Executive Summary

This vulnerability is a security flaw in EyouCMS up to version 1.7.6, specifically in an unknown function within the file /application/admin/logic/FilemanagerLogic.php related to Backend Template Management. It allows an attacker to manipulate the 'content' argument to perform an SQL injection attack remotely.

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Impact Analysis

The vulnerability can lead to unauthorized access or manipulation of the database through SQL injection, potentially compromising data confidentiality, integrity, and availability. Since the attack can be launched remotely, it poses a significant risk to systems using the affected EyouCMS versions.

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Detection Guidance

This vulnerability can be detected by checking for the presence of the vulnerable file `/application/admin/logic/FilemanagerLogic.php` in EyouCMS versions up to 1.7.6. Additionally, administrators can look for suspicious template files containing `{eyou:sql}` tags that execute arbitrary SQL queries, especially those using MySQL's INTO OUTFILE feature to write files to the webroot. A suggested method includes searching for the vulnerable file via web server directories or using Google dorking with the query `inurl:application/admin/logic/FilemanagerLogic.php` to identify exposed instances. Monitoring for unusual template files like `poc_shell.htm` or unexpected `{eyou:include}` directives in main templates (e.g., `index.htm`) may also help detect exploitation attempts. Specific commands might include: 1) Using find or grep on the server to locate template files with `{eyou:sql}` tags, e.g., `grep -r '{eyou:sql}' /path/to/eyoucms/templates/`; 2) Using Google dorking externally with `inurl:application/admin/logic/FilemanagerLogic.php` to find vulnerable installations. Note that exploitation requires authenticated administrator access, so monitoring admin login activity and template changes is also recommended. [1, 3]

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Mitigation Strategies

Immediate mitigation steps include restricting or disabling administrator access to the backend template management system until a patch or fix is available. Since the vendor has not responded and no official patch exists, it is recommended to replace or upgrade the affected component to a non-vulnerable version or alternative product. Administrators should audit and remove any suspicious template files that contain `{eyou:sql}` tags or unauthorized includes. Additionally, monitoring and restricting the use of template tags that allow SQL execution, especially `{eyou:sql}`, can reduce risk. Applying strict input validation and limiting permissions of the database user to prevent file writes via INTO OUTFILE can also help mitigate exploitation. Finally, monitoring logs for unusual template modifications or webshell access attempts is advised. [3]

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