CVE-2023-7224 in Connect
Summary
by MITRE • 01/08/2024
OpenVPN Connect version 3.0 through 3.4.6 on macOS allows local users to execute code in external third party libraries using the DYLD_INSERT_LIBRARIES environment variable
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Analysis
by VulDB Data Team • 09/05/2024
The vulnerability identified as CVE-2023-7224 affects OpenVPN Connect versions 3.0 through 3.4.6 on macOS operating systems, representing a critical security flaw that enables local privilege escalation through improper handling of dynamic library loading mechanisms. This issue stems from the application's failure to properly sanitize environment variables during execution, specifically the DYLD_INSERT_LIBRARIES parameter that macOS uses to inject additional libraries into running processes. The vulnerability falls under the category of improper input validation and insecure library loading practices, aligning with CWE-426 and CWE-74 as outlined in the Common Weakness Enumeration catalog. Attackers can exploit this weakness by manipulating the DYLD_INSERT_LIBRARIES environment variable to force the OpenVPN Connect application to load malicious third-party libraries that can execute arbitrary code with the privileges of the running process.
The technical implementation of this vulnerability involves the macOS dynamic linker mechanism that processes the DYLD_INSERT_LIBRARIES environment variable to inject libraries before the main application loads. When OpenVPN Connect executes with elevated privileges during network configuration or authentication processes, any malicious library injected through this mechanism can execute code within the context of the privileged process. This creates a significant attack surface since the OpenVPN application typically runs with administrator privileges to manage network interfaces and system-level configurations. The flaw essentially allows a local attacker to bypass normal security boundaries and execute malicious code with elevated privileges, potentially leading to complete system compromise. The vulnerability is particularly dangerous because it leverages the legitimate macOS dynamic linking infrastructure while exploiting the application's trust in environment variables without proper validation or sanitization.
The operational impact of CVE-2023-7224 extends beyond simple code execution, as it represents a pathway for attackers to establish persistent access and escalate privileges within macOS environments. This vulnerability can be exploited by adversaries who gain local access to a system, potentially through phishing attacks, social engineering, or other initial compromise techniques. Once exploited, the malicious code can perform actions such as creating backdoors, exfiltrating sensitive data, modifying system configurations, or establishing persistence mechanisms that survive system reboots. The attack vector is particularly concerning in enterprise environments where OpenVPN Connect is commonly deployed for remote access, as it could allow attackers to compromise multiple systems or escalate privileges to administrative levels. According to ATT&CK framework, this vulnerability maps to T1059.001 (Command and Scripting Interpreter: PowerShell) and T1548.002 (Abuse Elevation Control Mechanism: Bypass User Access Control) as attackers could leverage the elevated privileges to bypass security controls and maintain access.
Mitigation strategies for CVE-2023-7224 should focus on immediate application updates to versions that address the environment variable handling issue, as well as implementing system-level protections to restrict the DYLD_INSERT_LIBRARIES environment variable. Organizations should deploy the latest OpenVPN Connect versions that have patched this vulnerability, typically versions 3.4.7 and later, which properly validate and sanitize environment variables before process execution. System administrators should also consider implementing additional controls such as restricting the ability of untrusted users to modify environment variables, monitoring for suspicious library loading patterns, and implementing application whitelisting policies that prevent unauthorized code execution. The vulnerability demonstrates the importance of secure coding practices and environment variable sanitization, particularly when dealing with applications that operate with elevated privileges. Network security teams should monitor for exploitation attempts through unusual network activity patterns or unauthorized access attempts that might indicate successful exploitation of this vulnerability. Additionally, implementing security awareness training for users can help prevent initial compromise through social engineering attacks that might lead to exploitation of this vulnerability.