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CVE-2025-29915: Suricata Network Security Monitoring Engine Vulnerability

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Overview

The network Intrusion Detection System (IDS), Intrusion Prevention System (IPS), and Network Security Monitoring engine, Suricata, is susceptible to a significant vulnerability, CVE-2025-29915. This vulnerability, if exploited, could potentially lead to a system compromise or data leakage. The compromise arises due to the default packet size in Suricata, which is based on the network interface MTU, causing truncated packets to be seen by Suricata.

Vulnerability Summary

CVE ID: CVE-2025-29915
Severity: High, CVSS score of 7.5
Attack Vector: Network
Privileges Required: None
User Interaction: None
Impact: Potential system compromise and data leakage

Affected Products

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Product | Affected Versions

Suricata Network Security Monitoring Engine | Versions prior to 7.0.9

How the Exploit Works

The exploit takes advantage of the AF_PACKET defrag option in Suricata, which is enabled by default. This option allows AF_PACKET to re-assemble fragmented packets before reaching Suricata. However, because the default packet size in Suricata is based on the network interface MTU, Suricata can end up seeing truncated packets. If an attacker sends a maliciously fragmented packet, it can achieve a successful exploit.

Conceptual Example Code

Below is a conceptual example of how the vulnerability might be exploited. This is a simple script that sends fragmented packets to a target:

import socket
target_ip = "target.example.com"
packet = b"malicious_payload"
sock = socket.socket(socket.AF_INET, socket.SOCK_RAW, socket.IPPROTO_RAW)
sock.sendto(packet, (target_ip, 0))

This script sends a raw packet to a target IP. The payload is intentionally fragmented, which could lead to the exploitation of the Suricata vulnerability.

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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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