[USN-6125-1] snapd vulnerability
alex.murray at canonical.com
Wed May 31 02:55:37 UTC 2023
Ubuntu Security Notice USN-6125-1
May 31, 2023
A security issue affects these releases of Ubuntu and its derivatives:
- Ubuntu 23.04
- Ubuntu 22.10
- Ubuntu 22.04 LTS
- Ubuntu 20.04 LTS
- Ubuntu 18.04 LTS
- Ubuntu 16.04 LTS (Available with Ubuntu Pro)
An intended access restriction in snapd could be bypassed by strict mode snaps.
- snapd: Daemon and tooling that enable snap packages
It was discovered that the snap sandbox did not restrict the use of the
ioctl system call with a TIOCLINUX request. This could be exploited by a
malicious snap to inject commands into the controlling terminal which would
then be executed outside of the snap sandbox once the snap had exited. This
could allow an attacker to execute arbitrary commands outside of the
confined snap sandbox. Note: graphical terminal emulators like xterm,
gnome-terminal and others are not affected - this can only be exploited
when snaps are run on a virtual console.
The problem can be corrected by updating your system to the following
Ubuntu 22.04 LTS:
Ubuntu 20.04 LTS:
Ubuntu 18.04 LTS:
Ubuntu 16.04 LTS (Available with Ubuntu Pro):
In general, a standard system update will make all the necessary changes.
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