high
7.8
CWE
362
Advisory Published
Updated

CVE-2021-44731: Race Condition

First published: Thu Feb 17 2022(Updated: )

A race condition existed in the snapd 2.54.2 snap-confine binary when preparing a private mount namespace for a snap. This could allow a local attacker to gain root privileges by bind-mounting their own contents inside the snap's private mount namespace and causing snap-confine to execute arbitrary code 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-2021-44731?

    CVE-2021-44731 is a vulnerability that existed in the snapd 2.54.2 snap-confine binary when preparing a private mount namespace for a snap, allowing a local attacker to gain root privileges.

  • How severe is CVE-2021-44731?

    CVE-2021-44731 has a severity score of 7.8 (high).

  • Which software versions are affected by CVE-2021-44731?

    The affected software versions include snapd 2.37.4-1+deb10u1, 2.37.4-1+deb10u3, 2.49-1+deb11u2, 2.57.6-1, and 2.60.2-1 on Debian, as well as snapd 2.54.3+18.04 on Ubuntu 18.04 LTS, snapd 2.54.3+20.04 on Ubuntu 20.04 LTS, snapd 2.54.3+21.10.1 on Ubuntu 21.10, and snapd 2.54.3 (upstream version) on Ubuntu (all versions).

  • How can I fix CVE-2021-44731?

    To fix CVE-2021-44731, update snapd to version 2.54.3+18.04 on Ubuntu 18.04 LTS, 2.54.3+20.04 on Ubuntu 20.04 LTS, 2.54.3+21.10.1 on Ubuntu 21.10, or 2.54.3 (upstream version) on Ubuntu (all versions). For Debian, update to snapd versions 2.37.4-1+deb10u1, 2.37.4-1+deb10u3, 2.49-1+deb11u2, 2.57.6-1, or 2.60.2-1.

  • Where can I find more information about CVE-2021-44731?

    You can find more information about CVE-2021-44731 at the following references: [1] http://packetstormsecurity.com/files/170176/snap-confine-must_mkdir_and_open_with_perms-Race-Condition.html [2] http://seclists.org/fulldisclosure/2022/Dec/4 [3] http://www.openwall.com/lists/oss-security/2022/02/18/2

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