CVE-2021-4120: snapd could be made to bypass intended access restrictions through snap content interfaces and layout paths
First published: Thu Feb 17 2022(Updated: )
Last updated 24 July 2024
Credit: security@ubuntu.com security@ubuntu.com
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Canonical snapd | <=2.54.2 | |
| Canonical Ubuntu Linux | =18.04 | |
| Canonical Ubuntu Linux | =20.04 | |
| Canonical Ubuntu Linux | =21.10 | |
| Fedoraproject Fedora | =34 | |
| Fedoraproject Fedora | =35 | |
| debian/snapd | 2.49-1+deb11u2 2.57.6-1 2.65.3-1 2.66.1-1 |
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Reference Links
- http://www.openwall.com/lists/oss-security/2022/02/18/2
- https://bugs.launchpad.net/snapd/+bug/1949368
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/3QTBN7LLZISXIA4KU4UKDR27Q5PXDS2U/
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/XCGHG6LJAVJJ72TMART6A7N4Z6MSTGI7/
- https://ubuntu.com/security/notices/USN-5292-1
- https://launchpad.net/bugs/cve/CVE-2021-4120
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/3QTBN7LLZISXIA4KU4UKDR27Q5PXDS2U/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/XCGHG6LJAVJJ72TMART6A7N4Z6MSTGI7/
- https://www.openwall.com/lists/oss-security/2022/02/18/2
- https://security-tracker.debian.org/tracker/CVE-2021-4120
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-4120
- https://nvd.nist.gov/vuln/detail/CVE-2021-4120
- https://ubuntu.com/security/CVE-2021-4120
Frequently Asked Questions
What is CVE-2021-4120?
CVE-2021-4120 is a vulnerability in snapd 2.54.2 that allows snaps to inject arbitrary AppArmor policy rules and escape strict snap confinement.
How severe is CVE-2021-4120?
CVE-2021-4120 has a severity rating of 7.8 (high).
Which versions of snapd are affected?
Version 2.54.2 of snapd is affected.
How can I fix CVE-2021-4120?
To fix CVE-2021-4120, update snapd to version 2.54.3 or higher.
Where can I find more information about CVE-2021-4120?
You can find more information about CVE-2021-4120 at the following references: [Link 1](http://www.openwall.com/lists/oss-security/2022/02/18/2), [Link 2](https://bugs.launchpad.net/snapd/+bug/1949368), [Link 3](https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/3QTBN7LLZISXIA4KU4UKDR27Q5PXDS2U/).
- collector/nvd-index
- agent/type
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- source/Launchpad
- agent/author
- agent/weakness
- agent/remedy
- collector/mitre-cve
- source/MITRE
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- collector/usn-cve
- source/Ubuntu
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- collector/security-tracker-debian
- source/Debian
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- agent/last-modified-date
- agent/event
- collector/nvd-cve
- source/NVD
- agent/softwarecombine
- agent/trending
- vendor/canonical
- canonical/canonical snapd
- version/canonical snapd/2.54.2
- canonical/canonical ubuntu linux
- version/canonical ubuntu linux/18.04
- version/canonical ubuntu linux/20.04
- version/canonical ubuntu linux/21.10
- vendor/fedoraproject
- canonical/fedoraproject fedora
- version/fedoraproject fedora/34
- version/fedoraproject fedora/35
- package-manager/debian