- Vulnerability/
- USN-4728-1
USN-4728-1: snapd vulnerability
First published: Wed Feb 10 2021(Updated: )
Gilad Reti and Nimrod Stoler discovered that snapd did not correctly specify cgroup delegation when generating systemd service units for various container management snaps. This could allow a local attacker to escalate privileges via access to arbitrary devices of the container host from within a compromised or malicious container.
| Affected Software | Affected Version | How to fix |
|---|---|---|
| All of | ||
| ubuntu/snapd | <2.48.3+20.10 | 2.48.3+20.10 |
| Ubuntu | =20.10 | |
| All of | ||
| ubuntu/snapd | <2.48.3+20.04 | 2.48.3+20.04 |
| Ubuntu | =20.04 | |
| All of | ||
| ubuntu/snapd | <2.48.3+18.04 | 2.48.3+18.04 |
| Ubuntu | =18.04 | |
| All of | ||
| ubuntu/snapd | <2.48.3 | 2.48.3 |
| Ubuntu | =16.04 |
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Reference Links
- https://ubuntu.com/security/CVE-2020-27352
- https://launchpad.net/ubuntu/+source/snapd/2.48.3+20.10
- https://launchpad.net/ubuntu/+source/snapd/2.48.3+20.04
- https://launchpad.net/ubuntu/+source/snapd/2.48.3+18.04
- https://launchpad.net/ubuntu/+source/snapd/2.48.3
- https://ubuntu.com/security/notices/USN-4728-1 (Advisory)
Frequently Asked Questions
What is the severity of USN-4728-1?
The severity of USN-4728-1 is classified as high due to the potential for privilege escalation.
How do I fix USN-4728-1?
To fix USN-4728-1, update the snapd package to version 2.48.3 for your respective Ubuntu version.
Which versions of snapd are affected by USN-4728-1?
USN-4728-1 affects snapd versions prior to 2.48.3 for Ubuntu 20.10, 20.04, 18.04, and 16.04.
Who discovered the vulnerability in USN-4728-1?
The vulnerability in USN-4728-1 was discovered by researchers Gilad Reti and Nimrod Stoler.
What type of attack does USN-4728-1 mitigate?
USN-4728-1 mitigates a local privilege escalation attack through improper cgroup delegation in container management.
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