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CVE-2025-57052: cJSON Out-of-bounds Access Vulnerability and Mitigation

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Overview

The CVE-2025-57052 vulnerability is an alarming security flaw found in cJSON versions 1.5.0 through 1.7.18. It primarily affects applications that heavily rely on cJSON for processing JSON data. This vulnerability has severe implications, including system compromise and potential data leakage. It’s crucial for cybersecurity professionals, system administrators, and developers to understand the nature of this vulnerability and how to protect systems against it.

Vulnerability Summary

CVE ID: CVE-2025-57052
Severity: Critical (9.8)
Attack Vector: Network
Privileges Required: None
User Interaction: None
Impact: System compromise and potential data leakage

Affected Products

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Product | Affected Versions

cJSON | 1.5.0 to 1.7.18

How the Exploit Works

The vulnerability exists in the `decode_array_index_from_pointer` function in cJSON_Utils.c. This function is responsible for decoding the index of an array from the pointer. However, malformed JSON pointer strings containing alphanumeric characters can cause out-of-bounds access. This means that an attacker can craft a malicious JSON pointer that accesses memory beyond the array’s limits, potentially reading sensitive data or causing a crash that could lead to additional exploits.

Conceptual Example Code

Here is a conceptual example of a malformed JSON pointer that might exploit this vulnerability:

POST /vulnerable/endpoint HTTP/1.1
Host: target.example.com
Content-Type: application/json
{ "json_pointer": "/malformed_array_index/" }

In this example, the `malformed_array_index` is a specially crafted alphanumeric string that triggers the out-of-bounds access vulnerability when processed by the vulnerable cJSON versions.

Recommended Mitigation

The most effective mitigation for this vulnerability is to apply the vendor’s patch to update cJSON to a version that fixes this flaw. If applying the vendor’s patch is not immediately feasible, a temporary mitigation could be to use a Web Application Firewall (WAF) or an Intrusion Detection System (IDS) to detect and block attempts to exploit this vulnerability. However, this should only be a temporary measure until the vendor’s patch can be applied.

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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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