CVE-2022-28005 in Phone System Management Console
Summary
by MITRE • 05/06/2022
An issue was discovered in the 3CX Phone System Management Console prior to version 18 Update 3 FINAL. An unauthenticated attacker could abuse improperly secured access to arbitrary files on the server, leading to cleartext credential disclosure. Afterwards, the authenticated attacker is able to upload a file that overwrites a 3CX service binary, leading to Remote Code Execution as NT AUTHORITY\SYSTEM on Windows installations. Versions prior to version 18, Hotfix 1 Build 18.0.3.461 March 2022, are prone to an additional unauthenticated file system access to C:\Windows\System32.
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Analysis
by VulDB Data Team • 05/16/2026
The vulnerability identified as CVE-2022-28005 represents a critical security flaw in the 3CX Phone System Management Console affecting versions prior to 18 Update 3 FINAL. This vulnerability demonstrates a severe misconfiguration in access controls that allows unauthenticated attackers to exploit improperly secured file access mechanisms within the system. The flaw manifests through multiple attack vectors that escalate from initial credential disclosure to full system compromise, making it particularly dangerous for organizations relying on this unified communications platform.
The technical implementation of this vulnerability stems from inadequate authentication mechanisms and improper file access controls within the 3CX Management Console. Attackers can leverage this weakness to access arbitrary files on the server without providing credentials, resulting in cleartext credential exposure that compromises the entire system. This initial access vector aligns with CWE-287, which addresses improper authentication issues, and represents a fundamental failure in the application's security architecture. The vulnerability specifically targets the file system access controls that should normally require proper authentication before allowing access to sensitive system files and directories.
The operational impact of CVE-2022-28005 extends far beyond simple credential theft, as it provides attackers with a complete path to remote code execution with system-level privileges. Once authenticated, attackers can upload malicious files that overwrite legitimate 3CX service binaries, enabling them to execute arbitrary code with NT AUTHORITY\SYSTEM privileges on Windows installations. This privilege escalation capability directly maps to ATT&CK technique T1059.001 for command and script interpreter, and T1543.003 for create or modify system process, representing a complete compromise of the target system. The ability to overwrite service binaries fundamentally undermines the integrity of the system and allows persistent backdoor access.
Additional vulnerability exposure exists in versions prior to the specified hotfix, where attackers can access C:\Windows\System32 directory without authentication, providing access to critical system files and binaries. This expands the attack surface significantly and allows for more sophisticated exploitation techniques including system file manipulation and rootkit deployment. The vulnerability affects organizations running 3CX Phone Systems across multiple deployment scenarios, from small businesses to enterprise environments, making it particularly concerning for widespread adoption. The timing of the vulnerability disclosure coincides with a period when many organizations were migrating to newer versions, creating a window of opportunity for attackers to exploit unpatched systems.
Organizations should implement immediate mitigations including applying the vendor-provided patches and updates to versions 18 Update 3 FINAL and later, implementing network segmentation to limit access to the 3CX Management Console, and conducting thorough security audits of exposed systems. The vulnerability demonstrates the critical importance of proper access control implementation and regular security assessments to prevent similar issues in unified communications platforms. Security monitoring should specifically focus on unusual file access patterns and unauthorized file uploads to detect exploitation attempts. This vulnerability serves as a reminder of the importance of secure configuration management and the need for comprehensive security testing of administrative interfaces in enterprise communication systems.