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# 🔒 Security Vulnerabilities - File Access & Download

**Date:** 2025-12-02  
**Severity:** 🔴 **HIGH**  
**Status:** ⚠️ **NEEDS IMMEDIATE FIX**

## 🚨 Vulnerabilities Found

### 1. Path Traversal in File Downloads

**Affected Files:**
- `api/download_track.php` (line 70)
- `api/download_crate_track.php` (lines 139-155)
- `utils/play_audio.php` (line 237)
- `utils/audiofiles_public.php` (line 48)

**Issue:**
File paths are constructed from database values (`audio_url`) without proper validation. If an attacker can manipulate the database or if stored values contain path traversal sequences (`../`), they could access files outside the intended directory.

**Example Attack:**
```php
// If audio_url in database is: "../../../etc/passwd"
$file_path = $_SERVER['DOCUMENT_ROOT'] . parse_url($audio_url, PHP_URL_PATH);
// Could result in: /var/www/html/../../../etc/passwd
```

**Risk:**
- 🔴 **HIGH** - Unauthorized file access
- Could expose sensitive files (config files, passwords, etc.)
- Could allow reading arbitrary files on the server

### 2. Missing Session Check

**Affected File:**
- `utils/audiofiles_public.php` (line 35)

**Issue:**
`session_start()` is commented out, but the code still tries to use `$_SESSION['user_id']`. This could cause:
- Undefined variable errors
- Potential bypass of authentication checks
- Inconsistent behavior

**Risk:**
- 🟡 **MEDIUM** - Authentication bypass potential
- Could allow unauthorized access if session check fails

### 3. Insufficient Path Validation

**Affected Files:**
- All download handlers

**Issue:**
While `realpath()` is used in some places, it's not consistently applied, and paths aren't validated to ensure they're within allowed directories before using `realpath()`.

**Risk:**
- 🟡 **MEDIUM** - Path traversal still possible in edge cases

## ✅ Recommended Fixes

### Fix 1: Add Path Validation Function

Create a secure path validation function that:
1. Validates paths are within allowed directories
2. Prevents path traversal
3. Normalizes paths safely

### Fix 2: Whitelist Allowed Directories

Only allow file access from specific whitelisted directories:
- `/audio_files/`
- `/uploads/`
- Other explicitly allowed directories

### Fix 3: Validate Database Values

Before using `audio_url` from database:
1. Validate it matches expected patterns
2. Check it's within allowed directories
3. Sanitize any user-controlled input

### Fix 4: Fix Session Handling

- Uncomment `session_start()` in `audiofiles_public.php`
- Or remove session dependency if public access is intended
- Add proper authentication checks

## 🎯 Priority Actions

1. **IMMEDIATE** - Fix path traversal vulnerabilities
2. **HIGH** - Add path validation to all file handlers
3. **MEDIUM** - Fix session handling in `audiofiles_public.php`
4. **MEDIUM** - Add comprehensive input validation

## 📝 Files Requiring Fixes

1. ✅ `api/download_track.php` - Add path validation
2. ✅ `api/download_crate_track.php` - Add path validation
3. ✅ `utils/play_audio.php` - Add path validation
4. ✅ `utils/audiofiles_public.php` - Fix session + path validation
5. ✅ `api/download_variation.php` - Review and add validation