| Name | CVE-2021-4120 |
| 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 |
| Source | CVE (at NVD; CERT, LWN, oss-sec, fulldisc, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more) |
Vulnerable and fixed packages
The table below lists information on source packages.
| Source Package | Release | Version | Status |
|---|
| snapd (PTS) | stretch (security) | 2.21-2+deb9u1 | vulnerable |
| stretch (lts), stretch | 2.21-2+deb9u3 | vulnerable |
| buster (security), buster, buster (lts) | 2.37.4-1+deb10u3 | vulnerable |
| bullseye (security), bullseye | 2.49-1+deb11u2 | fixed |
| bookworm | 2.57.6-1 | fixed |
| trixie | 2.65.3-1 | fixed |
| sid | 2.66.1-1 | fixed |
The information below is based on the following data on fixed versions.
| Package | Type | Release | Fixed Version | Urgency | Origin | Debian Bugs |
|---|
| snapd | source | bullseye | 2.49-1+deb11u1 | | | |
| snapd | source | (unstable) | 2.54.3-1 | | | |
Notes
[buster] - snapd <ignored> (Minor issue, intrusive backport)
https://bugs.launchpad.net/snapd/+bug/1949368
https://www.openwall.com/lists/oss-security/2022/02/18/2
[stretch] - snapd <ignored> (Minor issue, too intrusive to backport)