CVE-2024-27733 in Smart S42 Management Platform
Summary
by MITRE • 03/07/2024
File Upload vulnerability in Byzro Network Smart s42 Management Platform v.S42 allows a local attacker to execute arbitrary code via the useratte/userattestation.php component.
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Analysis
by VulDB Data Team • 04/15/2026
The Byzro Network Smart s42 Management Platform version S42 contains a critical file upload vulnerability that presents a significant security risk to organizations relying on this network management solution. This vulnerability exists within the useratte/userattestation.php component, which handles user attestation processes and file handling operations. The flaw allows a local attacker with access to the system to upload malicious files that can subsequently be executed with elevated privileges, potentially leading to complete system compromise.
This vulnerability represents a classic insecure file upload flaw that aligns with CWE-434, which describes the improper restriction of uploads of executable files. The issue stems from inadequate validation and sanitization of file uploads within the userattestation.php script, where the platform fails to properly verify file types, contents, or execution permissions before processing uploaded files. The local attacker exploitation vector indicates that the vulnerability does not require network exposure, making it particularly dangerous as it can be leveraged by adversaries who have already gained access to the system through other means such as legitimate administrative credentials or compromised user accounts.
The operational impact of this vulnerability extends beyond simple code execution, as it provides a potential foothold for persistent access and lateral movement within network environments. Attackers could upload backdoor scripts, malware, or other malicious payloads that would execute with the privileges of the web application user, potentially enabling privilege escalation and system-wide compromise. The vulnerability's presence in a management platform specifically designed for network security monitoring and control creates a particularly dangerous scenario where attackers could manipulate network configurations, disable security features, or establish persistent access points that would remain undetected for extended periods.
Organizations utilizing the Byzro Network Smart s42 Management Platform should immediately implement mitigations including restricting file upload capabilities to authenticated users with proper authorization levels, implementing strict file type validation, and deploying additional monitoring controls around the affected useratte/userattestation.php component. The ATT&CK framework's technique T1197 - Dynamic Resolution and T1059 - Command and Scripting Interpreter should be considered when developing defensive strategies, as these techniques often involve the execution of malicious code through file upload mechanisms. Additionally, network segmentation and privilege separation measures should be enforced to limit the potential impact of successful exploitation, while regular security audits and penetration testing should be conducted to identify similar vulnerabilities in other components of the platform.
The vulnerability demonstrates the critical importance of secure coding practices and proper input validation in web applications, particularly those handling user-provided data. The lack of proper file validation in the userattestation.php script represents a fundamental security flaw that violates several security best practices and standards including those outlined in the OWASP Top Ten and NIST cybersecurity frameworks. Organizations should also consider implementing web application firewalls and runtime application self-protection mechanisms to detect and prevent exploitation attempts, while maintaining up-to-date security patches and monitoring for indicators of compromise that may indicate successful exploitation of this vulnerability.