CVE-2023-6033
📋 TL;DR
This cross-site scripting (XSS) vulnerability in GitLab's Jira integration configuration allows attackers to inject malicious JavaScript that executes in victims' browsers. All GitLab CE/EE instances with Jira integration configured are affected if running vulnerable versions. Attackers can potentially steal session cookies, perform actions as the victim, or redirect users to malicious sites.
💻 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
Attacker steals administrator session cookies, gains full control of GitLab instance, accesses source code, modifies repositories, and potentially pivots to internal systems.
Likely Case
Attacker steals user session cookies, accesses private repositories, modifies code, or performs phishing attacks against other users.
If Mitigated
With proper CSP headers and session management, impact limited to temporary session hijacking or minor UI manipulation.
🎯 Exploit Status
Exploitation requires attacker to have access to modify Jira integration settings or trick authenticated user into visiting malicious page. No public exploit code available yet.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 16.6.1, 16.5.3, 16.4.3
Vendor Advisory: https://about.gitlab.com/releases/2023/11/30/critical-security-release-gitlab-16-6-1-released/
Restart Required: Yes
Instructions:
1. Backup GitLab instance. 2. Update to patched version using package manager (apt/yum). 3. Run 'gitlab-ctl reconfigure'. 4. Restart GitLab services with 'gitlab-ctl restart'.
🔧 Temporary Workarounds
Disable Jira Integration
linuxTemporarily disable Jira integration to prevent exploitation while planning upgrade.
gitlab-rails runner "ApplicationSetting.current.update(jira_integration_enabled: false)"
Restrict Jira Configuration Access
allLimit which users can modify Jira integration settings to trusted administrators only.
🧯 If You Can't Patch
- Implement Content Security Policy (CSP) headers to restrict script execution
- Enable HTTP-only and secure flags on session cookies to limit cookie theft impact
🔍 How to Verify
Check if Vulnerable:
Check GitLab version and Jira integration status: 'cat /opt/gitlab/version-manifest.txt | grep gitlab' and verify Jira is configured in Admin Area > Settings > Integrations.Check Version:
gitlab-rake gitlab:env:info | grep VersionVerify Fix Applied:
Confirm version is 16.6.1, 16.5.3, or 16.4.3: 'gitlab-rake gitlab:env:info | grep Version'📡 Detection & Monitoring
Log Indicators:
- Unusual Jira configuration changes in production.log
- Multiple failed authentication attempts followed by Jira setting modifications
Network Indicators:
- Unexpected outbound connections to attacker-controlled domains after Jira configuration access
SIEM Query:
source="gitlab" AND ("Jira" AND "configuration" AND "update") AND NOT user="admin_username"