CVE-2020-8907 Detail

Current 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.


View Analysis Description

Severity



CVSS 3.x Severity and Metrics:

NIST CVSS score matches with CNA score
CNA:  Google Inc.
Base Score:  7.8 HIGH
Vector:  CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H


NVD Analysts use publicly available information to associate vector strings and CVSS scores. We also display any CVSS information provided within the CVE List from the CNA.

Note: The NVD and the CNA have provided the same score. When this occurs only the CNA information is displayed, but the Acceptance Level icon for the CNA is given a checkmark to signify NVD concurrence.

References to Advisories, Solutions, and Tools

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Hyperlink Resource
https://cloud.google.com/support/bulletins/#gcp-2020-008 Vendor Advisory 
https://github.com/GoogleCloudPlatform/guest-oslogin/pull/29 Patch  Third Party Advisory 
https://gitlab.com/gitlab-com/gl-security/gl-redteam/red-team-tech-notes/-/tree/master/oslogin-privesc-june-2020 Exploit  Third Party Advisory 

Weakness Enumeration

CWE-ID CWE Name Source
CWE-276 Incorrect Default Permissions cwe source acceptance level NIST   Reference acceptance level Google Inc.  

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Change History

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Quick Info

CVE Dictionary Entry:
CVE-2020-8907
NVD Published Date:
06/22/2020
NVD Last Modified:
07/01/2020
Source:
MITRE