CVE-2021-41691

Comprehensive Technical Analysis of CVE-2021-41691

1. Vulnerability Assessment and Severity Evaluation

CVE ID: CVE-2021-41691 Description: A SQL injection vulnerability exists in OS4Ed Open Source Information System Community v8.0 via the "student_id" and "TRANSFER{SCHOOL]" parameters in POST request sent to /TransferredOutModal.php. CVSS Score: 9.8

Severity Evaluation: The CVSS score of 9.8 indicates a critical vulnerability. This high score is due to the potential for unauthorized access to sensitive data, the ease of exploitation, and the significant impact on the confidentiality, integrity, and availability of the system.

2. Potential Attack Vectors and Exploitation Methods

Attack Vectors:

• SQL Injection: An attacker can craft malicious SQL statements and inject them into the "student_id" and "TRANSFER{SCHOOL]" parameters. This can lead to unauthorized access to the database, data manipulation, and potential data exfiltration.
• POST Request Manipulation: The vulnerability is exploited through a POST request to /TransferredOutModal.php, making it possible for attackers to manipulate the request parameters to inject malicious SQL code.

Exploitation Methods:

• Manual Exploitation: An attacker can manually craft a POST request with malicious SQL code in the vulnerable parameters.
• Automated Tools: Attackers can use automated SQL injection tools to identify and exploit the vulnerability.

3. Affected Systems and Software Versions

Affected Systems:

• OS4Ed Open Source Information System Community v8.0

Software Versions:

• The vulnerability specifically affects version 8.0 of the OS4Ed Open Source Information System.

4. Recommended Mitigation Strategies

Immediate Actions:

• Patching: Apply the latest security patches provided by the vendor to mitigate the vulnerability.
• Input Validation: Implement strict input validation and sanitization for all user inputs, especially for the "student_id" and "TRANSFER{SCHOOL]" parameters.
• Parameterized Queries: Use parameterized queries or prepared statements to prevent SQL injection attacks.
• Web Application Firewall (WAF): Deploy a WAF to monitor and block malicious SQL injection attempts.

Long-Term Strategies:

• Regular Security Audits: Conduct regular security audits and vulnerability assessments to identify and mitigate potential vulnerabilities.
• Security Training: Provide security training for developers to ensure they are aware of common vulnerabilities and best practices for secure coding.
• Code Review: Implement a robust code review process to identify and fix security issues early in the development cycle.

5. Impact on Cybersecurity Landscape

Immediate Impact:

• Data Breach: The vulnerability can lead to unauthorized access to sensitive student information, including personal data and academic records.
• System Compromise: Attackers can gain control over the database, leading to potential data manipulation and system compromise.

Long-Term Impact:

• Reputation Damage: Educational institutions using the affected software may suffer reputational damage due to data breaches.
• Compliance Issues: Non-compliance with data protection regulations can result in legal consequences and financial penalties.

6. Technical Details for Security Professionals

Vulnerability Details:

• Vulnerable Parameters: "student_id" and "TRANSFER{SCHOOL]"
• Vulnerable Endpoint: /TransferredOutModal.php
• Exploitation Method: SQL injection via POST request

Example Exploit:

POST /TransferredOutModal.php HTTP/1.1
Host: vulnerable-system.com
Content-Type: application/x-www-form-urlencoded

student_id=1'; DROP TABLE students; --
TRANSFER{SCHOOL]=1

Mitigation Code Example:

// Using prepared statements in PHP
$stmt = $pdo->prepare("SELECT * FROM students WHERE student_id = :student_id AND TRANSFER{SCHOOL] = :transfer_school");
$stmt->bindParam(':student_id', $student_id);
$stmt->bindParam(':transfer_school', $transfer_school);
$stmt->execute();

References:

• OS4Ed Open Source Information System GitHub Repository
• OpenSIS Official Website
• Third Party Advisory

By addressing this vulnerability promptly and implementing robust security measures, organizations can protect sensitive data and maintain the integrity of their systems.