Technical Deep Dive Why Maintain Both Normal and V2 IPS Signatures in Check Point?

[WiliRGasparetto]

Check Point’s Intrusion Prevention System (IPS) is a core component of Threat Prevention, providing proactive protection against a wide range of network threats. Over time, the IPS engine and its signature formats have evolved, leading to the coexistence of "normal" and "version 2 (Ver 2)" signatures. This post explains the technical reasons for maintaining both, their architectural differences, and best practices for deployment.

IPS Architecture Overview

Check Point IPS uses a multi-layered detection engine:

• Passive Streaming Library (PSL): Reconstructs network streams for inspection.
• Protocol Parsers: Identify and separate protocols (HTTP, FTP, DNS, etc.) for context-aware analysis.
• Context Management Infrastructure (CMI): Determines which protections (signatures) apply to each protocol context.
• Pattern Matcher: The detection engine that uses signatures to identify malicious patterns.

IPS Inspection Flow Diagram

Traffic is processed through multiple analysis stages, with signatures applied at different protocol layers.

Normal vs. V2 Signatures: Technical Comparison

Feature	Normal Signature	V2 Signature (INSPECTv2)
Detection Engine	Classic Pattern Matcher	INSPECTv2 (advanced engine)
Coverage	Known threats	New threats, evasive techniques, improved accuracy
Performance	Lower resource usage	May require more CPU/memory, but optimized for accuracy
Compatibility	Legacy gateways	Modern gateways (R80+)
Update Frequency	Less frequent	Updated regularly

• Normal Signatures: Use traditional pattern matching, suitable for legacy environments and lower resource consumption.

• V2 Signatures: Leverage the advanced INSPECTv2 engine, supporting complex logic, context awareness, and better detection of modern threats.

Why Maintain Both Signature Types?

• Backward Compatibility: Some older gateways may not support V2 signatures. Keeping both ensures all devices remain protected.
• Redundancy: If a V2 signature causes issues (e.g., false positives), the normal signature can provide fallback protection.
• Gradual Migration: Allows administrators to test V2 signatures in "Detect" mode before fully switching from normal signatures.
• Maximum Coverage: Certain threats may only be detected by one signature type, so using both maximizes security.

Performance Considerations

• V2 signatures can be more resource-intensive due to deeper inspection and advanced logic.
• IPS Tuning: Administrators can enable/disable specific signatures or use different profiles for perimeter vs. internal gateways.
• Bypass Under Load: IPS can be configured to bypass traffic during high load to prevent bottlenecks, but this should be used cautiously.

Best Practices for Managing Signature Versions

1. Test in Staging: Always test new V2 signatures in a non-production environment.
2. Monitor Updates: Review IPS update notes and apply urgent protections as needed.
3. Separate Profiles: Use different IPS profiles for different gateway roles (e.g., perimeter vs. datacenter).
4. Monitor Logs: Watch for false positives/negatives and adjust protections accordingly.
5. Gradual Rollout: Deploy V2 signatures in "Detect" mode before moving to "Prevent."

Summary

• Normal signatures ensure compatibility and stability.
• V2 signatures provide enhanced detection and future-proofing.
• Maintaining both allows for a safe, flexible, and comprehensive security posture during transitions and upgrades.

References

• ATRG: IPS (sk95193)
• Threat Prevention Administration Guide (R81+)

[PhoneBoy]

To my knowledge, there is no way to see what a given IPS signature matches.

[WiliRGasparetto]

Hi @AlbertoThree , sorry for the delay in responding, but I found a website where we can verify the signatures and what they protect. Here are the links.

https://advisories.checkpoint.com/advisories/

https://threatwiki.checkpoint.com/threatwiki/public.htm

[AlbertoThree]

Thanks for the info!

[WiliRGasparetto]

You're welcome, we're here to help each other. Actually, I wrote another article on how to do this research; here's the link.

https://community.checkpoint.com/t5/Firewall-and-Security-Management/CVE-Signature-Evidence-the-shor...

[WiliRGasparetto]

I think this is totally on topic, @AlbertoThree , as @Timothy_Hall  said, you need a screenshot of the video to see more details. You can add them here, like in the screenshot.

[AlbertoThree]

Thanks @WiliRGasparetto and @WiliRGasparetto for your answers!
As soon as I am back in the office I will take a look at IPS explorer as well as review the settings.

[WiliRGasparetto]

You're welcome, count on us anytime for this and other matters.

[WiliRGasparetto]

I wrote another article related to EPS troubleshooting; it's worth reading at the link.

https://community.checkpoint.com/t5/Firewall-and-Security-Management/IPS-How-to-Filter-Events-by-CVE...

[WiliRGasparetto]

Hi everyone, I found where to search for subscriptions and wrote an article about it.

https://community.checkpoint.com/t5/Firewall-and-Security-Management/CVE-Signature-Evidence-the-shor...