CVE-2022-29623 in Connect-Multiparty
Summary
by MITRE • 05/16/2022
An arbitrary file upload vulnerability in the file upload module of Connect-Multiparty v2.2.0 allows attackers to execute arbitrary code via a crafted PDF file.
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Analysis
by VulDB Data Team • 05/20/2025
The vulnerability identified as CVE-2022-29623 represents a critical arbitrary file upload flaw within the Connect-Multiparty v2.2.0 file upload module, which serves as a middleware component for handling multipart form data in node.js applications. This particular weakness stems from insufficient validation mechanisms that fail to properly sanitize file uploads, creating a pathway for malicious actors to bypass security controls and execute unauthorized code on affected systems. The vulnerability specifically manifests when the application processes PDF files, which are commonly trusted file types in web applications, making the attack vector particularly insidious and difficult to detect through traditional security measures.
The technical implementation of this vulnerability resides in the file upload validation logic where the system does not adequately verify file extensions, MIME types, or file content signatures before accepting and storing uploaded files. Attackers can craft malicious PDF files that contain embedded payloads or exploit the file upload mechanism to place executable code in the web root directory. The flaw operates at the application layer and can be exploited through a simple HTTP POST request containing a specially crafted file, making it accessible to attackers with minimal technical expertise. This vulnerability directly maps to CWE-434, which describes insecure file upload vulnerabilities where applications accept files without proper validation, and aligns with ATT&CK technique T1505.003 for server-side include injection, as the malicious files can be executed on the server.
The operational impact of CVE-2022-29623 extends beyond simple code execution, as successful exploitation can lead to complete system compromise, data exfiltration, and persistent backdoor access. Organizations utilizing Connect-Multiparty v2.2.0 in their web applications face significant risk, particularly those handling user-uploaded content or operating in environments where security controls are minimal. The vulnerability affects applications that rely on this specific middleware version, potentially impacting a wide range of web services including content management systems, file sharing platforms, and user profile management systems. Attackers can leverage this weakness to establish persistent access, escalate privileges, or use the compromised system as a launch point for further attacks within the network infrastructure.
Mitigation strategies for this vulnerability require immediate patching of the Connect-Multiparty middleware to a version that properly validates file uploads and implements robust sanitization measures. Organizations should implement multiple layers of defense including strict file type validation, content inspection, and proper file storage segregation. The recommended approach includes configuring applications to reject all file types except those explicitly permitted, implementing proper MIME type checking, and storing uploaded files outside the web root directory to prevent direct execution. Security controls should also include regular security assessments of file upload functionality, implementation of web application firewalls, and monitoring for suspicious file upload activities. Additionally, organizations should consider implementing file integrity checks and content signature verification to detect and prevent the upload of malicious files even when initial validation controls are bypassed. The vulnerability demonstrates the critical importance of proper input validation and secure coding practices in preventing remote code execution through file upload mechanisms, aligning with industry best practices outlined in the OWASP Top Ten and NIST cybersecurity frameworks.