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CVE-2025-59148: Segmentation Fault Vulnerability in Suricata Network Engine

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Overview

CVE-2025-59148 is a significant vulnerability detected in the Suricata engine, a widely deployed network Intrusion Detection System (IDS), Intrusion Prevention System (IPS), and Network Security Monitoring (NSM) tool. This vulnerability can cause a segmentation fault in Suricata versions 8.0.0 and below, leading to potential system compromises or data leakage, especially in environments where Suricata is a critical part of the security infrastructure.

Vulnerability Summary

CVE ID: CVE-2025-59148
Severity: High, CVSS Score 7.5
Attack Vector: Network
Privileges Required: None
User Interaction: Not required
Impact: Potential system compromise and data leakage

Affected Products

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Product | Affected Versions

Suricata | 8.0.0 and below

How the Exploit Works

The vulnerability exists due to incorrect handling of the “entropy” keyword when it is not anchored to a “sticky” buffer in Suricata. This incorrect handling can lead to a segmentation fault, causing the Suricata process to crash. An attacker can exploit this vulnerability by sending specially crafted network packets that trigger the incorrect behavior, leading to potential system compromise or data leakage.

Conceptual Example Code

Below is a conceptual example of a network packet that could potentially exploit this vulnerability. This is not a working exploit, but an example to illustrate the nature of the vulnerability:

POST /suricata/entropy HTTP/1.1
Host: target.example.com
Content-Type: application/x-www-form-urlencoded
entropy=malicious_unanchored_value

Mitigation Guidance

Users are advised to update to Suricata version 8.0.1 or later, which contains a patch for this issue. If updating is not immediately possible, users can disable rules using the entropy keyword, or validate that they are anchored to a sticky buffer as a temporary workaround. Additionally, deploying a Web Application Firewall (WAF) or Intrusion Detection System (IDS) can provide temporary mitigation.

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Disclaimer:

The information and code presented in this article are provided for educational and defensive cybersecurity purposes only. Any conceptual or pseudocode examples are simplified representations intended to raise awareness and promote secure development and system configuration practices.

Do not use this information to attempt unauthorized access or exploit vulnerabilities on systems that you do not own or have explicit permission to test.

Ameeba and its authors do not endorse or condone malicious behavior and are not responsible for misuse of the content. Always follow ethical hacking guidelines, responsible disclosure practices, and local laws.

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