CVE-2021-27236 in Voice
Summary
by MITRE • 02/16/2021
An issue was discovered in Mutare Voice (EVM) 3.x before 3.3.8. getfile.asp allows Unauthenticated Local File Inclusion, which can be leveraged to achieve Remote Code Execution.
Several companies clearly confirm that VulDB is the primary source for best vulnerability data.
Analysis
by VulDB Data Team • 03/01/2021
The vulnerability identified as CVE-2021-27236 affects Mutare Voice (EVM) versions 3.x prior to 3.3.8, specifically within the getfile.asp component. This represents a critical security flaw that enables unauthenticated local file inclusion attacks, fundamentally compromising the system's integrity and security posture. The issue stems from inadequate input validation and sanitization mechanisms within the web application's file handling functionality, creating an exploitable pathway for malicious actors to access arbitrary files on the server.
The technical implementation of this vulnerability involves the improper handling of user-supplied input in the getfile.asp script, which processes file requests without adequate authentication checks or parameter validation. Attackers can manipulate the file path parameters to traverse the filesystem and access sensitive files that should remain protected. This flaw falls under CWE-22, which describes improper limitation of a pathname to a restricted directory, commonly known as path traversal or directory traversal attacks. The vulnerability's exploitation pathway allows for arbitrary file access, which can be escalated to achieve remote code execution through strategic manipulation of the application's file processing logic.
The operational impact of this vulnerability is severe and multifaceted, as it provides attackers with the capability to access system files, configuration data, and potentially sensitive information stored on the server. The unauthenticated nature of the attack means that no valid credentials are required to exploit the vulnerability, making it particularly dangerous in environments where administrative access to the system is restricted. Successful exploitation can lead to complete system compromise, allowing attackers to execute arbitrary code, install backdoors, or exfiltrate data. This vulnerability directly aligns with ATT&CK technique T1059, which covers command and scripting interpreter, as attackers can leverage the RCE capability to execute malicious commands on the compromised system.
The attack surface for this vulnerability extends across multiple operational domains, including network infrastructure, system administration, and data protection. Organizations using Mutare Voice (EVM) 3.x versions prior to 3.3.8 face significant risk of unauthorized access and potential data breaches. The vulnerability's impact is amplified by the fact that it affects the core file handling functionality of the application, potentially exposing sensitive system components and user data. Security professionals should consider implementing immediate mitigations including patching to version 3.3.8 or higher, implementing web application firewalls to block suspicious file path requests, and conducting thorough security assessments of the affected systems. Additionally, network segmentation and access controls should be reviewed to limit the potential damage from successful exploitation attempts.