CVE-2023-0296 Weak cryptography in Red Hat OpenShift

Medium 5.3 Published 17 Jan 2023 Updated 4 Apr 2025

The etcd grpc-proxy health check port uses weak 64-bit block ciphers, potentially allowing data exposure via birthday attacks, though impact is minimal.

Exploited in the wild: Not known
Login needed: Not needed
Attackable: Over the internet
Victim action needed: Not needed
Fix: None listed

What is CVE-2023-0296?

CVE-2023-0296 is a medium-severity vulnerability in Redhat Openshift, published on 17 Jan 2023. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

The Birthday attack against 64-bit block ciphers flaw (CVE-2016-2183) was reported for the health checks port (9979) on etcd grpc-proxy component. Even though the CVE-2016-2183 has been fixed in the etcd components, to enable periodic health checks from kubelet, it was necessary to open up a new port (9979) on etcd grpc-proxy, hence this port might be considered as still vulnerable to the same type of vulnerability. The health checks on etcd grpc-proxy do not contain sensitive data (only metrics data), therefore the potential impact related to this vulnerability is minimal. The CVE-2023-0296 has been assigned to this issue to track the permanent fix in the etcd component.

Weakness: CWE-327

Which versions are affected by CVE-2023-0296?

It affects 1 product.

Products include Redhat Openshift.

How do I fix CVE-2023-0296?

No fix has been published for CVE-2023-0296 yet. Limit exposure of the affected software until one is available.

Is CVE-2023-0296 being exploited?

There is no known exploitation of CVE-2023-0296 in the wild and no public exploit code.

All Redhat Openshift vulnerabilities

Sources

Also known as GHSA-wpff-vmpr-5q22.