Remote Code Execution in AcyMailing Enterprise Extension

Executive Summary

This is a Remote Code Execution (RCE) vulnerability in the AcyMailing Enterprise Joomla extension versions before 11.1.0. It allows attackers to execute arbitrary code on the server by sending an email with a malicious MIME part to a monitored mailbox. The system saves the MIME part to a web-accessible directory without checking file extensions, enabling attackers to upload PHP files that can be executed remotely.

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Detection Guidance

Check for unexpected PHP files in media/com_acym/upload/ directory. Monitor mailbox activity for suspicious MIME parts or files with no extensions. Review web server logs for unusual file writes or access to recently created files.

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Impact Analysis

If you use the vulnerable AcyMailing Enterprise extension on Joomla, an attacker could gain full control of your server by sending a specially crafted email. This could lead to data theft, website defacement, malware distribution, or complete system compromise. The impact includes unauthorized access to sensitive data and potential disruption of services.

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Compliance Impact

This vulnerability could lead to severe compliance violations under GDPR and HIPAA. Unauthorized access to personal or health data due to server compromise may result in data breaches, triggering mandatory notifications and potential fines. Organizations could face legal penalties for failing to protect sensitive information adequately.

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Mitigation Strategies

Upgrade AcyMailing Enterprise to version 11.1.0 or later. Remove any unauthorized PHP files from media/com_acym/upload/. Restrict write permissions to the upload directory. Monitor for signs of exploitation and review mailbox configurations.

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