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CVE-2024-21907: Denial of Service Vulnerability in Newtonsoft.Json

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Overview

The vulnerability CVE-2024-21907 is a serious cybersecurity concern, impacting the Newtonsoft.Json library before version 13.0.1. This vulnerability arises from a mishandling of exceptional conditions, which can potentially lead to system compromise or data leakage. It is crucial for entities using the affected versions of Newtonsoft.Json to understand this vulnerability and take appropriate measures to mitigate its impact.

Vulnerability Summary

CVE ID: CVE-2024-21907
Severity: High – CVSS Score of 7.5
Attack Vector: Network
Privileges Required: None
User Interaction: None
Impact: Denial of service, potential system compromise, and data leakage

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Product | Affected Versions

Newtonsoft.Json | Before 13.0.1

How the Exploit Works

The exploit works by passing specially crafted data to the JsonConvert.DeserializeObject method within the Newtonsoft.Json library. This action may trigger a StackOverflow exception, leading to a denial of service. Under certain circumstances, an unauthenticated and remote attacker may be able to induce this denial of service condition, potentially compromising the system and leading to data leakage.

Conceptual Example Code

Consider the following conceptual example of how the vulnerability might be exploited. This is a sample HTTP POST request with a malicious JSON payload:

POST /vulnerable/endpoint HTTP/1.1
Host: target.example.com
Content-Type: application/json
{ "malicious_payload": "StackOverflow inducing data" }

In this example, the “malicious_payload” is crafted to induce a StackOverflow exception when parsed by the JsonConvert.DeserializeObject method in the vulnerable version of the Newtonsoft.Json library.

Recommended Mitigation

Users of affected versions of Newtonsoft.Json are advised to upgrade to version 13.0.1 or later. In situations where an immediate upgrade is not possible, the use of a Web Application Firewall (WAF) or Intrusion Detection System (IDS) can be employed as temporary mitigation.

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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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