CVE-2020-8933

A vulnerability in Google Cloud Platform’s guest-oslogin versions between
20190304 and 20200507 allows a user that is only granted the role
“roles/compute.osLogin” to escalate privileges to root. Using the
membership to the “lxd” group, an attacker can attach host devices and
filesystems. Within an lxc container, it is possible to attach the host OS
filesystem and modify /etc/sudoers to then gain administrative privileges.
All images created after 2020-May-07 (20200507) are fixed, and if you
cannot update, we recommend you edit /etc/group/security.conf and remove
the “lxd” user from the OS Login entry.