CVE-2023-2825
📋 TL;DR
CVE-2023-2825 is a critical path traversal vulnerability in GitLab CE/EE version 16.0.0 that allows unauthenticated attackers to read arbitrary files on the server. This affects GitLab instances with public projects containing attachments nested within at least five groups. The vulnerability enables unauthorized access to sensitive server files.
💻 Affected Systems
- GitLab Community Edition
- GitLab Enterprise Edition
📦 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 →⚠️ Risk & Real-World Impact
Worst Case
Complete server compromise through reading sensitive configuration files, SSH keys, database credentials, or other critical system files leading to data breach and system takeover.
Likely Case
Exfiltration of sensitive configuration data, source code, credentials, or other files from the GitLab server, potentially enabling further attacks.
If Mitigated
Limited impact if proper network segmentation and access controls prevent external access to vulnerable instances.
🎯 Exploit Status
Exploitation is straightforward with publicly available proof-of-concept code. No authentication required.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 16.0.1 and later versions
Vendor Advisory: https://gitlab.com/gitlab-org/cves/-/blob/master/2023/CVE-2023-2825.json
Restart Required: Yes
Instructions:
1. Backup your GitLab instance. 2. Update GitLab to version 16.0.1 or later using your package manager. 3. Restart GitLab services. 4. Verify the update was successful.
🔧 Temporary Workarounds
Disable public project attachments
allRemove attachments from public projects or make affected projects private to prevent exploitation.
Network access restriction
linuxRestrict network access to GitLab instance using firewall rules to limit exposure.
iptables -A INPUT -p tcp --dport 80,443 -s trusted_network -j ACCEPT
iptables -A INPUT -p tcp --dport 80,443 -j DROP
🧯 If You Can't Patch
- Immediately make all public projects with attachments private or remove attachments
- Implement strict network segmentation and firewall rules to limit access to GitLab instance
🔍 How to Verify
Check if Vulnerable:
Check GitLab version: if running 16.0.0 and has public projects with attachments nested 5+ groups, it's vulnerable.Check Version:
sudo gitlab-rake gitlab:env:info | grep 'GitLab version'Verify Fix Applied:
Verify GitLab version is 16.0.1 or later and test that path traversal attempts no longer succeed.📡 Detection & Monitoring
Log Indicators:
- Unusual file access patterns in GitLab logs
- Multiple failed path traversal attempts
- Access to attachment endpoints with unusual parameters
Network Indicators:
- Unusual HTTP requests to attachment endpoints with path traversal patterns
- External IPs accessing sensitive file paths
SIEM Query:
source="gitlab.log" AND ("path traversal" OR "../" OR "..\" OR "attachment" AND "public")🔗 References
- https://gitlab.com/gitlab-org/cves/-/blob/master/2023/CVE-2023-2825.json
- https://gitlab.com/gitlab-org/gitlab/-/issues/412371
- https://hackerone.com/reports/1994725
- https://gitlab.com/gitlab-org/cves/-/blob/master/2023/CVE-2023-2825.json
- https://gitlab.com/gitlab-org/gitlab/-/issues/412371
- https://hackerone.com/reports/1994725
