CVE-2022-3761 in Connect
Summary
by MITRE • 10/25/2023
OpenVPN Connect versions before 3.4.0.4506 (macOS) and OpenVPN Connect before 3.4.0.3100 (Windows) allows man-in-the-middle attackers to intercept configuration profile download requests which contains the users credentials
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Analysis
by VulDB Data Team • 11/04/2023
This vulnerability exists in OpenVPN Connect client software versions prior to specific patches for both macOS and Windows platforms. The flaw represents a critical security weakness that enables man-in-the-middle attacks during the initial configuration profile download process. Attackers positioned between the client and the OpenVPN server can intercept and potentially modify the communication stream containing sensitive user credentials. This vulnerability specifically targets the authentication mechanism used during the profile acquisition phase, where users typically provide their login credentials to establish secure connections. The issue affects versions before 3.4.0.4506 for macOS and 3.4.0.3100 for Windows, indicating that these particular builds lacked proper cryptographic protections during profile transmission.
The technical implementation of this vulnerability stems from insufficient transport layer security measures during the configuration profile download process. When users attempt to establish connections through OpenVPN Connect, the client software requests configuration profiles from the server without adequate verification of the server's identity or encryption of the communication channel. This allows attackers to perform session hijacking or traffic interception attacks that can capture the credentials transmitted during this critical phase. The flaw essentially undermines the fundamental security assumptions of the OpenVPN protocol stack, as it creates an attack vector that bypasses normal authentication mechanisms and directly targets the credential delivery process.
The operational impact of this vulnerability is severe for organizations relying on OpenVPN Connect for secure remote access. Compromised credentials can lead to unauthorized access to corporate networks, data breaches, and potential lateral movement within target environments. Attackers can leverage this vulnerability to gain persistent access to sensitive systems, particularly in scenarios where users connect from untrusted networks such as public Wi-Fi hotspots or home networks. The vulnerability affects the entire user authentication lifecycle, potentially exposing not just the initial connection but also any subsequent access that relies on the compromised credentials. Organizations with remote work policies are particularly vulnerable, as the attack surface expands significantly when users connect from diverse and potentially insecure network locations.
Mitigation strategies should focus on immediate software updates to the patched versions of OpenVPN Connect for both operating systems. System administrators must ensure all client installations are upgraded to versions 3.4.0.4506 or later for macOS and 3.4.0.3100 or later for Windows. Network administrators should implement additional monitoring for unusual traffic patterns or connection attempts that might indicate exploitation attempts. The vulnerability aligns with CWE-319, which addresses the exposure of sensitive information through improper use of cryptographic protocols, and maps to ATT&CK technique T1071.004 for application layer protocol: DNS, where attackers might exploit the insecure profile download process to establish unauthorized connections. Organizations should also consider implementing network segmentation, mandatory access controls, and multi-factor authentication to reduce the impact of potential credential compromise. Regular security audits of remote access configurations and user authentication processes are essential to identify and remediate similar vulnerabilities across the infrastructure.