CVE-2019-18625 : What You Need to Know

A vulnerability was found in Suricata 5.0.0 that allowed for the circumvention of any tcp-based signature by simulating a closed TCP session using a malicious server. This issue affected both Linux and Windows clients.

Understanding CVE-2019-18625

This CVE entry describes a vulnerability in Suricata 5.0.0 that could be exploited to bypass tcp-based signatures.

What is CVE-2019-18625?

CVE-2019-18625 is a security vulnerability in Suricata 5.0.0 that enables attackers to evade tcp-based signatures by manipulating TCP session packets.

The Impact of CVE-2019-18625

The vulnerability allowed malicious actors to bypass security measures by injecting incorrect TCP Timestamp options, leading to the client disregarding critical packets.

Technical Details of CVE-2019-18625

This section provides in-depth technical insights into the CVE-2019-18625 vulnerability.

Vulnerability Description

The vulnerability in Suricata 5.0.0 allowed attackers to introduce incorrect TCP Timestamp options, causing the client to ignore essential packets like RST ACK and FIN ACK.

Affected Systems and Versions

Product: Suricata 5.0.0
Vendor: N/A
Affected Versions: N/A

Exploitation Mechanism

Attackers could exploit this vulnerability by simulating a closed TCP session using a malicious server and injecting incorrect TCP Timestamp options.

Mitigation and Prevention

Protecting systems from CVE-2019-18625 requires immediate actions and long-term security practices.

Immediate Steps to Take

Update Suricata to the latest version to patch the vulnerability.
Monitor network traffic for any suspicious activity.

Long-Term Security Practices

Regularly update and patch all software and security tools.
Implement network segmentation to limit the impact of potential breaches.

Patching and Updates

Ensure that all security patches and updates for Suricata are promptly applied to prevent exploitation of this vulnerability.