Admidio allows Unauthenticated Access to Role-Restricted documents via neutralized .htaccess
Summary
Admidio relies on adm_my_files/.htaccess to deny direct HTTP access to uploaded documents. The Docker image ships with AllowOverride None in the Apache configuration, which causes Apache to silently ignore all .htaccess files. As a result, any file uploaded to the
documents module regardless of the _role-based_ permissions configured in the UI, is directly accessible over HTTP without authentication by anyone who knows the file path. The file path is disclosed in the upload response JSON.
Root Cause
File 1: Intended protection (ignored):
adm_my_files/.htaccess
```apache
Require all denied
```
<img width="408" height="403" alt="imagen" src="https://github.com/user-attachments/assets/95f0d389-a1a9-4dc4-9840-7f189d2c58ff" />
File 2: Apache config that neutralizes it:
- Command in order to search in Docker container:
docker exec admidio-sec-app cat /etc/apache2/apache2.conf
/etc/apache2/apache2.conf (Docker image)
```apache
<Directory ${APACHE_DOCUMENT_ROOT}>
AllowOverride None
</Directory>
```
<img width="492" height="328" alt="imagen" src="https://github.com/user-attachments/assets/2f2e09b1-0c2e-4932-8698-a40f6b92e917" />
AllowOverride None instructs Apache to skip .htaccess processing entirely, the deny rule never executes. The upload directory is inside the web root at /opt/app-root/src/adm_my_files/ and returns HTTP 200 for direct requests.
File 3: Upload response leaks the direct URL: system/file_upload.php, upload response JSON:
<img width="1528" height="624" alt="imagen" src="https://github.com/user-attachments/assets/50e66fde-ff41-4efa-adc9-ceeb5b23a97d" />
```json
{
"files": [{
"name": "sensitive_poc.txt",
"url": "http://TARGET/adm_my_files/documents_research/TEST-SENSITIVE/sensitive_poc.txt"
}]
}
```
Verified PoC
Step 1: Admin creates a restricted folder (visible only to Administrator role):
> modules/documents-files.php → permissions set to role Administrator only.
<img width="1161" height="784" alt="imagen" src="https://github.com/user-attachments/assets/25d81e44-9a7c-4991-b72e-6e664d176695" />
Step 2: Admin uploads a file to the restricted folder.
> Upload response returns:
```
http://TARGET/adm_my_files/documents_research/TEST-SENSITIVE/sensitive_poc.txt
```
<img width="1239" height="294" alt="imagen" src="https://github.com/user-attachments/assets/84c1bcd1-47d7-4115-ac0f-653b0a6d7301" />
Step 3: Unauthenticated request retrieves the file:
```bash
curl -X GET 'http://TARGET/adm_my_files/documents_research/TEST-SENSITIVE/sensitive_poc.txt'
# Response: full file contents — no authentication required
```
<img width="1051" height="150" alt="imagen" src="https://github.com/user-attachments/assets/1ed7fab7-59cb-4d5b-8c60-12108490d1e4" />
Step 4: Confirm folder is role-restricted:
```sql
SELECT fil_name, fol_name, fol_public FROM adm_files JOIN adm_folders ON fil_fol_id = fol_id
ORDER BY fil_id DESC LIMIT 5; -- fol_public = 0, role restricted — yet file is publicly accessible
```
Impact
- Any document uploaded to Admidio including files restricted to specific roles is publicly accessible via direct HTTP request with no authentication required
- Role-based access control on the documents module is completely bypassed at the filesystem level
- Sensitive organizational documents (contracts, member data, financial records) are exposed to anyone who can guess or construct the file path
- The upload API response discloses the direct URL to the uploader, making path enumeration trivial
Recommended Fix
Option 1 (preferred): Enable AllowOverride in Apache config:
```apache
<Directory /opt/app-root/src/adm_my_files>
AllowOverride All
</Directory>
```
Option 2: Move uploads outside the web root:
Store uploaded files in a directory outside DOCUMENT_ROOT and serve them exclusively through Admidio's download handler (modules/documents-files.php?mode=download), which enforces role checks before serving the file.
Option 3: Apache-level explicit deny (does not require .htaccess):
```apache
<Directory /opt/app-root/src/adm_my_files>
Require all denied
</Directory>
```
> The most robust long-term fix is Option 2 — moving uploads outside the web root eliminates the dependency on Apache configuration correctness entirely.
Reported by: Juan Felipe Oz [@JF0x0r](https://x.com/PwnedRar_)
> [LinkedIn](https://www.linkedin.com/in/juanfelipeoz/)
