Open Redirect Vulnerability in Helix Ultimate Joomla Extension

Executive Summary

This vulnerability is an open redirect flaw in Joomla Extension Helix Ultimate versions before 2.2.10. It allows attackers to manipulate redirect parameters using arbitrary Base64 strings without validating if the target URL is internal. This could trick users into visiting malicious external sites.

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Detection Guidance

To detect this vulnerability, inspect Joomla sites using Helix Ultimate versions below 2.2.10 for open redirect flaws via Base64 parameters. Check server logs for suspicious redirect URLs containing base64-encoded values pointing to external domains. Use tools like grep to search for 'base64_decode' or 'base64' in template files. Verify if the 'return' parameter in URLs accepts arbitrary Base64 strings without validation.

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Impact Analysis

Attackers could exploit this to redirect users to phishing sites, malware downloads, or other malicious pages. Users might unknowingly expose sensitive data or install harmful software. Website owners may face reputational damage and loss of user trust.

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Compliance Impact

This vulnerability could lead to data breaches or unauthorized access, violating GDPR's data protection requirements and HIPAA's security rules for protected health information. Organizations may face fines or legal penalties for non-compliance due to insufficient safeguards.

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Mitigation Strategies

Update Helix Ultimate to version 2.2.10 or later to address the Base64 redirect parameter issue. Review server logs for suspicious redirect attempts and disable Base64-based redirect parameters if not required.

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