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.
