CVE-2020-14336
First published: Mon Jul 13 2020(Updated: )
A flaw was found in the Restricted Security Context Constraints (SCC), where it allows pods to craft custom network packets. This flaw allows an attacker to cause a denial of service attack on an OpenShift Container Platform cluster if they can deploy pods. The highest threat from this vulnerability is to system availability.
Credit: secalert@redhat.com
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Redhat Openshift Container Platform | =3.11 | |
| Redhat Openshift Container Platform | =4.5.16 | |
| Redhat Openshift Container Platform | =4.6 |
Remedy
On OCP 3.11 create a custom SCC based on 'restricted' and also drop the NET_RAW capability[1]. Assign this custom SCC to any users, or groups which create pods you want to protect. See the documentation for more information [2]. [1] https://access.redhat.com/solutions/5611521 [2] https://docs.openshift.com/container-platform/3.11/admin_guide/manage_scc.html
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Reference Links
- https://bugzilla.redhat.com/show_bug.cgi?id=1858981
- https://docs.docker.com/engine/reference/run/#runtime-privilege-and-linux-capabilities
- https://github.com/opencontainers/runc/blob/master/libcontainer/SPEC.md#security
- https://docs.openshift.com/container-platform/3.11/architecture/networking/network_plugins.html
- https://access.redhat.com/errata/RHSA-2020:4320
- https://access.redhat.com/security/cve/cve-2020-14336
- https://access.redhat.com/errata/RHSA-2020:4298
- https://access.redhat.com/solutions/5611521
- https://docs.openshift.com/container-platform/3.11/admin_guide/manage_scc.html
- https://www.cve.org/CVERecord?id=CVE-2020-14336 https://nvd.nist.gov/vuln/detail/CVE-2020-14336
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