CVE-2024-8114: GitLab Privilege Escalation Vulnerability

CVE-2024-8114 Overview

A privilege escalation vulnerability has been discovered in GitLab CE/EE affecting all versions from 8.12 before 17.4.5, 17.5 before 17.5.3, and 17.6 before 17.6.1. This vulnerability allows an attacker with access to a victim's Personal Access Token (PAT) to escalate privileges within the GitLab instance, potentially gaining unauthorized access to sensitive repositories, project configurations, and administrative functions.

Critical Impact

An attacker who obtains a victim's Personal Access Token can leverage this vulnerability to escalate their privileges beyond the intended scope of the token, potentially compromising the entire GitLab instance and all hosted repositories.

Affected Products

• GitLab Community Edition (CE) versions 8.12 to 17.4.4
• GitLab Enterprise Edition (EE) versions 8.12 to 17.4.4
• GitLab CE/EE versions 17.5.0 to 17.5.2
• GitLab CE/EE version 17.6.0

Discovery Timeline

• 2024-11-26 - CVE-2024-8114 published to NVD
• 2024-12-12 - Last updated in NVD database

Technical Details for CVE-2024-8114

Vulnerability Analysis

This vulnerability is classified as a Missing Authorization (CWE-862) issue within GitLab's Personal Access Token handling mechanism. The flaw exists in how GitLab processes and validates the scope and permissions associated with Personal Access Tokens, enabling attackers to bypass intended authorization controls.

When an attacker gains access to a victim's PAT—whether through credential theft, phishing, or other means—they can exploit the insufficient authorization checks to perform actions that should be restricted based on the token's defined scope. This represents a significant security concern for organizations using GitLab, as PATs are commonly used for CI/CD pipelines, API integrations, and automated workflows.

The network-based attack vector with low complexity requirements makes this vulnerability particularly concerning for internet-facing GitLab instances. The impact spans confidentiality, integrity, and availability, as elevated privileges could allow attackers to access sensitive source code, modify repository contents, or disrupt development workflows.

Root Cause

The root cause of CVE-2024-8114 lies in insufficient authorization validation within GitLab's access control framework. Specifically, the application fails to properly verify that actions performed using a Personal Access Token are within the authorized scope of that token. This missing authorization check (CWE-862) allows authenticated requests that should be denied based on token permissions to succeed, effectively granting the attacker elevated privileges.

Attack Vector

The attack requires the adversary to first obtain a valid Personal Access Token belonging to a GitLab user. This can be accomplished through various methods including phishing attacks, credential stuffing, or exploiting other vulnerabilities that leak token information. Once in possession of the PAT, the attacker can authenticate to the GitLab API and exploit the authorization bypass to perform privileged operations.

The exploitation follows this general pattern: the attacker uses the stolen PAT to authenticate API requests, then crafts specific requests that target functionality outside the token's intended scope. Due to the missing authorization checks, these requests are processed as if the attacker had full privileges of the token owner or beyond.

For detailed technical information about this vulnerability, refer to the GitLab Issue Discussion and the original HackerOne Report #2649822.

Detection Methods for CVE-2024-8114

Indicators of Compromise

• Unusual API activity originating from Personal Access Tokens, especially actions outside normal usage patterns
• Authentication events using PATs from unexpected IP addresses or geographic locations
• Privilege escalation attempts visible in GitLab audit logs showing unauthorized access to restricted resources
• API calls attempting to access administrative endpoints using non-admin tokens

Detection Strategies

• Enable and monitor GitLab audit logs for suspicious token usage and privilege-related events
• Implement alerting on API requests that result in authorization failures followed by successful access
• Deploy network monitoring to detect unusual patterns of GitLab API traffic
• Cross-reference PAT usage logs with user activity to identify potential token theft scenarios

Monitoring Recommendations

• Configure centralized log aggregation for all GitLab authentication and API access events
• Establish baseline behavior profiles for PAT usage and alert on deviations
• Implement real-time monitoring of privileged operations within GitLab
• Review and audit Personal Access Token permissions and expiration policies regularly

How to Mitigate CVE-2024-8114

Immediate Actions Required

• Upgrade GitLab CE/EE to version 17.4.5, 17.5.3, or 17.6.1 or later immediately
• Audit all existing Personal Access Tokens and revoke any that are unnecessary or have excessive scopes
• Rotate all PATs for privileged accounts as a precautionary measure
• Review GitLab audit logs for any suspicious activity indicating prior exploitation

Patch Information

GitLab has released security patches addressing this vulnerability. Organizations should upgrade to the following fixed versions:

• GitLab 17.4.5 - Patches the vulnerability for the 17.4.x branch
• GitLab 17.5.3 - Patches the vulnerability for the 17.5.x branch
• GitLab 17.6.1 - Patches the vulnerability for the 17.6.x branch

For detailed upgrade instructions and release notes, consult the GitLab Issue Discussion.

Workarounds

• Implement strict network access controls limiting GitLab API access to trusted IP ranges
• Enable two-factor authentication (2FA) for all GitLab users to reduce token theft risk
• Configure PAT expiration policies to limit the validity period of tokens
• Implement IP-based restrictions for API access where possible
• Monitor and limit the scopes granted to Personal Access Tokens to the minimum required

# Review and audit all Personal Access Tokens in GitLab Rails console
# Access the Rails console
gitlab-rails console

# List all active PATs with their scopes and users
PersonalAccessToken.active.each do |token|
  puts "User: #{token.user.username}, Token: #{token.name}, Scopes: #{token.scopes}, Expires: #{token.expires_at}"
end

# Revoke a specific token by name
PersonalAccessToken.find_by(name: 'suspicious_token')&.revoke!