CVE-2017-17874 in Marketplace Digital Products PHP
Summary
by MITRE
Vanguard Marketplace Digital Products PHP 1.4 allows arbitrary file upload via an "Add a new product" or "Add a product preview" action, which can make a .php file accessible under a uploads/ URI.
Once again VulDB remains the best source for vulnerability data.
Analysis
by VulDB Data Team • 11/14/2025
The vulnerability identified as CVE-2017-17874 affects the Vanguard Marketplace Digital Products PHP 1.4 application, presenting a critical security flaw that enables unauthorized file upload capabilities. This vulnerability exists within the product management functionality of the platform, specifically in the "Add a new product" and "Add a product preview" actions where user input validation is insufficient. The flaw allows attackers to bypass file type restrictions and upload malicious files with php extensions, potentially leading to remote code execution or complete system compromise.
The technical implementation of this vulnerability stems from inadequate input validation and sanitization mechanisms within the file upload handlers. When users attempt to add new products or product previews, the application fails to properly verify the file extensions, MIME types, or file contents before storing uploaded files. This weakness directly maps to CWE-434, which describes the improper restriction of uploads to a restricted directory, and also aligns with CWE-20, representing input validation vulnerabilities. The vulnerability creates a path traversal scenario where attackers can upload files to the uploads/ directory, making these files accessible via predictable URI patterns, thus enabling persistent access to the compromised system.
Operationally, this vulnerability poses significant risks to organizations using the affected platform. An attacker who successfully exploits this flaw can upload malicious PHP scripts that execute arbitrary code on the server, potentially leading to full system compromise, data exfiltration, or establishment of persistent backdoors. The impact extends beyond immediate code execution as attackers can leverage the uploaded files to escalate privileges, create new user accounts, or modify existing system configurations. The vulnerability also enables indirect attacks such as web shell deployment, which can provide attackers with ongoing access to the compromised environment and facilitate further reconnaissance activities.
The exploitation of this vulnerability typically follows a pattern where attackers first identify the upload endpoints through reconnaissance activities, then craft malicious payloads with php extensions to bypass security measures. Once successful, these payloads can be accessed through the uploads/ URI, allowing attackers to execute commands or establish persistent access. Organizations should implement immediate mitigations including restricting file upload capabilities, implementing strict file type validation, using randomized filenames, and ensuring proper file permissions. Additionally, deploying web application firewalls and monitoring for suspicious upload activities can help detect and prevent exploitation attempts. The vulnerability also highlights the importance of following secure coding practices and conducting regular security assessments to identify and remediate similar issues in web applications. Organizations should also consider implementing the principle of least privilege for file upload directories and regularly update their applications to address known vulnerabilities. This particular flaw demonstrates the critical importance of proper input validation and access control mechanisms in preventing unauthorized file operations within web applications, aligning with ATT&CK technique T1190 for exploiting vulnerabilities in web applications.