CVE-2023-5106
📋 TL;DR
This vulnerability in GitLab EE Ultimate allows attackers to impersonate users in CI/CD pipelines through direct transfer group imports. Attackers could execute unauthorized pipeline jobs with elevated privileges. Affects GitLab EE Ultimate installations running vulnerable versions.
💻 Affected Systems
- GitLab EE Ultimate
📦 What is this software?
Gitlab by Gitlab
GitLab is a complete DevOps platform providing source code management, CI/CD pipelines, security scanning, container registry, and collaboration tools used by millions of developers and thousands of enterprises worldwide. As both a cloud-hosted SaaS offering (GitLab.com) and self-managed software, G...
Learn more about Gitlab →Gitlab by Gitlab
GitLab is a complete DevOps platform providing source code management, CI/CD pipelines, security scanning, container registry, and collaboration tools used by millions of developers and thousands of enterprises worldwide. As both a cloud-hosted SaaS offering (GitLab.com) and self-managed software, G...
Learn more about Gitlab →Gitlab by Gitlab
GitLab is a complete DevOps platform providing source code management, CI/CD pipelines, security scanning, container registry, and collaboration tools used by millions of developers and thousands of enterprises worldwide. As both a cloud-hosted SaaS offering (GitLab.com) and self-managed software, G...
Learn more about Gitlab →⚠️ Risk & Real-World Impact
Worst Case
Attackers could execute arbitrary code in CI pipelines, access sensitive data, deploy malicious code to production, or compromise the entire GitLab instance through pipeline execution.
Likely Case
Unauthorized access to CI/CD pipelines allowing execution of malicious jobs, potential data exfiltration, and privilege escalation within the GitLab environment.
If Mitigated
Limited impact with proper access controls, but still potential for unauthorized pipeline execution if attackers gain initial access.
🎯 Exploit Status
Requires some level of access to perform group imports. Exploitation involves manipulating group import functionality.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 16.2.8, 16.3.5, 16.4.1
Vendor Advisory: https://gitlab.com/gitlab-org/security/gitlab/-/issues/980
Restart Required: Yes
Instructions:
1. Backup GitLab instance. 2. Update to patched version: 16.2.8, 16.3.5, or 16.4.1. 3. Restart GitLab services. 4. Verify update with version check.
🔧 Temporary Workarounds
Disable group imports
linuxTemporarily disable direct transfer group imports to prevent exploitation
gitlab-rails console
ApplicationSetting.first.update(group_import_enabled: false)
🧯 If You Can't Patch
- Implement strict access controls on group import functionality
- Monitor and audit all CI/CD pipeline executions for unauthorized activity
🔍 How to Verify
Check if Vulnerable:
Check GitLab version: if running 13.12-16.2.7, 16.3.0-16.3.4, or 16.4.0 with Ultimate license, you are vulnerable.Check Version:
sudo gitlab-rake gitlab:env:info | grep 'GitLab Version'Verify Fix Applied:
Verify version is 16.2.8, 16.3.5, or 16.4.1 or higher. Test group import functionality to ensure proper user validation.📡 Detection & Monitoring
Log Indicators:
- Unauthorized group import attempts
- CI pipeline executions from unexpected users
- Failed authentication attempts during group transfers
Network Indicators:
- Unusual API calls to group import endpoints
- Suspicious CI/CD job executions
SIEM Query:
source="gitlab" AND ("group_import" OR "direct_transfer") AND status="success"