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CVE-2024-21616: Improper Validation of Syntactic Correctness of Input Leads to Denial of Service in Juniper Networks Junos OS

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Overview

The CVE-2024-21616 vulnerability affects the Juniper Networks Junos OS, specifically impacting the Packet Forwarding Engine (PFE). If exploited, this vulnerability can allow an unauthenticated, network-based attacker to cause a Denial of Service (DoS). This vulnerability is of particular concern due to its potential for system compromise or data leakage.

Vulnerability Summary

CVE ID: CVE-2024-21616
Severity: High (7.5 CVSS)
Attack Vector: Network
Privileges Required: None
User Interaction: None
Impact: Denial of Service, potential system compromise or data leakage

Affected Products

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Product | Affected Versions

Juniper Networks Junos OS | All versions earlier than 21.2R3-S6
Juniper Networks Junos OS | 21.3 versions earlier than 21.3R3-S5
Juniper Networks Junos OS | 21.4 versions earlier than 21.4R3-S5
Juniper Networks Junos OS | 22.1 versions earlier than 22.1R3-S4

How the Exploit Works

The exploit takes advantage of an Improper Validation of Syntactic Correctness of Input vulnerability in the Packet Forwarding Engine of Juniper Networks Junos OS. When a specific SIP packet is received and processed with SIP ALG enabled, NAT IP allocation fails for genuine traffic, causing a Denial of Service. Continuous receipt of this specific SIP ALG packet results in a sustained DoS condition.

Conceptual Example Code

The following is a
conceptual
example of how the vulnerability might be exploited. In this case, the attacker sends specific SIP ALG packets to the target system:

POST /sip/alg HTTP/1.1
Host: target.juniper.net
Content-Type: application/sdp
INVITE sip:user@target.juniper.net SIP/2.0
[vulnerability-specific SIP/ALG packet data]

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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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