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CVE-2020-8907: Priviged Escalation in Google Cloud Platform's Guest-OSLogin

• Severity: high (CVSS 7.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.3% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2020-06-22 · updated 2026-06-17
• Weakness: CWE-276

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 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.

Affected products

• Google LLC guest-oslogin: from 20190304.00 through 20200507.00
• openSUSE Leap: 15.1, 15.2

References

• http://lists.opensuse.org/opensuse-security-announce/2020-07/msg00037.html
• http://lists.opensuse.org/opensuse-security-announce/2020-07/msg00047.html
• https://cloud.google.com/support/bulletins/#gcp-2020-008
• https://github.com/GoogleCloudPlatform/guest-oslogin/pull/29
• https://gitlab.com/gitlab-com/gl-security/gl-redteam/red-team-tech-notes/-/tree/master/oslogin-privesc-june-2020
• http://lists.opensuse.org/opensuse-security-announce/2020-07/msg00037.html
• http://lists.opensuse.org/opensuse-security-announce/2020-07/msg00047.html
• https://cloud.google.com/support/bulletins/#gcp-2020-008
• https://github.com/GoogleCloudPlatform/guest-oslogin/pull/29
• https://gitlab.com/gitlab-com/gl-security/gl-redteam/red-team-tech-notes/-/tree/master/oslogin-privesc-june-2020

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