SQL Injection and Unsafe Deserialization in Koollab LMS

Executive Summary

This vulnerability involves SQL injection and unsafe deserialization in Koollab LMS. An authenticated attacker could exploit the manual mark assessment endpoint to inject malicious SQL queries and control data passed to the unserialize function. This could allow writing a webshell to a publicly accessible location and executing arbitrary code on the server.

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Detection Guidance

Detecting this vulnerability requires checking for SQL injection attempts in the manual mark assessment endpoint and monitoring for unauthorized file writes to public locations. Inspect server logs for unusual SQL queries or unserialize() calls with suspicious payloads. Look for webshell files in web-accessible directories.

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Impact Analysis

This vulnerability allows an attacker to execute arbitrary code on the server, potentially leading to full system compromise. Sensitive data could be stolen, modified, or deleted, and the system could be used as a foothold for further attacks. The high CVSS score indicates severe impact on confidentiality, integrity, and availability.

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Compliance Impact

This vulnerability could lead to unauthorized access to sensitive data, violating GDPR and HIPAA requirements for data protection and confidentiality. Organizations using Koollab LMS may face compliance violations, legal penalties, and reputational damage due to potential data breaches.

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Mitigation Strategies

Immediately patch Koollab LMS to the latest version. Disable the manual mark assessment endpoint if not required. Implement input validation and parameterized queries for all user inputs. Restrict file write permissions to prevent webshell creation. Monitor for signs of compromise.

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