USN-6940-2: snapd vulnerabilities
13 January 2025
Several security issues were fixed in snapd.
Releases
Packages
- snapd - Daemon and tooling that enable snap packages
Details
USN-6940-1 fixed vulnerabilities in snapd. This update provides the
corresponding updates for Ubuntu 18.04 LTS and Ubuntu 16.04 LTS.
Original advisory details:
Neil McPhail discovered that snapd did not properly restrict writes to
the /home/jslarraz/bin path in the AppArmor profile for snaps using the home
plug. An attacker who could convince a user to install a malicious snap
could use this vulnerability to escape the snap sandbox. (CVE-2024-1724)
Zeyad Gouda discovered that snapd failed to properly check the file type
when extracting a snap. An attacker who could convince a user to install
a malicious snap containing non-regular files could then cause snapd to
block indefinitely while trying to read from such files and cause a
denial of service. (CVE-2024-29068)
Zeyad Gouda discovered that snapd failed to properly check the
destination of symbolic links when extracting a snap. An attacker who
could convince a user to install a malicious snap containing crafted
symbolic links could then cause snapd to write out the contents of the
symbolic link destination into a world-readable directory. This in-turn
could allow a local unprivileged user to gain access to privileged
information. (CVE-2024-29069)
Update instructions
The problem can be corrected by updating your system to the following package versions:
Ubuntu 18.04
-
snapd
-
2.61.4ubuntu0.18.04.1+esm1
Available with Ubuntu Pro
Ubuntu 16.04
-
snapd
-
2.61.4ubuntu0.16.04.1+esm1
Available with Ubuntu Pro
In general, a standard system update will make all the necessary changes.