Authenticated SQL Injection and Unsafe Deserialization in Koollab LMS

Executive Summary

This vulnerability involves SQL injection and unsafe deserialization in Koollab LMS. An authenticated attacker can exploit the assessment overall answer endpoint to inject malicious SQL queries and control data passed to unserialize(), allowing them to write a webshell to a publicly accessible location and execute arbitrary code on the server.

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Detection Guidance

To detect this vulnerability, inspect network traffic for unusual SQL queries or unserialize() calls targeting the assessment overall answer endpoint in Koollab LMS. Check for unexpected file writes in publicly accessible directories. Use tools like SQLMap to test for SQL injection or monitor server logs for deserialization errors.

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Impact Analysis

This vulnerability allows an attacker to execute arbitrary code on the server, potentially leading to full system compromise, data theft, or unauthorized access to sensitive information stored in the LMS.

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Compliance Impact

This vulnerability could lead to unauthorized access or exposure of sensitive data, violating compliance requirements such as GDPR (data protection) and HIPAA (health information privacy), potentially resulting in legal penalties and reputational damage.

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Mitigation Strategies

Immediately update Koollab LMS to the latest patched version to address the SQL injection and unsafe deserialization vulnerabilities. Disable or restrict access to the assessment overall answer endpoint if possible. Review server logs for signs of webshell uploads or unusual activity. Implement input validation and output encoding for all user inputs. Consider isolating the LMS server from critical systems until patched.

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