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CVE-2025-40930: JSON::SIMD Buffer Overflow Vulnerability in Perl

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Overview

The vulnerability, CVE-2025-40930, is a significant security flaw affecting the JSON::SIMD Perl module, specifically versions before 1.07. This vulnerability has the potential to lead to system compromises, data leaks, and enable denial-of-service attacks. The severity of this vulnerability underlines its potential to disrupt system operations and compromise sensitive data.

Vulnerability Summary

CVE ID: CVE-2025-40930
Severity: High (7.5 CVSS score)
Attack Vector: Network
Privileges Required: None
User Interaction: None
Impact: Potential system compromise and data leakage

Affected Products

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Product | Affected Versions

JSON::SIMD for Perl | Before 1.07

How the Exploit Works

This vulnerability is a buffer overflow issue. It stems from an improper validation of user-supplied input when parsing JSON data. Attackers can craft malicious JSON data that triggers an integer overflow, causing a segmentation fault. This can lead to a denial-of-service condition or potentially allow arbitrary code execution.

Conceptual Example Code

The following is a conceptual example of how the vulnerability might be exploited. This could be a sample HTTP request, where the attacker sends a POST request with a malicious JSON payload:

POST /vulnerable/endpoint HTTP/1.1
Host: target.example.com
Content-Type: application/json
{ "malicious_payload": "{'$gt': ''}" }

In this example, the malicious payload triggers an integer overflow, causing a segmentation fault in the JSON::SIMD Perl module, and potentially leading to arbitrary code execution or denial-of-service.

Mitigation Guidance

Users are advised to apply the vendor patch to fix this vulnerability. In the absence of a patch, using a Web Application Firewall (WAF) or an Intrusion Detection System (IDS) may help to mitigate the risk temporarily.

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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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