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CVE-2021-44731

HIGHCVSS 7.8/10EPSS 0.97%

Last modified

CVE-2021-44731 is a high-severity vulnerability rated 7.8/10 on the CVSS scale. 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. EPSS estimates a 0.97% chance of exploitation in the next 30 days.

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

Metrics

CVSS 3.1
7.8/10

CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H

EPSS Probability
0.97%

57.2th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

VendorProductVersions
CanonicalSnapd<= 2.54.2
CanonicalUbuntu Linux18.04
CanonicalUbuntu Linux20.04
CanonicalUbuntu Linux21.10
FedoraprojectFedora34
FedoraprojectFedora35
DebianDebian Linux10.0
DebianDebian Linux11.0

References

Timeline

Published
Last Modified
Status
Modified

Frequently Asked Questions

What is CVE-2021-44731?
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
How severe is CVE-2021-44731?
CVE-2021-44731 has a CVSS score of 7.8/10 (HIGH severity). The EPSS model estimates a 0.97% probability of exploitation in the next 30 days.
How do I fix CVE-2021-44731?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2021-44731?

Run a free Strix scan to check your systems for this vulnerability.

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Source: NVD / NIST