提交 #887154: pagekit v1.0.18 Server-Side Request Forgery

## Overview

PageKit CMS v1.0.18 has an SSRF vulnerability in `UpdateController::downloadAction()`. The `$url` parameter is passed to `fopen()` without any filtering, so an authenticated admin can make the server request arbitrary internal URLs.

## Root Cause

File: `app/installer/src/Controller/UpdateController.php` Line 32-42

```php
public function downloadAction($url)
{
$file = tempnam(App::get('path.temp'), 'update_');
App::session()->set('system.update', $file);

if (!file_put_contents($file, @fopen($url, 'r'))) {
App::abort(500, 'Download failed or path not writable.');
}

return [];
}
```

## Fix

No patch available. Mitigations:

- Stop using PageKit (it's dead)
- Block `/admin/system/update/download` at WAF level
- Network-segment the web server away from sensitive internal services

• 来源: ⚠️ https://github.com/d0ctorsec/CVE-Reports/tree/main/CVE-Pagekit%E2%80%94v1.0.18-SSRF
• 用户: dactar (UID 73087)
• 提交: 2026-07-12 19時17分 (3 月前)
• 管理: 2026-09-02 21時35分 (2 months later)
• 状态: 重复
• VulDB条目: 238216 [Pagekit 1.0.18 UpdateController.php thedownloadAction/updateAction 权限提升]
• 积分: 0