How to Run OpenSCAP for Security Compliance Scanning

OpenSCAP is an open-source tool that helps automate compliance auditing and vulnerability scanning of Linux systems using the Security Content Automation Protocol (SCAP). Running OpenSCAP allows you to assess your system’s security posture against established policies and benchmarks, such as those from the Center for Internet Security (CIS) or Security Technical Implementation Guides (STIGs). This guide walks you through how to install, run, and interpret OpenSCAP scans effectively.

What You’ll Need

• A Linux system (typically RHEL, CentOS, Fedora, Ubuntu, or Debian)
• Root or sudo privileges to install and run OpenSCAP
• Network access to download SCAP content and updates (optional but recommended)
• Basic familiarity with the command line and package management

Step-by-Step

1. Install OpenSCAP tools: Use your Linux distribution’s package manager. For example, on RHEL/CentOS/Fedora, run sudo yum install openscap-scanner scap-security-guide. On Ubuntu/Debian, use sudo apt-get install libopenscap8 openscap-utils and download SCAP content separately.
2. Download or identify SCAP content: OpenSCAP requires SCAP content files (usually XML) that define the compliance rules. These are often provided by your OS vendor or can be downloaded from projects like ComplianceAsCode/content or the OpenSCAP security policies page. For example, the Security Technical Implementation Guide (STIG) or CIS Benchmark for your OS.
3. Run a basic scan: Use the oscap command-line tool. A typical command to scan your local system against a SCAP policy is:

   sudo oscap oval eval --results results.xml --report report.html /usr/share/xml/scap/ssg/content/ssg-centos7-ds.xml

   Replace the content file path with the SCAP content relevant to your OS.

4. Review scan output: The command produces an XML results file and an HTML report. Open the HTML report in a web browser to see detailed compliance results, including passed, failed, and not applicable checks.
5. Interpret and remediate findings: Based on the report, identify which security controls failed. Each failed item usually includes remediation instructions or references to fix the issue.
6. Automate scans and reporting: For ongoing compliance, schedule OpenSCAP scans via cron or integrate with configuration management tools like Ansible. Export reports regularly for audits.
7. Customize SCAP content (optional): Advanced users can tailor SCAP content profiles to match organizational policies by editing the XML or using tools like the SCAP Security Guide project.

Common Mistakes

• Using the wrong SCAP content file: Different OS versions require matching SCAP content; using incompatible content leads to inaccurate results or errors.
• Running scans without root privileges: Many checks require elevated permissions to assess system settings accurately.
• Ignoring scan warnings and errors: Some results may be warnings or informational; treating all findings as failures can cause confusion.
• Not regularly updating SCAP content: Security policies evolve; outdated content can miss new vulnerabilities or obsolete checks.
• Overlooking remediation instructions: Scan reports usually include how to fix issues; ignoring this prolongs vulnerabilities.

Tips

• Start with a known baseline: Use vendor-provided or well-maintained SCAP content for your OS to ensure reliable results.
• Use the oscap tool’s xccdf commands: For profile-based scans, oscap xccdf eval offers more flexibility than just OVAL evaluation.
• Combine OpenSCAP with automation: Integrate with tools like Ansible or Jenkins for continuous compliance checks.
• Leverage community resources: Explore the ComplianceAsCode project for updated content and best practices.
• Validate your environment before scanning: Ensure all dependencies and system services are running to avoid false negatives.

Troubleshooting

Scan fails to run or errors out: Check that OpenSCAP and SCAP content packages are installed correctly. Verify you have root privileges. Run oscap --version to confirm installation.

SCAP content file not found or invalid: Confirm the path to the content file is correct. Download the latest SCAP security guide for your OS version if needed.

Incomplete or empty scan reports: Make sure the scan command includes both --results and --report flags and points to valid content. Check system logs for permission issues.

False positives or negatives in scan results: Some controls might not apply to your environment. Adjust the profile or customize the SCAP content to exclude irrelevant checks.

Scan runs but report is difficult to interpret: Use the HTML report rather than raw XML. Consider tools like the OpenSCAP Workbench for GUI-based scanning and report viewing.

Frequently Asked Questions

What is the difference between OVAL and XCCDF in OpenSCAP?

OVAL defines low-level system checks, while XCCDF structures policies and profiles. OpenSCAP uses both to evaluate compliance.

Can I run OpenSCAP on non-Linux systems?

OpenSCAP primarily supports Linux; limited support exists for some Unix variants, but functionality varies.

How often should I run OpenSCAP scans?

Regular scans are recommended—weekly or monthly depending on your security requirements—to maintain compliance.

Is OpenSCAP suitable for large enterprise environments?

Yes, OpenSCAP scales well, especially when integrated with configuration management and reporting tools.

Where can I find updated SCAP content?

Official sources include your Linux vendor’s security guide packages and the ComplianceAsCode GitHub repository.

Can OpenSCAP fix vulnerabilities automatically?

OpenSCAP itself audits and reports issues; remediation must be done manually or via automation tools using the provided guidance.

By following this guide, you can confidently run OpenSCAP to audit your systems for security compliance, understand the results, and take action to improve your security posture. Regular scanning and staying updated with SCAP content ensure ongoing protection against evolving threats.

For example, running the command sudo oscap xccdf eval --profile xccdf_org.ssgproject.content_profile_standard --results results.xml --report report.html /usr/share/xml/scap/ssg/content/ssg-centos7-ds.xml will evaluate your CentOS 7 system against the standard security profile, producing both machine-readable and human-readable output to guide remediation.

Remember that OpenSCAP is a powerful but technical tool; investing time to understand its terminology and output will maximize its benefits for your security program.

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