CVE-2019-14891
Description
A flaw was found in cri-o, as a result of all pod-related processes being placed in the same memory cgroup. This can result in container management (conmon) processes being killed if a workload process triggers an out-of-memory (OOM) condition for the cgroup. An attacker could abuse this flaw to get host network access on an cri-o host.
Mitigation
As of cri-o v1.15 you can set conmon_cgroup = "system.slice" in the crio.runtime section of /etc/crio/crio.conf. On OpenShift Container Platform 4.x that can be done by following the documentation here:
https://access.redhat.com/documentation/en-us/openshift_container_platform/4.2/html/architecture/architecture-rhcos
For OpenShift Container Platform 3.x you can edit /etc/crio/crio.conf directly on the worker node if using cri-o on that version. Cri-o is not the default container engine on that version, Docker is.
Common Vulnerability Scoring System (CVSS) Score Details
Info alert:Important note
CVSS scores for open source components depend on vendor-specific factors (e.g. version or build chain). Therefore, Red Hat's score and impact rating can be different from NVD and other vendors. Red Hat remains the authoritative CVE Naming Authority (CNA) source for its products and services (see Red Hat classifications).
CVSS v3 Score Breakdown
| Red Hat | NVD | cve.org | |
|---|---|---|---|
| Base Score | 5 | 5 | N/A |
| Attack Vector | Network | Network | N/A |
| Attack Complexity | High | High | N/A |
| Privileges Required | Low | Low | N/A |
| User Interaction | None | None | N/A |
| Scope | Unchanged | Unchanged | N/A |
| Confidentiality | Low | Low | N/A |
| Integrity Impact | Low | Low | N/A |
| Availability Impact | Low | Low | N/A |
Vector
Red Hat: CVSS:3.0/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:L
NVD: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:L
Understanding the Weakness (CWE)
Other
Technical Impact: Varies by Context
The code could be left in a bad state.
Acknowledgements
Red Hat would like to thank Nick Freeman (Capsule8) for reporting this issue.
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