CRI-O Experimental Annotation Enables Unconfined Container, Scheduler Bypass
CVE-2023-6476 Published on January 9, 2024
Cri-o: pods are able to break out of resource confinement on cgroupv2
A flaw was found in CRI-O that involves an experimental annotation leading to a container being unconfined. This may allow a pod to specify and get any amount of memory/cpu, circumventing the kubernetes scheduler and potentially resulting in a denial of service in the node.
Vulnerability Analysis
CVE-2023-6476 is exploitable with network access, and requires small amount of user privileges. This vulnerability is considered to have a low attack complexity. The potential impact of an exploit of this vulnerability is considered to have no impact on confidentiality and integrity, and a high impact on availability.
Timeline
Reported to Red Hat.
Made public. 29 days later.
Weakness Type
Allocation of Resources Without Limits or Throttling
The software allocates a reusable resource or group of resources on behalf of an actor without imposing any restrictions on the size or number of resources that can be allocated, in violation of the intended security policy for that actor.
Products Associated with CVE-2023-6476
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Affected Versions
Red Hat OpenShift Container Platform 4.13:- Version 0:1.26.4-6.1.rhaos4.13.git9eb9cf3.el9 and below * is unaffected.
- Version 0:1.27.2-7.rhaos4.14.git1cc7a64.el9 and below * is unaffected.
Exploit Probability
EPSS (Exploit Prediction Scoring System) scores estimate the probability that a vulnerability will be exploited in the wild within the next 30 days. The percentile shows you how this score compares to all other vulnerabilities.