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CVE-2025-53603: Null Pointer Dereference Vulnerability in Alinto SOPE SOGo

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Overview

The vulnerability CVE-2025-53603 affects the Alinto SOPE SOGo version 2.0.2 through 5.12.2. This vulnerability is a result of a NULL pointer dereference, which can cause an unexpected application crash. Attackers can exploit this vulnerability to compromise the system or potentially leak sensitive data.

Vulnerability Summary

CVE ID: CVE-2025-53603
Severity: High (7.5 CVSS Score)
Attack Vector: Network
Privileges Required: None
User Interaction: None
Impact: System compromise or potential data leakage

Affected Products

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Product | Affected Versions

Alinto SOPE SOGo | 2.0.2 through 5.12.2

How the Exploit Works

The vulnerability stems from the application’s mishandling of duplicate parameters in POST requests and the query string. When the application encounters a duplicate parameter, it causes a NULL pointer dereference, leading to a crash. An attacker can exploit this by sending a specially crafted request that includes a duplicate parameter in the query string and the POST body.

Conceptual Example Code

While the exact details of the exploit are proprietary, here’s an illustrative example of how a rogue HTTP request might be constructed:

POST /vulnerable/endpoint HTTP/1.1
Host: target.example.com
Content-Type: application/x-www-form-urlencoded
parameter1=value1&parameter2=value2&parameter1=value1

In this example, `parameter1` is a duplicate in the POST body, and if included in the query string, it could trigger the vulnerability.

Mitigation Guidance

Users are strongly recommended to apply the latest vendor patches to their Alinto SOPE SOGo application. As a temporary mitigation, a Web Application Firewall (WAF) or Intrusion Detection System (IDS) can help detect and block exploit attempts. However, these measures are not a substitute for patching the vulnerability at the application level.

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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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