Security Bulletin
This security bulletin contains one low risk vulnerability.
EUVDB-ID: #VU34052
Risk: Low
CVSSv3.1: 4.8 [CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C]
CVE-ID: CVE-2020-8557
CWE-ID:
CWE-400 - Resource exhaustion
Exploit availability: No
DescriptionThe vulnerability allows a local authenticated user to perform a denial of service (DoS) attack.
The Kubernetes kubelet component in versions 1.1-1.16.12, 1.17.0-1.17.8 and 1.18.0-1.18.5 do not account for disk usage by a pod which writes to its own /etc/hosts file. The /etc/hosts file mounted in a pod by kubelet is not included by the kubelet eviction manager when calculating ephemeral storage usage by a pod. If a pod writes a large amount of data to the /etc/hosts file, it could fill the storage space of the node and cause the node to fail.
MitigationInstall updates from vendor's website.
openshift-kuryr (Red Hat package): 3.11.153-1.git.1.073ef06.el7 - 3.11.524-1.git.b234b49.el7
openshift-enterprise-cluster-capacity (Red Hat package): 3.11.16-1.git.380.1406f2f.el7 - 3.11.524-1.git.22be164.el7
openshift-enterprise-autoheal (Red Hat package): 3.11.16-1.git.219.5443970.el7 - 3.11.524-1.git.f2f435d.el7
openshift-ansible (Red Hat package): 3.11.16-1.git.0.4ac6f81.el7 - 3.11.524-1.git.0.150f8a9.el7
golang-github-prometheus-prometheus (Red Hat package): 3.11.16-1.git.5020.5e81ed1.el7 - 3.11.524-1.git.99aae51.el7
golang-github-prometheus-node_exporter (Red Hat package): 3.11.16-1.git.1056.1583d2a.el7 - 3.11.524-1.git.609cd20.el7
golang-github-prometheus-alertmanager (Red Hat package): 3.11.16-1.git.0.be735ec.el7 - 3.11.524-1.git.13de638.el7
golang-github-openshift-oauth-proxy (Red Hat package): 3.11.16-1.git.409.922769e.el7 - 3.11.524-1.git.edebe84.el7
atomic-openshift-web-console (Red Hat package): 3.11.16-1.git.289.ecf7441.el7 - 3.11.524-1.git.56ad978.el7
atomic-openshift-service-idler (Red Hat package): 3.11.16-1.git.14.a65cbf0.el7 - 3.11.524-1.git.39cfc66.el7
atomic-openshift-node-problem-detector (Red Hat package): 3.11.16-1.git.198.95f4dfa.el7 - 3.11.524-1.git.c8f26da.el7
atomic-openshift-metrics-server (Red Hat package): 3.11.16-1.git.52.9fd74a8.el7 - 3.11.524-1.git.f8bf728.el7
atomic-openshift-dockerregistry (Red Hat package): 3.11.51-1.git.446.d29ce0e.el7 - 3.11.524-1.git.3571208.el7
atomic-openshift-descheduler (Red Hat package): 3.11.16-1.git.300.abfab3c.el7 - 3.11.524-1.git.d435537.el7
atomic-openshift-cluster-autoscaler (Red Hat package): 3.11.16-1.git.0.8c8305e.el7 - 3.11.524-1.git.99b2acf.el7
atomic-openshift (Red Hat package): 3.11.16-1.git.0.b48b8f8.el7 - 3.11.524-1.git.0.2dffce7.el7
atomic-enterprise-service-catalog (Red Hat package): 3.11.16-1.git.1633.05087cb.el7 - 3.11.524-1.git.2e6be86.el7
Red Hat OpenShift Container Platform: 3.11.0 - 3.11.524
External linkshttp://access.redhat.com/errata/RHSA-2021:3915
Q & A
Can this vulnerability be exploited remotely?
No. This vulnerability can be exploited locally. The attacker should have authentication credentials and successfully authenticate on the system.
Is there known malware, which exploits this vulnerability?
No. We are not aware of malware exploiting this vulnerability.