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CVE-2024-21614: Unusual Condition Check Vulnerability Leading to Denial of Service in Juniper Networks Junos OS and Junos OS Evolved

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Overview

This report discusses a significant vulnerability, CVE-2024-21614, that affects the Routing Protocol Daemon (RPD) of Juniper Networks’ Junos OS and Junos OS Evolved. The vulnerability allows network-based, unauthenticated attackers to cause service disruptions through continual execution of a specific query. This vulnerability is of significant concern due to the potential for system compromise or data leakage.

Vulnerability Summary

CVE ID: CVE-2024-21614
Severity: High (7.5 CVSS Score)
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 | 22.2 versions earlier than 22.2R2-S2, 22.2R3; 22.3 versions earlier than 22.3R2, 22.3R3
Juniper Networks Junos OS Evolved | 22.2 versions earlier than 22.2R2-S2-EVO, 22.2R3-EVO; 22.3 versions earlier than 22.3R2-EVO, 22.3R3-EVO

How the Exploit Works

The exploit functions by taking advantage of an improper check for unusual or exceptional conditions in the Routing Protocol Daemon (RPD) of Juniper Networks Junos OS and Junos OS Evolved. When NETCONF and gRPC are enabled, and a specific query is executed via Dynamic Rendering (DREND), rpd crashes and restarts. This crash process can be repeated to create a sustained Denial of Service (DoS) condition.

Conceptual Example Code

A malicious attacker may exploit this vulnerability by sending this
conceptual
HTTP POST request:

POST /drend/query HTTP/1.1
Host: target.juniper.net
Content-Type: application/netconf
{ "query": "specific_query_causing_crash" }

This example demonstrates the execution of a specific query via Dynamic Rendering (DREND) that causes rpd to crash and restart, leading to a Denial of Service (DoS) condition.

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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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