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CVE-2021-4120

HIGHCVSS 7.8/10EPSS 0.43%

Last modified

CVE-2021-4120 is a high-severity vulnerability rated 7.8/10 on the CVSS scale. snapd 2.54.2 fails to perform sufficient validation of snap content interface and layout paths, resulting in the ability for snaps to inject arbitrary AppArmor policy rules via malformed content interface and layout declarations and hence escape strict snap confinement. Fixed in snapd versions 2.54.3+18.04, 2.54.3+20.04 and 2.54.3+21.10.1. EPSS estimates a 0.43% chance of exploitation in the next 30 days.

Description

snapd 2.54.2 fails to perform sufficient validation of snap content interface and layout paths, resulting in the ability for snaps to inject arbitrary AppArmor policy rules via malformed content interface and layout declarations and hence escape strict snap confinement. 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:L/PR:L/UI:N/S:U/C:H/I:H/A:H

EPSS Probability
0.43%

34.4th 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

References

Timeline

Published
Last Modified
Status
Modified

Frequently Asked Questions

What is CVE-2021-4120?
snapd 2.54.2 fails to perform sufficient validation of snap content interface and layout paths, resulting in the ability for snaps to inject arbitrary AppArmor policy rules via malformed content interface and layout declarations and hence escape strict snap confinement. 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-2021-4120?
CVE-2021-4120 has a CVSS score of 7.8/10 (HIGH severity). The EPSS model estimates a 0.43% probability of exploitation in the next 30 days.
How do I fix CVE-2021-4120?
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.

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Source: NVD / NIST