CVE-2019-25503: PHPads SQL Injection Vulnerability

CVE-2019-25503 Overview

PHPads 2.0 contains an SQL injection vulnerability that allows unauthenticated attackers to execute arbitrary SQL queries by injecting malicious code through the bannerID parameter in click.php3. Attackers can submit crafted bannerID values using SQL comment syntax and functions like extractvalue to extract sensitive database information such as the current database name.

Critical Impact

Unauthenticated attackers can exploit this SQL injection vulnerability to extract sensitive database information, potentially compromising user credentials, application data, and enabling further attacks against the underlying database server.

Affected Products

• PHPads 2.0

Discovery Timeline

• 2026-03-04 - CVE CVE-2019-25503 published to NVD
• 2026-03-05 - Last updated in NVD database

Technical Details for CVE-2019-25503

Vulnerability Analysis

This SQL injection vulnerability (CWE-89) exists in PHPads 2.0 within the click.php3 script. The application fails to properly sanitize or parameterize user input before incorporating it into SQL queries. When a user supplies a bannerID parameter, the value is directly concatenated into database queries without adequate input validation or escaping, creating a classic SQL injection attack surface.

The vulnerability is network-accessible and requires no authentication to exploit, making it particularly dangerous for internet-facing PHPads installations. While user interaction is required to trigger the vulnerability, the technical barrier for exploitation is low since well-documented SQL injection techniques apply directly.

Root Cause

The root cause of this vulnerability is improper input validation and the use of unsanitized user input in SQL query construction. The click.php3 script directly incorporates the bannerID parameter into database queries without using parameterized queries or prepared statements. This violates fundamental secure coding practices for database interaction and allows attackers to manipulate query logic by injecting SQL syntax.

Attack Vector

The attack vector leverages the bannerID parameter in click.php3 to inject malicious SQL code. Attackers craft payloads using SQL comment syntax (--, /**/) and XML-based extraction functions like extractvalue() to enumerate database contents. The exploitation process typically involves:

1. Identifying the vulnerable parameter in click.php3
2. Crafting a malicious bannerID value containing SQL injection payloads
3. Using error-based or time-based blind SQL injection techniques to extract data
4. Retrieving sensitive information such as database names, table structures, and user credentials

The exploitation methodology is well-documented in publicly available resources. For technical details on the attack patterns, refer to the Exploit-DB #46798 entry.

Detection Methods for CVE-2019-25503

Indicators of Compromise

• Unusual requests to click.php3 containing SQL syntax characters such as single quotes, double dashes, or semicolons in the bannerID parameter
• Web server logs showing requests with encoded SQL injection payloads including extractvalue, UNION SELECT, or ORDER BY statements
• Database error messages exposed in HTTP responses indicating SQL syntax errors
• Abnormal database query patterns or unexpected data access from the PHPads application

Detection Strategies

• Deploy web application firewall (WAF) rules to detect and block SQL injection patterns in the bannerID parameter
• Monitor web server access logs for suspicious requests to click.php3 with unusual parameter values
• Implement database activity monitoring to detect anomalous query patterns originating from the PHPads application
• Configure intrusion detection systems (IDS) with signatures for common SQL injection attack strings

Monitoring Recommendations

• Enable detailed logging for the click.php3 script to capture all incoming parameter values
• Set up alerts for database errors that may indicate SQL injection attempts
• Monitor for data exfiltration patterns that could indicate successful exploitation
• Implement network traffic analysis to detect large volumes of data being extracted from database servers

How to Mitigate CVE-2019-25503

Immediate Actions Required

• Immediately restrict public access to PHPads 2.0 installations until patches or workarounds can be applied
• Implement WAF rules to filter SQL injection patterns in the bannerID parameter
• Review web server logs for evidence of prior exploitation attempts
• Consider taking PHPads offline if it processes sensitive data and no mitigations are available

Patch Information

No vendor patch information is currently available for this vulnerability. Organizations should consult the VulnCheck SQL Injection Advisory for the latest remediation guidance. Given the age and severity of this vulnerability, organizations should evaluate whether PHPads 2.0 should continue to be used in production environments.

Workarounds

• Modify the click.php3 script to use parameterized queries or prepared statements for all database interactions involving the bannerID parameter
• Implement strict input validation to allow only numeric values for the bannerID parameter
• Deploy a reverse proxy or WAF with SQL injection filtering capabilities in front of the PHPads application
• Restrict network access to PHPads installations using firewall rules to limit exposure to trusted networks only

# Example WAF rule for ModSecurity to block SQL injection in bannerID
SecRule ARGS:bannerID "@detectSQLi" \
    "id:100001,\
    phase:2,\
    deny,\
    status:403,\
    log,\
    msg:'SQL Injection attempt detected in bannerID parameter',\
    tag:'CVE-2019-25503'"