CVE-2022-48482 in Phone System
Summary
by MITRE • 05/02/2023
3CX before 18 Update 2 Security Hotfix build 18.0.2.315 on Windows allows unauthenticated remote attackers to read certain files via /Electron/download directory traversal. Files may have credentials, full backups, call recordings, and chat logs.
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Analysis
by VulDB Data Team • 01/30/2025
The vulnerability identified as CVE-2022-48482 affects 3CX Phone System versions prior to 18 Update 2 Security Hotfix build 18.0.2.315 on Windows platforms. This directory traversal flaw exists within the Electron download functionality of the application's web interface, specifically within the /Electron/download endpoint. The vulnerability represents a critical security weakness that allows unauthenticated remote attackers to access sensitive files stored on the server without requiring any valid credentials or authentication tokens. This issue falls under the category of improper access control and directory traversal attacks, which are commonly classified as CWE-22 and CWE-23 respectively within the Common Weakness Enumeration framework. The affected system components include the web server interface that handles file downloads for the Electron-based client application.
The technical exploitation of this vulnerability occurs through crafted HTTP requests that manipulate the directory traversal paths within the /Electron/download endpoint. Attackers can construct malicious URLs that bypass normal file access restrictions and traverse the filesystem to access files stored in directories that should normally be protected. The vulnerability specifically targets the Electron download functionality, which is typically used for distributing client applications and related files. However, due to insufficient input validation and path sanitization, attackers can navigate beyond the intended download directory to access system files and sensitive data stored in other locations. This flaw demonstrates a classic lack of proper input validation and access control mechanisms that should be implemented at the application level.
The operational impact of this vulnerability is severe and far-reaching given the types of sensitive information that can be accessed through this attack vector. Attackers who successfully exploit this vulnerability can obtain complete database backups that contain all user accounts, phone numbers, extension details, and system configurations. Additionally, the vulnerability allows access to call recordings which may contain confidential business communications, personal conversations, and sensitive data exchanges. Chat logs provide further insight into internal communications and may contain proprietary information, strategic discussions, or personal details. Credential files that could include database passwords, API keys, or authentication tokens may also be accessible, potentially enabling further compromise of the system or lateral movement within the network. This vulnerability essentially provides an attacker with a comprehensive view of the organization's communication infrastructure and sensitive data assets, making it particularly dangerous for enterprise environments.
Organizations affected by CVE-2022-48482 should implement immediate mitigations including applying the 3CX 18 Update 2 Security Hotfix build 18.0.2.315 which contains the necessary patches to address the directory traversal vulnerability. Network-level protections should be implemented through firewall rules that restrict access to the affected endpoint and limit exposure to trusted networks only. The principle of least privilege should be enforced by ensuring that only authorized personnel have access to the system administration interfaces and sensitive file locations. Regular security audits should be conducted to identify and remediate similar vulnerabilities in other components of the communication infrastructure. System monitoring should be enhanced to detect unusual access patterns or attempts to access sensitive files through the web interface. Additionally, organizations should review their backup and file access policies to ensure that sensitive data is properly secured and that access controls are appropriately configured. This vulnerability aligns with ATT&CK technique T1071.004 for application layer protocol and T1566 for credential access, demonstrating how directory traversal attacks can lead to broader compromise of organizational security postures.