CVE-2021-3636 Security feature bypass in openshift
Attackers compromising additional CAs can masquerade as trusted in-cluster services due to incorrect Service CA certificate generation in OpenShift.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2021-3636?
CVE-2021-3636 is a medium-severity vulnerability in Redhat Openshift, published on 30 Jul 2021. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
It was found in OpenShift, before version 4.8, that the generated certificate for the in-cluster Service CA, incorrectly included additional certificates. The Service CA is automatically mounted into all pods, allowing them to safely connect to trusted in-cluster services that present certificates signed by the trusted Service CA. The incorrect inclusion of additional CAs in this certificate would allow an attacker that compromises any of the additional CAs to masquerade as a trusted in-cluster service.
Which versions are affected by CVE-2021-3636?
It affects 1 product.
Products include Redhat Openshift.
How do I fix CVE-2021-3636?
Upgrade to a fixed version.
Is CVE-2021-3636 being exploited?
There is no known exploitation of CVE-2021-3636 in the wild and no public exploit code.
Other vulnerabilities in Redhat Openshift
Sources
Also known as GHSA-6fcp-x27g-fqqw.