CVE-2021-3344
First published: Thu Jan 28 2021(Updated: )
A privilege escalation flaw was found in OpenShift builder. During build time, credentials outside the build context are automatically mounted into the container image under construction. An OpenShift user, able to execute code during build time inside this container can re-use the credentials to overwrite arbitrary container images in internal registries and/or escalate their privileges. The highest threat from this vulnerability is to data confidentiality and integrity as well as system availability.
Credit: secalert@redhat.com
| Affected Software | Affected Version | How to fix |
|---|---|---|
| redhat/github.com/openshift/builder v0.0.0-20210125201112 | <7901 | 7901 |
| Redhat Openshift Builder | <2021-01-26 | |
| Redhat Openshift Container Platform | >=4.5<4.5.33 | |
| Redhat Openshift Container Platform | >=4.6<4.6.16 |
Remedy
The affected build strategies include docker, source and custom builds, hence these can be disabled as per the documentation[1]. This does however, exclude the Jenkins build strategy as it is not affected and does not have to be disabled. [1] https://docs.openshift.com/container-platform/4.6/builds/securing-builds-by-strategy.html On clusters where builds are allowed only grant permissions to perform builds to users who you wish to be to able to view, modify and edit all cluster resources.
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Reference Links
- https://bugzilla.redhat.com/show_bug.cgi?id=1921450
- https://github.com/openshift/builder/pull/206
- https://access.redhat.com/errata/RHSA-2021:0308
- https://access.redhat.com/security/cve/cve-2021-3344
- https://docs.openshift.com/container-platform/4.6/builds/securing-builds-by-strategy.html
- https://access.redhat.com/errata/RHSA-2021:0428
- https://www.cve.org/CVERecord?id=CVE-2021-3344 https://nvd.nist.gov/vuln/detail/CVE-2021-3344
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