high
8.8
CWE
59
Advisory Published
Updated

CVE-2021-44730

First published: Thu Feb 17 2022(Updated: )

snapd 2.54.2 did not properly validate the location of the snap-confine binary. A local attacker who can hardlink this binary to another location to cause snap-confine to execute other arbitrary binaries and hence gain privilege escalation. Fixed in snapd versions 2.54.3+18.04, 2.54.3+20.04 and 2.54.3+21.10.1

Credit: security@ubuntu.com security@ubuntu.com

Affected SoftwareAffected VersionHow 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 Debian Linux=10.0
Debian Debian Linux=11.0
debian/snapd
2.37.4-1+deb10u1
2.37.4-1+deb10u3
2.49-1+deb11u2
2.57.6-1
2.61.2-2
ubuntu/snapd<2.54.3+18.04
2.54.3+18.04
ubuntu/snapd<2.54.3+20.04
2.54.3+20.04
ubuntu/snapd<2.54.3+21.10.1
2.54.3+21.10.1
ubuntu/snapd<2.54.3+14.04~
2.54.3+14.04~
ubuntu/snapd<2.54.3
2.54.3
ubuntu/snapd<2.54.3+16.04~
2.54.3+16.04~

Remedy

https://ubuntu.com/security/notices/USN-5292-1

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Reference Links

Parent vulnerabilities

(Appears in the following advisories)

Frequently Asked Questions

  • What is CVE-2021-44730?

    CVE-2021-44730 is a vulnerability in snapd 2.54.2 that allows a local attacker to execute arbitrary binaries with escalated privileges by hardlinking the snap-confine binary to another location.

  • What is the severity of CVE-2021-44730?

    CVE-2021-44730 has a severity score of 8.8, which is considered high.

  • How can I fix CVE-2021-44730?

    To fix CVE-2021-44730, update snapd to version 2.54.3+18.04, 2.54.3+20.04, or 2.54.3+21.10.1, depending on your system version.

  • What software versions are affected by CVE-2021-44730?

    Versions of snapd up to and including 2.54.2 are affected by CVE-2021-44730.

  • Where can I find more information about CVE-2021-44730?

    More information about CVE-2021-44730 can be found at the following references: [Reference 1](http://www.openwall.com/lists/oss-security/2022/02/18/2), [Reference 2](http://www.openwall.com/lists/oss-security/2022/02/23/1), [Reference 3](https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/3QTBN7LLZISXIA4KU4UKDR27Q5PXDS2U/).

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