CVE-2021-20188
First published: Wed Jan 13 2021(Updated: )
A flaw was found in podman before 1.7.0. File permissions for non-root users running in a privileged container are not correctly checked. This flaw can be abused by a low-privileged user inside the container to access any other file in the container, even if owned by the root user inside the container. It does not allow to directly escape the container, though being a privileged container means that a lot of security features are disabled when running the container. 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/podman | <1.7.0 | 1.7.0 |
| Podman Project Podman | <1.7.0 | |
| Redhat Openshift Container Platform | =3.11 | |
| Redhat Enterprise Linux | =7.0 | |
| Redhat Enterprise Linux | =8.0 |
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Reference Links
- https://bugzilla.redhat.com/show_bug.cgi?id=1915734
- https://access.redhat.com/security/cve/CVE-2018-10856
- https://github.com/containers/podman/commit/dcf3c742b1ac4d641d66810113f3d17441a412f4
- https://bugzilla.redhat.com/show_bug.cgi/attachment.cgi?id=1749548&action=diff
- https://bugzilla.redhat.com/show_bug.cgi/attachment.cgi?id=1749548&action=edit
- https://bugzilla.redhat.com/show_bug.cgi/attachment.cgi?id=1750688&action=diff
- https://bugzilla.redhat.com/show_bug.cgi/attachment.cgi?id=1750688&action=edit
- https://github.com/containers/podman/commit/2c7b579fe7328dc6db48bdaf60d0ddd9136b1e24
- https://github.com/containers/podman/commit/c8bd4746151e6ae37d49c4688f2f64e03db429fc
- https://access.redhat.com/errata/RHSA-2020:3053
- https://access.redhat.com/security/cve/cve-2021-20188
- https://access.redhat.com/errata/RHSA-2021:0681
- https://access.redhat.com/errata/RHSA-2021:0705
- https://access.redhat.com/errata/RHSA-2021:0706
- https://access.redhat.com/errata/RHSA-2021:0710
Frequently Asked Questions
What is CVE-2021-20188?
CVE-2021-20188 is a vulnerability in podman before version 1.7.0 that allows non-root users running in a privileged container to access any file in the container, even if owned by the root user.
What software is affected by CVE-2021-20188?
Podman before version 1.7.0, Red Hat OpenShift Container Platform 3.11, Red Hat Enterprise Linux 7.0, and Red Hat Enterprise Linux 8.0 are affected by CVE-2021-20188.
How severe is CVE-2021-20188?
CVE-2021-20188 has a severity level of 7, which is considered high.
How can the vulnerability be fixed?
To fix CVE-2021-20188, update podman to version 1.7.0 or later.
Where can I find more information about CVE-2021-20188?
You can find more information about CVE-2021-20188 on Red Hat's Bugzilla, Red Hat's CVE page, and the GitHub repository for podman.
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