CVE-2020-27352
First published: Wed Feb 10 2021(Updated: )
When generating the systemd service units for the docker snap (and other similar snaps), snapd does not specify Delegate=yes - as a result systemd will move processes from the containers created and managed by these snaps into the cgroup of the main daemon within the snap itself when reloading system units. This may grant additional privileges to a container within the snap that were not originally intended.
Credit: security@ubuntu.com security@ubuntu.com
| Affected Software | Affected Version | How to fix |
|---|---|---|
| ubuntu/snapd | <2.48.3+18.04 | 2.48.3+18.04 |
| ubuntu/snapd | <2.48.3+20.04 | 2.48.3+20.04 |
| ubuntu/snapd | <2.48.3+20.10 | 2.48.3+20.10 |
| ubuntu/snapd | <2.48.3 | 2.48.3 |
| debian/snapd | 2.49-1+deb11u2 2.57.6-1 2.63-4 |
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Reference Links
- https://bugs.launchpad.net/snapd/+bug/1910456
- https://ubuntu.com/security/notices/USN-4728-1
- https://www.cve.org/CVERecord?id=CVE-2020-27352
- https://nvd.nist.gov/vuln/detail/CVE-2020-27352
- https://launchpad.net/bugs/cve/CVE-2020-27352
- https://security-tracker.debian.org/tracker/CVE-2020-27352
- https://ubuntu.com/security/CVE-2020-27352
- https://github.com/docker-snap/docker-snap/security/advisories/GHSA-798c-v3jq-h646
Frequently Asked Questions
What is the severity of CVE-2020-27352?
CVE-2020-27352 is considered a medium-severity vulnerability as it can affect the isolation of container processes.
How do I fix CVE-2020-27352?
To fix CVE-2020-27352, update the snapd package to version 2.49-1+deb11u2 or later.
Which versions of snapd are affected by CVE-2020-27352?
Affected versions of snapd include those prior to 2.49-1+deb11u2, specifically versions 2.48.3 for Ubuntu and older versions for Debian.
Can CVE-2020-27352 affect server applications?
Yes, CVE-2020-27352 can impact server applications that rely on Docker containers managed by affected snapd versions.
What impacts does CVE-2020-27352 have on system security?
CVE-2020-27352 compromises the cgroup isolation of container processes, potentially allowing them to interfere with each other.
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