CVE-2018-3726 in crud-file-server
Summary
by MITRE
crud-file-server node module before 0.8.0 suffers from a Cross-Site Scripting vulnerability to a lack of validation of file names.
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Analysis
by VulDB Data Team • 03/22/2023
The vulnerability identified as CVE-2018-3726 resides within the crud-file-server node module, specifically affecting versions prior to 0.8.0. This security flaw manifests as a cross-site scripting vulnerability that stems from inadequate validation of file names submitted to the server. The issue occurs when users upload files through the module's interface, where the application fails to properly sanitize or validate the file names before processing them. This weakness creates a potential attack vector where malicious actors can exploit the lack of input validation to inject malicious scripts into the server's file handling mechanisms.
The technical implementation of this vulnerability allows attackers to manipulate file names during upload operations, potentially leading to script execution in the context of the victim's browser. When the server processes these malformed file names, it fails to properly escape or validate the input, creating opportunities for XSS attacks. The vulnerability specifically targets the file name validation logic within the crud-file-server module, which is designed to handle file operations but lacks proper sanitization measures for user-supplied data. This flaw aligns with CWE-79, which defines cross-site scripting as a weakness where untrusted data is sent to a web browser without proper validation or encoding.
The operational impact of this vulnerability extends beyond simple script injection, as it can enable attackers to perform various malicious activities including session hijacking, data theft, and redirection to malicious sites. When exploited, the vulnerability allows adversaries to inject malicious JavaScript code that executes in the context of legitimate users who view the affected files or interact with the server's file listing functionality. This creates a persistent threat vector that can compromise user sessions and potentially lead to full system compromise if the server has elevated privileges or if users with administrative access interact with the vulnerable interface. The vulnerability is particularly concerning in environments where file sharing and management capabilities are exposed to untrusted users, as it directly undermines the security of file handling operations.
Organizations utilizing the crud-file-server module should immediately upgrade to version 0.8.0 or later to remediate this vulnerability, as the fix includes proper input validation and sanitization of file names. Additional mitigations include implementing proper content security policies, validating all file name inputs through regular expressions that exclude potentially malicious characters, and employing web application firewalls to detect and block suspicious file name patterns. The vulnerability demonstrates the critical importance of input validation in web applications and aligns with ATT&CK technique T1203, which involves exploiting vulnerabilities in web applications through injection attacks. Security teams should also conduct comprehensive testing to ensure that all file handling operations properly validate and sanitize user inputs, particularly in modules that process file names or other user-supplied data.