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CVE-2025-49507: Critical Deserialization of Untrusted Data Vulnerability in LoftOcean’s CozyStay

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Overview

The primary focus of this article is the critical vulnerability identified as CVE-2025-49507, which affects LoftOcean’s CozyStay. This vulnerability is caused by the deserialization of untrusted data which allows for an object injection. It’s a severe issue because it opens the door for potential system compromise and data leakage. Any organisation that uses CozyStay versions before 1.7.1 are vulnerable to this exploit and should take immediate action to prevent possible breaches.

Vulnerability Summary

CVE ID: CVE-2025-49507
Severity: Critical (9.8 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

LoftOcean CozyStay | Before 1.7.1

How the Exploit Works

The vulnerability is due to insufficient sanitization of user-supplied data before deserialization. An attacker can exploit this by sending a specially crafted object which, when deserialized, can execute arbitrary code or modify the application’s behavior. This can lead to a complete compromise of the system.

Conceptual Example Code

The following is a conceptual example of how the vulnerability might be exploited. An attacker could send a malicious payload via a POST request to a vulnerable endpoint:

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

This `serialized_object` would be carefully crafted to cause the application to behave in a way beneficial to the attacker when it is deserialized – for example, by executing arbitrary code, bypassing authentication checks, or leaking sensitive data.

Mitigation and Prevention

The immediate mitigation for this vulnerability is to apply the vendor patch. LoftOcean has already released version 1.7.1 of CozyStay that addresses this vulnerability. If unable to apply the patch immediately, using a Web Application Firewall (WAF) or Intrusion Detection System (IDS) can serve as a temporary mitigation. However, these are not long-term solutions and can only reduce the risk of exploitation. It is strongly recommended to apply the vendor patch as soon as possible to effectively eliminate the vulnerability.

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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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