CVE-2024-4835
📋 TL;DR
This is a cross-site scripting (XSS) vulnerability in GitLab that allows attackers to create malicious web pages that can steal sensitive user information like session cookies or authentication tokens. It affects GitLab instances running vulnerable versions, potentially exposing user data to unauthorized access.
💻 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 →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 →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 steal administrator session cookies, gain full administrative access to the GitLab instance, and potentially compromise the entire codebase and user accounts.
Likely Case
Attackers could steal regular user session cookies, access private repositories, and exfiltrate sensitive code or user data.
If Mitigated
With proper content security policies and input validation, the impact would be limited to minor data leakage from users who interact with the malicious page.
🎯 Exploit Status
Exploitation requires user interaction with a malicious page, but the XSS payload itself is straightforward to craft.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 16.10.6, 16.11.3, or 17.0.1
Vendor Advisory: https://gitlab.com/gitlab-org/gitlab/-/issues/461328
Restart Required: Yes
Instructions:
1. Backup your GitLab instance. 2. Update to GitLab 16.10.6, 16.11.3, or 17.0.1 using your package manager. 3. Restart GitLab services. 4. Verify the update was successful.
🔧 Temporary Workarounds
Content Security Policy (CSP)
allImplement a strict CSP to prevent execution of unauthorized scripts
Add CSP headers to your web server configuration or GitLab settings
Input Sanitization
allEnable additional input validation and sanitization in GitLab
Configure GitLab to sanitize user inputs more aggressively
🧯 If You Can't Patch
- Implement strict Content Security Policy headers
- Monitor for suspicious user activity and XSS attempts in logs
🔍 How to Verify
Check if Vulnerable:
Check your GitLab version against affected ranges: 15.11-16.10.5, 16.11-16.11.2, or 17.0Check Version:
sudo gitlab-rake gitlab:env:info | grep 'Version:'Verify Fix Applied:
Verify GitLab version is 16.10.6, 16.11.3, or 17.0.1 or higher📡 Detection & Monitoring
Log Indicators:
- Unusual JavaScript execution in user-generated content
- Suspicious URL parameters containing script tags
Network Indicators:
- Outbound connections to unknown domains from GitLab sessions
- Data exfiltration patterns
SIEM Query:
source="gitlab" AND (message="*script*" OR message="*javascript*" OR message="*onclick*")