CVE-2020-36951: Phpscript-sgh SQL Injection Vulnerability

CVE-2020-36951 Overview

CVE-2020-36951 is a time-based blind SQL injection vulnerability affecting Phpscript-sgh version 0.1.0. The vulnerability exists in the admin interface and allows attackers to manipulate database queries through the id parameter. By crafting malicious payloads that trigger time delays, attackers can extract sensitive database information through conditional sleep techniques, potentially compromising the entire database backend.

Critical Impact

Attackers can exploit this SQL injection vulnerability to extract sensitive database information, potentially including user credentials, personal data, and other confidential records stored in the database.

Affected Products

• Phpscript-sgh version 0.1.0

Discovery Timeline

• 2026-01-27 - CVE-2020-36951 published to NVD
• 2026-01-29 - Last updated in NVD database

Technical Details for CVE-2020-36951

Vulnerability Analysis

This vulnerability is classified under CWE-89 (Improper Neutralization of Special Elements used in an SQL Command), commonly known as SQL Injection. The flaw resides in the admin interface of Phpscript-sgh where user-supplied input via the id parameter is not properly sanitized before being incorporated into SQL queries.

Time-based blind SQL injection is a particularly insidious variant because it does not rely on visible error messages or direct data output. Instead, attackers infer information about the database by measuring response times when conditional time-delay statements (such as SLEEP() in MySQL) are injected into the query.

Root Cause

The root cause of this vulnerability is the failure to properly validate, sanitize, or parameterize user input before including it in SQL queries. The id parameter in the admin interface is directly concatenated into database queries without proper escaping or the use of prepared statements. This allows attackers to inject arbitrary SQL commands that manipulate query logic and database behavior.

Attack Vector

The attack is network-based and requires no authentication or user interaction, making it accessible to remote attackers. The exploitation process involves:

1. Identifying the vulnerable id parameter in the admin interface
2. Injecting payloads containing conditional time-delay functions
3. Measuring server response times to determine if conditions evaluate to true or false
4. Iteratively extracting data character by character through binary search techniques

For example, an attacker might inject a payload that causes the database to sleep for 5 seconds if the first character of the admin password hash equals a specific value. By observing the response delay, the attacker confirms or denies their hypothesis and proceeds to enumerate the complete value.

Technical details and proof-of-concept information can be found in the Exploit-DB #49192 entry and the VulnCheck Security Advisory.

Detection Methods for CVE-2020-36951

Indicators of Compromise

• Unusual HTTP requests to admin interface endpoints containing SQL syntax such as SLEEP(), BENCHMARK(), or WAITFOR DELAY
• Database logs showing slow queries or repeated queries with minimal variations in the id parameter
• Increased response latency patterns suggesting time-based injection attempts
• Multiple sequential requests to the same endpoint with incrementing numeric or character values in payloads

Detection Strategies

• Implement Web Application Firewall (WAF) rules to detect and block SQL injection patterns in request parameters
• Enable detailed database query logging to identify suspicious query patterns or unexpected sleep/delay operations
• Deploy intrusion detection systems (IDS) configured with SQL injection signature rules
• Monitor application logs for anomalous request patterns targeting the admin interface

Monitoring Recommendations

• Set up alerts for requests containing common SQL injection keywords (SLEEP, BENCHMARK, UNION, SELECT, WAITFOR)
• Monitor database performance metrics for unusual query execution times that could indicate time-based attacks
• Implement rate limiting on admin interface endpoints to slow down automated extraction attempts
• Correlate web server logs with database logs to identify injection attempts that successfully reach the database

How to Mitigate CVE-2020-36951

Immediate Actions Required

• Restrict access to the admin interface by IP whitelist or VPN requirement
• Implement a Web Application Firewall (WAF) with SQL injection protection rules
• Review and audit all database queries in the application for proper parameterization
• Consider taking the application offline if it processes sensitive data until a patch is applied

Patch Information

No official patch information is available from the vendor at this time. Organizations using Phpscript-sgh 0.1.0 should consider the following remediation approaches:

• Review the GitHub Repository for any updates or community patches
• Consult the VulnCheck Security Advisory for the latest remediation guidance
• Consider migrating to an alternative solution if the project is no longer maintained

Workarounds

• Use prepared statements with parameterized queries for all database operations involving user input
• Implement strict input validation on the id parameter to accept only expected integer values
• Deploy a reverse proxy or WAF to filter malicious SQL injection payloads before they reach the application
• Limit database user privileges to the minimum required, reducing the impact of successful exploitation

# Example WAF rule configuration (ModSecurity)
# Block common time-based SQL injection patterns
SecRule ARGS "@rx (?i)(sleep|benchmark|waitfor\s+delay|pg_sleep)" \
    "id:1001,phase:2,deny,status:403,msg:'Time-based SQL Injection Attempt Detected'"