CVE-2021-47902 Overview
CVE-2021-47902 is a SQL Injection vulnerability affecting Testa Online Test Management System version 3.4.7. The vulnerability allows attackers to manipulate database queries through the q search parameter. By injecting malicious SQL code in the search field, attackers can extract database information, potentially accessing sensitive user credentials, test data, or other confidential system information stored in the backend database.
Critical Impact
Unauthenticated attackers can exploit this SQL injection flaw to extract sensitive database contents, potentially compromising user accounts, personal information, and system configurations.
Affected Products
- Testa Online Test Management System version 3.4.7
Discovery Timeline
- 2026-01-27 - CVE CVE-2021-47902 published to NVD
- 2026-01-29 - Last updated in NVD database
Technical Details for CVE-2021-47902
Vulnerability Analysis
This SQL Injection vulnerability (CWE-89) exists in the search functionality of Testa Online Test Management System. The application fails to properly sanitize user-supplied input in the q search parameter before incorporating it into SQL queries. This classic input validation failure allows attackers to break out of the intended query structure and execute arbitrary SQL statements against the underlying database.
The vulnerability is accessible over the network without requiring authentication, making it particularly dangerous for internet-facing deployments. Successful exploitation enables attackers to read sensitive data from the database, potentially including user credentials, test questions and answers, personal student information, and administrative data.
Root Cause
The root cause is improper input validation and lack of parameterized queries in the search functionality. When user input from the q parameter is directly concatenated into SQL queries without proper sanitization or the use of prepared statements, it creates an injection point that attackers can exploit to manipulate the query logic.
Attack Vector
The attack is network-based and requires no authentication or user interaction. An attacker can craft malicious HTTP requests containing SQL injection payloads in the q search parameter. The injected SQL code is then executed by the database server with the privileges of the application's database user account.
Typical exploitation techniques include UNION-based injection to extract data from other tables, boolean-based blind injection to infer database contents, and time-based blind injection when direct output is not available. The Exploit-DB #49194 reference provides additional technical details on exploitation methods.
Detection Methods for CVE-2021-47902
Indicators of Compromise
- Unusual SQL syntax patterns appearing in web application logs, particularly in requests to search endpoints
- Anomalous database query patterns including UNION SELECT, OR 1=1, time-delay functions like SLEEP() or WAITFOR
- Unexpected database errors exposed in application responses
- Large data exfiltration from the database server to external hosts
Detection Strategies
- Implement Web Application Firewall (WAF) rules to detect and block common SQL injection patterns in the q parameter
- Monitor application logs for requests containing SQL keywords like SELECT, UNION, INSERT, DROP, or comment sequences (--, /*)
- Enable database query logging and alert on queries with suspicious patterns or abnormal execution times
- Deploy intrusion detection systems (IDS) with signatures for SQL injection attack patterns
Monitoring Recommendations
- Establish baseline metrics for database query performance and alert on deviations that may indicate time-based blind SQL injection attempts
- Monitor for unusual access patterns to the search functionality, such as rapid sequential requests with varying parameters
- Track database user activity for unauthorized data access or privilege escalation attempts
- Review web server access logs for suspicious query string parameters containing encoded SQL characters
How to Mitigate CVE-2021-47902
Immediate Actions Required
- Restrict public access to the Testa Online Test Management System until the vulnerability is remediated
- Implement Web Application Firewall rules to filter SQL injection payloads targeting the q parameter
- Review database logs for signs of previous exploitation attempts
- Consider network segmentation to limit database access from the web application tier
Patch Information
No official vendor patch information is available at this time. The Archived Testa.cc Site indicates the vendor's website may no longer be actively maintained. Organizations should consult the VulnCheck Security Advisory for the latest remediation guidance and consider migrating to actively maintained alternatives if patches are unavailable.
Workarounds
- Deploy a Web Application Firewall (WAF) configured with SQL injection detection rules to inspect and sanitize the q parameter
- Implement input validation at the application level to reject requests containing SQL metacharacters or keywords
- Apply the principle of least privilege to the database user account used by the application, restricting it to only necessary tables and operations
- Consider taking the application offline or restricting access to trusted networks until a permanent fix is available
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
