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CVE-2024-21611: Juniper Networks Junos OS and Junos OS Evolved Memory Leak Vulnerability

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Overview

This report provides a detailed analysis of the vulnerability identified as CVE-2024-21611. This vulnerability affects the Routing Protocol Daemon (rpd) of Juniper Networks Junos OS and Junos OS Evolved, potentially leading to a Denial of Service (DoS) situation. Understanding the nature of this vulnerability and the impacted products is critical for organizations utilizing these systems to ensure effective risk management and mitigation.

Vulnerability Summary

CVE ID: CVE-2024-21611
Severity: High (7.5 CVSS Score)
Attack Vector: Network
Privileges Required: None
User Interaction: None
Impact: A successful exploit can cause a slow memory leak, leading to a system crash and potentially system compromise or data leakage.

Affected Products

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Product | Affected Versions

Junos OS | 21.4 versions earlier than 21.4R3, 22.1 versions earlier than 22.1R3, 22.2 versions earlier than 22.2R3
Junos OS Evolved | 21.4-EVO versions earlier than 21.4R3-EVO, 22.1-EVO versions earlier than 22.1R3-EVO, 22.2-EVO versions earlier than 22.2R3-EVO

How the Exploit Works

The vulnerability resides in the Routing Protocol Daemon (rpd) of Juniper Networks Junos OS and Junos OS Evolved. In a Juniper Flow Monitoring (jflow) scenario, route churn causing Border Gateway Protocol (BGP) next hops to be updated will trigger a slow memory leak. Over time, this memory leak can lead to a system crash and restart of rpd, creating a Denial of Service scenario and potentially leading to system compromise or data leakage.

Conceptual Example Code

The following is a conceptual representation of how the vulnerability might be exploited:

user@host> cause_route_churn --bgp-next-hop --trigger-memory-leak

Please note that the above is not a real command but a high-level representation of how an attacker might exploit the vulnerability.

Mitigation Guidance

To mitigate this vulnerability, it is recommended to apply the vendor patch as soon as it becomes available. In the meanwhile, using a Web Application Firewall (WAF) or Intrusion Detection System (IDS) can serve as temporary mitigation, by monitoring and blocking suspicious network activity.

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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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