CVE-2019-18792 : Vulnerability Insights and Analysis

A vulnerability has been detected in Suricata 5.0.0 that allows attackers to bypass TCP-based signatures by overlapping a TCP segment with a fabricated FIN packet. This issue affects both Linux and Windows clients.

Understanding CVE-2019-18792

What is CVE-2019-18792?

CVE-2019-18792 is a vulnerability in Suricata 5.0.0 that enables the circumvention of TCP-based signatures by injecting a fake FIN packet to evade detection.

The Impact of CVE-2019-18792

This vulnerability allows malicious actors to bypass security measures and potentially execute attacks without being detected by Suricata's TCP-based signatures.

Technical Details of CVE-2019-18792

Vulnerability Description

By overlapping a TCP segment with a fabricated FIN packet, attackers can avoid detection of TCP-based signatures in Suricata 5.0.0.

Affected Systems and Versions

Suricata 5.0.0

Exploitation Mechanism

Attackers insert a fake FIN packet just before the PUSH ACK packet to bypass detection.

Mitigation and Prevention

Immediate Steps to Take

Update Suricata to the latest version that includes a patch for CVE-2019-18792.
Monitor network traffic for any suspicious activities that may indicate exploitation of this vulnerability.

Long-Term Security Practices

Regularly update and patch all software and systems to prevent vulnerabilities.
Implement network segmentation and access controls to limit the impact of potential attacks.

Patching and Updates

Apply security updates and patches provided by Suricata to address CVE-2019-18792.