CVE-2021-44731

Public Exploit
snapd could be made to escalate privileges and run programs as administrator

Description

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

Category

7.8
CVSS
Severity: High
CVSS 3.1 •
CVSS 2.0 •
EPSS 2.30% Top 20%
Vendor Advisory fedoraproject.org Vendor Advisory fedoraproject.org Vendor Advisory debian.org Vendor Advisory ubuntu.com
Affected: Canonical Ltd. snapd
Published at:
Updated at:

References

Link Tags
https://ubuntu.com/security/notices/USN-5292-1 patch vendor advisory
http://www.openwall.com/lists/oss-security/2022/02/18/2 third party advisory mailing list
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/3QTBN7LLZISXIA4KU4UKDR27Q5PXDS2U/ vendor advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/XCGHG6LJAVJJ72TMART6A7N4Z6MSTGI7/ vendor advisory
https://www.debian.org/security/2022/dsa-5080 issue tracking third party advisory vendor advisory
http://www.openwall.com/lists/oss-security/2022/02/23/1 mailing list exploit third party advisory
http://www.openwall.com/lists/oss-security/2022/02/23/2 third party advisory mailing list
http://www.openwall.com/lists/oss-security/2022/11/30/2 mailing list exploit third party advisory
http://seclists.org/fulldisclosure/2022/Dec/4 mailing list exploit third party advisory
http://packetstormsecurity.com/files/170176/snap-confine-must_mkdir_and_open_with_perms-Race-Condition.html exploit vdb entry third party advisory

Frequently Asked Questions

What is the severity of CVE-2021-44731?
CVE-2021-44731 has been scored as a high severity vulnerability.
How to fix CVE-2021-44731?
To fix CVE-2021-44731, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2021-44731 being actively exploited in the wild?
It is possible that CVE-2021-44731 is being exploited or will be exploited in a near future based on public information. According to its EPSS score, there is a ~2% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
What software or system is affected by CVE-2021-44731?
CVE-2021-44731 affects Canonical Ltd. snapd.
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