CVE-2025-6871 Overview
A critical SQL injection vulnerability has been identified in SourceCodester Simple Company Website version 1.0. The vulnerability exists in the /classes/Login.php file, where improper handling of the Username argument allows attackers to inject malicious SQL code. This flaw can be exploited remotely without authentication, potentially compromising the underlying database and sensitive user information.
Critical Impact
This SQL injection vulnerability allows remote attackers to manipulate database queries through the Username parameter, potentially leading to unauthorized data access, data modification, or complete database compromise.
Affected Products
- SourceCodester Simple Company Website 1.0
- oretnom23 simple_company_website
Discovery Timeline
- June 29, 2025 - CVE-2025-6871 published to NVD
- July 01, 2025 - Last updated in NVD database
Technical Details for CVE-2025-6871
Vulnerability Analysis
This vulnerability is classified as CWE-74 (Improper Neutralization of Special Elements in Output Used by a Downstream Component), commonly manifesting as injection attacks. The vulnerable endpoint in /classes/Login.php fails to properly sanitize user-supplied input in the Username field before incorporating it into SQL queries. This allows attackers to craft malicious input that alters the intended SQL query logic, bypassing authentication mechanisms or extracting sensitive data from the database.
The attack can be initiated remotely over the network without requiring any authentication or user interaction. The vulnerability has been publicly disclosed, with proof-of-concept information available through external resources, increasing the risk of exploitation in the wild.
Root Cause
The root cause of this vulnerability lies in insufficient input validation and sanitization of the Username parameter within the Login.php authentication handler. The application directly concatenates or interpolates user input into SQL queries without using parameterized queries or prepared statements, creating an injection point that attackers can exploit.
Attack Vector
The attack vector is network-based, allowing remote exploitation. An attacker can submit specially crafted SQL syntax within the Username field of the login form. When the application processes this input, the malicious SQL commands are executed against the backend database. This can result in authentication bypass, data exfiltration, data manipulation, or in severe cases, complete database server compromise.
The exploitation technique typically involves submitting payloads such as boolean-based blind injection, time-based blind injection, or UNION-based injection through the login form's username field to manipulate the authentication query or extract database contents.
Detection Methods for CVE-2025-6871
Indicators of Compromise
- Unusual SQL error messages in application logs originating from /classes/Login.php
- Multiple failed login attempts with suspicious characters in username fields (single quotes, SQL keywords like UNION, SELECT, OR, AND)
- Unexpected database query patterns or slow query logs showing injection attempts
- Authentication bypass events where users gain access without valid credentials
Detection Strategies
- Implement web application firewall (WAF) rules to detect and block common SQL injection patterns in POST parameters
- Monitor application logs for SQL syntax errors and unusual database query failures
- Deploy intrusion detection systems (IDS) with signatures for SQL injection attack patterns
- Enable database auditing to track unauthorized or anomalous queries against user tables
Monitoring Recommendations
- Configure real-time alerting for repeated SQL errors in the authentication module
- Establish baseline metrics for login attempt patterns and alert on anomalies
- Monitor network traffic for large data exfiltration patterns following login attempts
- Review database logs for queries containing suspicious concatenation patterns or comment sequences
How to Mitigate CVE-2025-6871
Immediate Actions Required
- Remove or restrict public access to SourceCodester Simple Company Website until patched
- Implement input validation on the Username parameter to reject SQL special characters
- Deploy a web application firewall with SQL injection protection rules
- Review and audit all database access logs for potential compromise indicators
- Consider taking the application offline if it contains sensitive data and no immediate fix is available
Patch Information
As of the last update, no official vendor patch has been released for this vulnerability. Organizations using SourceCodester Simple Company Website 1.0 should monitor the SourceCodester website for security updates. Additional vulnerability details can be found at the VulDB entry and the GitHub PoC issue.
Workarounds
- Implement prepared statements or parameterized queries in /classes/Login.php as a code-level fix
- Add server-side input validation to reject special characters and SQL keywords in the username field
- Deploy a reverse proxy or WAF configured to sanitize or block SQL injection attempts
- Restrict network access to the application to trusted IP ranges only
- Consider replacing the vulnerable authentication module with a secure alternative implementation
# Example WAF rule for ModSecurity to block SQL injection in login parameters
SecRule ARGS:Username "@detectSQLi" \
"id:1001,\
phase:2,\
deny,\
status:403,\
log,\
msg:'SQL Injection attempt detected in Username field',\
tag:'CVE-2025-6871'"
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
