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CVE-2020-8933

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 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.

Priority

Medium

Cvss 3 Severity Score

7.8

Score breakdown

Status

Package Release Status
gce-compute-image-packages
Launchpad, Ubuntu, Debian
impish
Released (20190801-0ubuntu5)
focal
Released (20190801-0ubuntu4.1)
groovy
Released (20190801-0ubuntu5)
hirsute
Released (20190801-0ubuntu5)
jammy
Released (20190801-0ubuntu5)
kinetic
Released (20190801-0ubuntu5)
lunar
Released (20190801-0ubuntu5)
bionic
Released (20190801-0ubuntu1~18.04.1)
eoan
Released (20190801-0ubuntu1.1)
trusty Needed

upstream Needs triage

xenial
Released (20190801-0ubuntu1~16.04.1)
mantic
Released (20190801-0ubuntu5)

Severity score breakdown

Parameter Value
Base score 7.8
Attack vector Local
Attack complexity Low
Privileges required Low
User interaction None
Scope Unchanged
Confidentiality High
Integrity impact High
Availability impact High
Vector CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H