Executive Summary

CVE-2017-20273 is a SQL injection vulnerability in Joomla Event Registration Pro Calendar version 4.1.3. It allows unauthenticated attackers to inject malicious SQL code through the 'id' parameter in GET requests to index.php with specific options. This injection enables attackers to execute arbitrary SQL queries on the backend database.

The vulnerability is exploited by sending specially crafted requests to the URL path /index.php?option=com_registrationpro&view=category&id=[SQL], where the 'id' parameter contains SQL injection payloads. This can be used to extract sensitive information from the database, such as table and column names.

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Impact Analysis

This vulnerability can have serious impacts including unauthorized access to sensitive database information. Attackers can extract confidential data by executing arbitrary SQL queries without authentication.

• Exposure of sensitive data stored in the database.
• Potential compromise of database integrity and confidentiality.
• Increased risk of further attacks leveraging the extracted information.

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Detection Guidance

This SQL injection vulnerability can be detected by sending crafted GET requests to the vulnerable Joomla component and observing the responses for SQL errors or unexpected data.

A typical detection command involves sending a request to the URL path with the 'id' parameter containing SQL injection payloads, for example:

• curl "http://[target]/index.php?option=com_registrationpro&view=category&id=1' UNION SELECT 1,table_name FROM information_schema.tables--"

If the response contains database table names or SQL error messages, it indicates the presence of the vulnerability.

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Mitigation Strategies

Immediate mitigation steps include restricting access to the vulnerable component, applying input validation or sanitization on the 'id' parameter, and updating or patching the Joomla Event Registration Pro Calendar component to a fixed version if available.

Until a patch is applied, consider implementing web application firewall (WAF) rules to block malicious SQL injection payloads targeting the 'id' parameter in requests to index.php with option=com_registrationpro.

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Compliance Impact

The SQL injection vulnerability in Joomla Event Registration Pro Calendar 4.1.3 allows unauthenticated attackers to extract sensitive database information. This unauthorized access to sensitive data can lead to violations of data protection regulations such as GDPR and HIPAA, which require the protection of personal and sensitive information from unauthorized disclosure.

Because attackers can execute arbitrary SQL queries and potentially access confidential data, organizations using the affected software may face compliance risks related to data confidentiality, integrity, and privacy mandates under these standards.

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