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CVE-2025-25251: Incorrect Authorization Vulnerability in FortiClient Mac Leads to Privilege Escalation

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Overview

The Common Vulnerabilities and Exposures (CVE) system has identified a critical security flaw designated as CVE-2025-25251. This vulnerability is found in specific versions of FortiClient for Mac, a popular endpoint protection solution. The flaw, categorized as an Incorrect Authorization vulnerability [CWE-863], could potentially allow an attacker with local access to the system to escalate their privileges by sending specially crafted XPC messages.
This is a significant concern, particularly for organizations using the affected versions of FortiClient Mac. The vulnerability could potentially lead to system compromise or data leakage, severely impacting the confidentiality, integrity, and availability of resources.

Vulnerability Summary

CVE ID: CVE-2025-25251
Severity: High (7.8 CVSS Score)
Attack Vector: Local
Privileges Required: None
User Interaction: None
Impact: System compromise, potential data leakage

Affected Products

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Product | Affected Versions

FortiClient Mac | 7.4.0 through 7.4.2
FortiClient Mac | 7.2.0 through 7.2.8
FortiClient Mac | 7.0.0 through 7.0.14

How the Exploit Works

The vulnerability exploits a flaw in the authorization controls of FortiClient. Specifically, an attacker can exploit this vulnerability by sending specially crafted XPC messages to the FortiClient application. XPC is a form of interprocess communication used in Mac OS applications. In this case, the attacker manipulates this communication to elevate their privileges on the system.

Conceptual Example Code

Below is a conceptual example of shell command that an attacker might use to exploit this vulnerability:

#!/bin/bash
# Craft malicious XPC message
malicious_xpc_message = "malicious_payload"
# Send the malicious XPC message to FortiClient
xpc_send "com.fortinet.FortiClient" $malicious_xpc_message

This script crafts a malicious XPC message and uses the `xpc_send` command to send the message to the FortiClient application. If successful, this could lead to privilege escalation on the system.
Please note that this is a conceptual example meant for educational purposes only. It is crucial to keep your systems updated with the latest security patches to prevent such potential attacks.
In the case of CVE-2025-25251, the mitigation guidance is to apply the vendor patch as soon as possible or use WAF/IDS for temporary mitigation until the 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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