CVE-2020-8907 : Vulnerability Insights and Analysis

A vulnerability in Google Cloud Platform's guest-oslogin allows users to escalate privileges to root, posing a high security risk.

Understanding CVE-2020-8907

This CVE involves a privilege escalation issue in Google Cloud Platform's guest-oslogin, potentially leading to unauthorized access.

What is CVE-2020-8907?

The vulnerability in guest-oslogin versions between 20190304 and 20200507 enables users with limited roles to gain root privileges through Docker group membership.

The Impact of CVE-2020-8907

The vulnerability has a high severity level, with a CVSS base score of 7.8. It allows attackers to modify the host OS filesystem and gain administrative privileges.

Technical Details of CVE-2020-8907

This section provides detailed technical information about the vulnerability.

Vulnerability Description

The flaw in guest-oslogin versions allows users with the "roles/compute.osLogin" role to escalate privileges to root by leveraging Docker group membership.

Affected Systems and Versions

Product: guest-oslogin
Vendor: Google LLC
Versions affected: 20190304 to 20200507

Exploitation Mechanism

Attack Complexity: Low
Attack Vector: Local
Privileges Required: Low
Scope: Unchanged
User Interaction: None
Confidentiality, Integrity, and Availability Impact: High

Mitigation and Prevention

Protect your systems from CVE-2020-8907 with these mitigation strategies.

Immediate Steps to Take

Update to fixed images created after 2020-May-07
If unable to update, remove the "docker" user from the OS Login entry in /etc/group/security.conf

Long-Term Security Practices

Regularly review and update access roles and permissions
Monitor Docker group memberships and restrict unnecessary privileges

Patching and Updates

Apply patches and updates promptly to address security vulnerabilities