Compliance Impact

This vulnerability allows authenticated administrators to execute arbitrary code remotely, potentially leading to full system compromise including unauthorized access, modification, or deletion of sensitive data. Such a compromise can result in violations of data protection standards and regulations like GDPR and HIPAA, which require safeguarding confidentiality, integrity, and availability of personal and sensitive information. Therefore, exploitation of this vulnerability could lead to non-compliance with these regulations due to potential data breaches and unauthorized data processing. [1, 3]

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Executive Summary

This vulnerability is a flaw in CmsEasy up to version 7.7.7, specifically in the function savetemp_action within the /lib/admin/template_admin.php file of the Backend Template Management Page component. It allows an attacker to manipulate the argument content/tempdata, which can lead to code injection. The attack can be performed remotely, and an exploit has been published.

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Impact Analysis

The vulnerability can allow an attacker to inject and execute arbitrary code remotely on the affected system. This can lead to unauthorized access, data manipulation, or disruption of service, potentially compromising the confidentiality, integrity, and availability of the system.

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Detection Guidance

This vulnerability can be detected by checking for the presence of the vulnerable CmsEasy version (up to 7.7.7) and by searching for the vulnerable file `/lib/admin/template_admin.php`. Attackers may use Google dorking with queries like `inurl:lib/admin/template_admin.php` to identify vulnerable targets. On your system, you can verify if the vulnerable function `savetemp_action` exists in the specified file. Additionally, monitoring for unusual template edits or the presence of suspicious PHP code injected into template files under `/data/template/` can indicate exploitation. Since exploitation requires authenticated administrator access, reviewing admin activity logs for unexpected template modifications is recommended. Specific commands to detect signs of compromise include searching for webshell files (e.g., `shell.php`) in the web root or template directories, for example: `find /path/to/webroot -name 'shell.php'` or grepping for PHP eval usage in template files: `grep -r '<?php eval' /path/to/data/template/`. Network detection can include monitoring HTTP requests with the `pageset=1` parameter or unusual POST requests to template management endpoints. [1, 3]

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Mitigation Strategies

Immediate mitigation steps include: 1) Restrict access to the CmsEasy backend to trusted administrators only, ensuring strong authentication and limiting network exposure. 2) Avoid using CmsEasy versions up to 7.7.7; upgrade to a non-vulnerable version or replace the product if no patch is available. 3) Sanitize and filter PHP code tags (`<?php`, `<?`, `?>`) in template content before saving to prevent code injection. 4) Restrict or disable the use of the `pageset` parameter to authenticated administrators only to prevent unauthorized template loading from `/data/template/`. 5) Monitor and audit template files for unauthorized changes or injected code. 6) Implement a sandbox environment for template execution and consider applying Content Security Policy (CSP) to limit template functionality. Since no official patch or countermeasure is published, replacing the affected product or disabling the vulnerable functionality is advised. [3, 1]

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