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CVE-2024-21606: Double Free Vulnerability in Juniper Networks Junos OS Leading to Denial of Service

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Overview

The vulnerability identified as CVE-2024-21606 is a critical issue that affects Juniper Networks Junos OS on SRX Series. This vulnerability, due to a Double Free issue, potentially allows an unauthenticated attacker to cause a Denial of Service (DoS) attack, posing a serious threat to businesses and organizations that rely on these systems for their operations.

Vulnerability Summary

CVE ID: CVE-2024-21606
Severity: High (7.5)
Attack Vector: Network
Privileges Required: None
User Interaction: None
Impact: Potential system compromise or data leakage, leading to Denial of Service

Affected Products

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Product | Affected Versions

Junos OS on SRX Series | All versions earlier than 20.4R3-S8
Junos OS on SRX Series | 21.2 versions earlier than 21.2R3-S6
Junos OS on SRX Series | 21.3 versions earlier than 21.3R3-S5
Junos OS on SRX Series | 21.4 versions earlier than 21.4R3-S5
Junos OS on SRX Series | 22.1 versions earlier than 22.1R3-S3
Junos OS on SRX Series | 22.2 versions earlier than 22.2R3-S3
Junos OS on SRX Series | 22.3 versions earlier than 22.3R3-S1
Junos OS on SRX Series | 22.4 versions earlier than 22.4R2-S2, 22.4R3

How the Exploit Works

The exploit works by taking advantage of a Double Free vulnerability in the flow processing daemon (flowd) of Juniper Networks Junos OS on SRX Series. In a remote access VPN scenario, if a “tcp-encap-profile” is configured and a sequence of specific packets is received, a flowd crash and restart will be observed, leading to a Denial of Service.

Conceptual Example Code

While the exact details of the exploit are not provided, a conceptual example might involve sending a specific sequence of packets to a vulnerable endpoint. It might look something like this:

import socket
def send_malicious_packets(target_ip, target_port):
# Establish a connection
s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
s.connect((target_ip, target_port))
# Send a sequence of specific packets
for packet in malicious_packet_sequence:
s.send(packet)
# Close the connection
s.close()
# Replace with the target IP and port
send_malicious_packets('192.0.2.0', 1234)

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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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