: Implement strict whitelisting for file extensions (e.g., allowing only ) and sanitize all user-supplied input. File Permissions
| | Severity | |--------------------------|------------------------------------------------------------------------------| | CVSS Score (est.) | 9.8 (Critical) – AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H | | Authentication | None required | | User Interaction | None | | Complexity | Low (basic HTTP request forgery) | | Data Exposure | Full document repository + system files + DB credentials | | Persistence | High – webshell persists across reboots until manual deletion | seeddms 5.1.22 exploit
: The attacker uses the "Add Document" feature to upload a PHP script designed as a backdoor. : Implement strict whitelisting for file extensions (e
: By navigating to the specific directory where SeedDMS stores uploaded data (often a path like /data/1048576/ followed by the document ID), the attacker triggers the PHP script via a web browser. Even if you cannot upgrade immediately, you can
Even if you cannot upgrade immediately, you can mitigate the risk at the server level. Configure your web server (Apache or Nginx) to prevent PHP execution in the directory where SeedDMS stores uploaded documents. deny from all Use code with caution. 3. Implement Strict File Filtering
Bryan found that a user with basic "write" permissions could upload more than just PDFs or text files. He realized he could upload a specialized PHP script —essentially a master key disguised as a document. The Upload