CVE-2020-8907

Published: 22 June 2020

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 their membership to the "docker" group, an attacker with this role is able to run docker and mount the host OS. Within docker, it is possible to modify the host OS filesystem and modify /etc/groups to 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 "docker" user from the OS Login entry.

Priority

Medium

CVSS 3 base score: 7.8

Status

Package Release Status
gce-compute-image-packages
Launchpad, Ubuntu, Debian
Upstream Needs triage

Ubuntu 20.10 (Groovy Gorilla)
Released (20190801-0ubuntu5)
Ubuntu 20.04 LTS (Focal Fossa)
Released (20190801-0ubuntu4.1)
Ubuntu 18.04 LTS (Bionic Beaver)
Released (20190801-0ubuntu1~18.04.1)
Ubuntu 16.04 LTS (Xenial Xerus)
Released (20190801-0ubuntu1~16.04.1)
Ubuntu 14.04 ESM (Trusty Tahr) Needed