CVE-2021-20218: Path Traversal
First published: Tue Jan 12 2021(Updated: )
A flaw was found in the fabric8 kubernetes-client in version 4.2.0 and after. This flaw allows a malicious pod/container to cause applications using the fabric8 kubernetes-client `copy` command to extract files outside the working path. The highest threat from this vulnerability is to integrity and system availability. This has been fixed in kubernetes-client-4.13.2 kubernetes-client-5.0.2 kubernetes-client-4.11.2 kubernetes-client-4.7.2
Credit: secalert@redhat.com
| Affected Software | Affected Version | How to fix |
|---|---|---|
| redhat/jenkins | <2-plugins-0:4.7.1616671397-1.el8 | 2-plugins-0:4.7.1616671397-1.el8 |
| Redhat Kubernetes-client | >=4.2.0<4.7.2 | |
| Redhat Kubernetes-client | >=4.8.0<4.11.2 | |
| Redhat Kubernetes-client | >=4.12.0<4.13.2 | |
| Redhat Kubernetes-client | >=5.0.0<5.0.2 | |
| Redhat A-mq Online | ||
| Redhat Build Of Quarkus | ||
| Redhat Codeready Studio | =12.0 | |
| Redhat Descision Manager | =7.0 | |
| Redhat Integration Camel K | ||
| Redhat Jboss Fuse | =7.0.0 | |
| Redhat Openshift Container Platform | =3.11 | |
| Redhat Process Automation | =7.0 |
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Reference Links
- https://github.com/fabric8io/kubernetes-client/issues/2715
- https://access.redhat.com/errata/RHSA-2021:0986
- https://access.redhat.com/security/cve/cve-2021-20218
- https://access.redhat.com/errata/RHSA-2021:1004
- https://access.redhat.com/errata/RHSA-2021:3205
- https://access.redhat.com/errata/RHSA-2021:3207
- https://access.redhat.com/errata/RHSA-2021:5134
- https://access.redhat.com/errata/RHSA-2022:0296
- https://access.redhat.com/errata/RHSA-2022:0297
- https://bugzilla.redhat.com/show_bug.cgi?id=1923405
- https://www.cve.org/CVERecord?id=CVE-2021-20218 https://nvd.nist.gov/vuln/detail/CVE-2021-20218 https://github.com/fabric8io/kubernetes-client/issues/2715
- https://access.redhat.com/errata/RHSA-2021:1006
Parent vulnerabilities
(Appears in the following advisories)
Frequently Asked Questions
What is CVE-2021-20218?
CVE-2021-20218 is a vulnerability in the fabric8 kubernetes-client that allows a malicious pod/container to extract files outside the working path.
What is the impact of CVE-2021-20218?
The highest threat from CVE-2021-20218 is to integrity.
How can a malicious pod/container exploit CVE-2021-20218?
A malicious pod/container can exploit CVE-2021-20218 by using the fabric8 kubernetes-client 'copy' command to extract files outside the working path.
Which versions of fabric8 kubernetes-client are affected by CVE-2021-20218?
Versions 4.2.0 and after of the fabric8 kubernetes-client are affected by CVE-2021-20218.
Where can I find more information about CVE-2021-20218?
You can find more information about CVE-2021-20218 on the GitHub issue page and the Red Hat security advisory.
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