CVE-2018-15472
📋 TL;DR
This vulnerability in GitLab allows attackers to cause denial of service by exploiting a timeout issue in the diff formatter using rouge in Sidekiq jobs. Affected systems include GitLab Community and Enterprise Edition before specific versions, potentially impacting all users of vulnerable instances.
💻 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
Complete service disruption through resource exhaustion, making GitLab unavailable for all users.
Likely Case
Degraded performance and intermittent service interruptions affecting user productivity.
If Mitigated
Minimal impact with proper monitoring and resource limits in place.
🎯 Exploit Status
Exploitation requires ability to trigger diff processing, typically through repository operations.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 11.1.7, 11.2.4, or 11.3.1
Vendor Advisory: https://about.gitlab.com/releases/2018/10/01/security-release-gitlab-11-dot-3-dot-1-released/
Restart Required: Yes
Instructions:
1. Backup your GitLab instance. 2. Update to GitLab 11.1.7, 11.2.4, or 11.3.1 or later. 3. Restart GitLab services. 4. Verify the update was successful.
🔧 Temporary Workarounds
Configure Sidekiq timeouts
allSet explicit timeouts for Sidekiq jobs to limit potential blocking
Edit GitLab configuration to add: Sidekiq::Limiter.timeout = 30
Rate limit repository operations
allImplement rate limiting on repository operations that trigger diff processing
Configure rate limiting in GitLab's application settings
🧯 If You Can't Patch
- Implement strict network segmentation and firewall rules to limit access to GitLab
- Deploy monitoring and alerting for Sidekiq job execution times and resource usage
🔍 How to Verify
Check if Vulnerable:
Check GitLab version via admin interface or command: sudo gitlab-rake gitlab:env:infoCheck Version:
sudo gitlab-rake gitlab:env:info | grep 'GitLab version'Verify Fix Applied:
Confirm version is 11.1.7, 11.2.4, 11.3.1 or later and monitor Sidekiq job performance📡 Detection & Monitoring
Log Indicators:
- Long-running Sidekiq jobs in production.log
- Timeout errors in sidekiq.log
- High CPU/memory usage alerts
Network Indicators:
- Increased response times for GitLab operations
- Timeout errors from GitLab API
SIEM Query:
source="gitlab.log" AND ("Sidekiq" AND "timeout" OR "blocked" AND "diff")