CVE-2020-8933

Public Exploit
Priviged Escalation in Google Cloud Platform's Guest-OSLogin

Description

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.

Category

9.3
CVSS
Severity: Critical
CVSS 4.0 •
CVSS 3.1 •
CVSS 2.0 •
EPSS 0.09%
Vendor Advisory opensuse.org Vendor Advisory opensuse.org Vendor Advisory google.com
Affected: Google LLC guest-oslogin
Published at:
Updated at:

References

Link Tags
https://github.com/GoogleCloudPlatform/guest-oslogin/pull/29 third party advisory patch
https://gitlab.com/gitlab-com/gl-security/gl-redteam/red-team-tech-notes/-/tree/master/oslogin-privesc-june-2020 third party advisory exploit
https://cloud.google.com/support/bulletins/#gcp-2020-008 vendor advisory
http://lists.opensuse.org/opensuse-security-announce/2020-07/msg00037.html mailing list third party advisory vendor advisory
http://lists.opensuse.org/opensuse-security-announce/2020-07/msg00047.html mailing list third party advisory vendor advisory

Frequently Asked Questions

What is the severity of CVE-2020-8933?
CVE-2020-8933 has been scored as a critical severity vulnerability.
How to fix CVE-2020-8933?
To fix CVE-2020-8933, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2020-8933 being actively exploited in the wild?
It is possible that CVE-2020-8933 is being exploited or will be exploited in a near future based on public information. According to its EPSS score, there is a ~0% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
What software or system is affected by CVE-2020-8933?
CVE-2020-8933 affects Google LLC guest-oslogin.
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