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CVE-2024-21604: Juniper Networks Junos OS Evolved Kernel Vulnerability Leading to Denial of Service

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Overview

The vulnerability CVE-2024-21604, identified in the kernel of Juniper Networks Junos OS Evolved, poses a significant threat to system security. It allows network-based attackers to create a Denial of Service (DoS), which could lead to system compromise or data leakage. This vulnerability is particularly concerning due to its broad reach, affecting a wide range of Juniper Networks Junos OS Evolved versions.

Vulnerability Summary

CVE ID: CVE-2024-21604
Severity: High (CVSS: 7.5)
Attack Vector: Network
Privileges Required: None
User Interaction: None
Impact: Potential system compromise or data leakage

Affected Products

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Product | Affected Versions

Juniper Networks Junos OS Evolved | All versions earlier than 20.4R3-S7-EVO
Juniper Networks Junos OS Evolved | 21.2R1-EVO and later
Juniper Networks Junos OS Evolved | 21.4-EVO versions earlier than 21.4R3-S5-EVO
Juniper Networks Junos OS Evolved | 22.1-EVO versions earlier than 22.1R3-S2-EVO
Juniper Networks Junos OS Evolved | 22.2-EVO versions earlier than 22.2R3-EVO
Juniper Networks Junos OS Evolved | 22.3-EVO versions earlier than 22.3R2-EVO
Juniper Networks Junos OS Evolved | 22.4-EVO versions earlier than 22.4R2-EVO

How the Exploit Works

The exploit takes advantage of a vulnerability in the kernel of Juniper Networks Junos OS Evolved, which fails to allocate resources without limits or throttling. An attacker can exploit this vulnerability by sending a high rate of specific valid packets to be processed by the routing engine. This overload of packets leads to a loss of connectivity of the routing engine with other system components, causing a complete and persistent system outage.

Conceptual Example Code

While the exact method to exploit this vulnerability may vary, a conceptual example might involve an attacker flooding the network with packets in a targeted attack. This could be done using a tool like hping3:

hping3 -i u1 -S -p 80 target_IP

In this example, `-i u1` sends one packet every microsecond, `-S` sets the SYN flag, `-p 80` targets port 80, and `target_IP` is the IP address of the targeted system. This is a simplified example and the actual exploit may involve more complex techniques or specific types of packets.

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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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