PT-2020-3711 · Google Cloud Platform+1 · Guest-Oslogin+1

Chris Moberly + 1 · Published 2020-06-19 · Updated 2024-05-21 · CVE-2020-8907

Positive Technologies (AI Summary)

CVSS v4.0

9.3

Critical

Base vector

AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H

Name of the Vulnerable Software and Affected Versions: Google Cloud Platform's guest-oslogin versions between 20190304 and 20200507

Description: A vulnerability in Google Cloud Platform's guest-oslogin allows a user with 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.

Recommendations: For versions between 20190304 and 20200507, if an update to a newer version is not possible, edit /etc/group/security.conf and remove the "docker" user from the OS Login entry to mitigate the issue. At the moment, there is no information about a newer version that contains a fix for this vulnerability, but it is known that all images created after 2020-May-07 are fixed.

Exploit

Fix

Incorrect Default Permissions

Weakness Enumeration

CWE-276

Related Identifiers

BDU:2020-04068

CVE-2020-8907

OPENSUSE-SU-2020:0996-1

OPENSUSE-SU-2020:1014-1

OPENSUSE-SU-2020_0996-1

OPENSUSE-SU-2020_1014-1

SUSE-SU-2020:1934-1

SUSE-SU-2020:2200-1

Affected Products

Suse

Guest-Oslogin

References · 26

• 🔥 https://gitlab.com/gitlab-com/gl-security/gl-redteam/red-team-tech-notes/-/tree/master/oslogin-privesc-june-2020 · Exploit
• https://github.com/GoogleCloudPlatform/guest-oslogin/pull/29 · Patch
• https://osv.dev/vulnerability/CVE-2020-8907 · Vendor Advisory
• http://lists.opensuse.org/opensuse-security-announce/2020-07/msg00037.html · Vendor Advisory
• https://bdu.fstec.ru/vul/2020-04068 · Security Note
• https://osv.dev/vulnerability/UBUNTU-CVE-2020-8907 · Vendor Advisory
• https://cloud.google.com/support/bulletins/#gcp-2020-008 · Vendor Advisory
• https://osv.dev/vulnerability/openSUSE-SU-2020:0996-1 · Vendor Advisory
• http://lists.opensuse.org/opensuse-security-announce/2020-07/msg00047.html · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2020-8907 · Security Note
• https://osv.dev/vulnerability/openSUSE-SU-2020:1014-1 · Vendor Advisory
• https://osv.dev/vulnerability/SUSE-SU-2020:2200-1 · Vendor Advisory
• https://osv.dev/vulnerability/SUSE-SU-2020:1934-1 · Vendor Advisory
• https://ubuntu.com/security/CVE-2020-8907 · Vendor Advisory
• https://cve.org/CVERecord?id=CVE-2020-8907 · Security Note