CVE-2025-3846: Markparticle Webserver SQL Injection Flaw

CVE-2025-3846 Overview

A SQL injection vulnerability has been identified in markparticle WebServer up to version 1.0. This vulnerability exists in the Registration component, specifically within the file code/http/httprequest.cpp. The flaw allows attackers to manipulate the username and password arguments to inject malicious SQL commands. This vulnerability can be exploited remotely, and exploit details have been publicly disclosed.

Critical Impact

Remote attackers can exploit this SQL injection vulnerability to bypass authentication, extract sensitive data from the database, modify or delete records, and potentially gain unauthorized access to the underlying system.

Affected Products

• markparticle WebServer version 1.0 and earlier
• Systems running markparticle WebServer with the vulnerable Registration component
• Applications utilizing code/http/httprequest.cpp for user authentication

Discovery Timeline

• 2025-04-21 - CVE-2025-3846 published to NVD
• 2025-10-15 - Last updated in NVD database

Technical Details for CVE-2025-3846

Vulnerability Analysis

This SQL injection vulnerability affects the Registration functionality in markparticle WebServer. The vulnerable code resides in code/http/httprequest.cpp, where user-supplied input for the username and password fields is not properly sanitized before being incorporated into SQL queries. This allows an attacker to craft malicious input that alters the intended SQL query structure, enabling unauthorized database operations.

The vulnerability is classified under CWE-89 (SQL Injection) and CWE-74 (Improper Neutralization of Special Elements in Output Used by a Downstream Component). SQL injection attacks of this nature can lead to authentication bypass, data exfiltration, data manipulation, and in some cases, command execution on the underlying database server.

Root Cause

The root cause of this vulnerability is improper input validation and sanitization in the HTTP request handling code. The username and password parameters are directly concatenated into SQL query strings without proper parameterization or escaping of special characters. This classic SQL injection pattern allows attackers to break out of the intended query context and inject arbitrary SQL commands.

Attack Vector

The attack can be launched remotely over the network without requiring authentication. An attacker can send specially crafted HTTP requests to the Registration endpoint containing SQL injection payloads in the username or password fields. The vulnerable application processes these inputs without sanitization, executing the attacker's SQL commands against the backend database.

The exploitation technique involves injecting SQL metacharacters and commands through the login or registration forms. For detailed technical analysis of the exploitation method, refer to the Notion SQL Injection Report and Notion SQL Injection Analysis for specific payload examples and exploitation scenarios.

Detection Methods for CVE-2025-3846

Indicators of Compromise

• Unusual database queries containing SQL metacharacters in authentication logs
• Failed login attempts with payloads containing single quotes, double dashes, or UNION statements
• Database errors appearing in application logs indicating SQL syntax errors
• Unexpected data access patterns or bulk data extraction from user tables

Detection Strategies

• Implement Web Application Firewall (WAF) rules to detect and block common SQL injection patterns in form submissions
• Monitor HTTP request logs for suspicious characters in username and password fields such as single quotes ('), semicolons (;), and comment sequences (--)
• Deploy database activity monitoring to identify anomalous query patterns targeting user authentication tables
• Configure intrusion detection systems (IDS) to alert on SQL injection attack signatures targeting the Registration endpoint

Monitoring Recommendations

• Enable detailed logging for the code/http/httprequest.cpp component and authentication-related database queries
• Set up alerts for repeated authentication failures with varying payloads from the same source IP
• Monitor database server logs for queries containing unexpected SQL syntax or unauthorized data access attempts
• Implement rate limiting on registration and login endpoints to slow automated exploitation attempts

How to Mitigate CVE-2025-3846

Immediate Actions Required

• Upgrade markparticle WebServer to a patched version when available from the vendor
• Implement input validation to reject malicious characters in the username and password fields
• Deploy a Web Application Firewall (WAF) with SQL injection protection rules in front of the affected application
• Consider temporarily disabling the Registration functionality if not critical to operations

Patch Information

At the time of publication, no official patch information has been released by markparticle. Organizations should monitor the VulDB entry and the vendor's official channels for security updates. Until a patch is available, implement the recommended workarounds and defense-in-depth measures.

Workarounds

• Implement parameterized queries or prepared statements in the code/http/httprequest.cpp file to prevent SQL injection
• Add server-side input validation to sanitize and escape all user input before database operations
• Deploy network-level controls such as IP allowlisting to restrict access to the Registration endpoint
• Use database accounts with minimal required privileges to limit the impact of successful exploitation

# Example WAF rule to block common SQL injection patterns
# ModSecurity rule for Apache/Nginx
SecRule ARGS:username|ARGS:password "@rx (?i)(\b(union|select|insert|update|delete|drop|truncate)\b|--|;|')" \
    "id:100001,phase:2,deny,status:403,msg:'SQL Injection attempt detected in authentication fields'"