"""
For testing purposes only.
(c) Yong Chuan, Koh 2014
"""
from time import sleep
from socket import *
from struct import *
from random import *
import sys, os, argparse
HOST = None
PORT = 623
bufsize = 1024
recv = ""
# create socket
UDPsock = socket(AF_INET,SOCK_DGRAM)
UDPsock.settimeout(2)
data = 21 #offset of data start
RMCP = ('\x06' + #RMCP.version = ASF RMCP v1.0
'\x00' + #RMCP.reserved
'\xFF' + #RMCP.seq
'\x07' #RMCP.Type/Class = Normal_RMCP/IPMI
)
def SessionHeader (ipmi, auth_type='None', seq_num=0, sess_id=0, pwd=None):
auth_types = {'None':0, 'MD2':1, 'MD5':2, 'Reserved':3, 'Straight Pwd':4, 'OEM':5}
sess_header = ''
sess_header += pack('<B', auth_types[auth_type])
sess_header += pack('<L', seq_num)
sess_header += pack('<L', sess_id)
if auth_type is not 'None':
raw = pwd + pack('<L', sess_id) + ipmi + pack('<L', seq_num) + pwd
import hashlib
h = hashlib.md5(raw)
sess_header += h.digest()
sess_header += pack('B', len(ipmi))
return sess_header
class CreateIPMI ():
def __init__ (self):
self.priv_lvls = {'Reserved':0, 'Callback':1, 'User':2, 'Operator':3, 'Admin':4, 'OEM':5, 'NO ACCESS':15 }
self.priv_lvls_2 = {0:'Reserved', 1:'Callback', 2:'User', 3:'Operator', 4:'Admin', 5:'OEM', 15:'NO ACCESS'}
self.auth_types = {'None':0, 'MD2':1, 'MD5':2, 'Reserved':3, 'Straight Pwd':4, 'OEM':5}
def CheckSum (self, bytes):
chksum = 0
q = ''
for i in bytes:
q += '%02X ' %ord(i)
chksum = (chksum + ord(i)) % 0x100
if chksum > 0:
chksum = 0x100 - chksum
return pack('>B', chksum)
def Header (self, cmd, seq_num=0x00):
#only for IPMI v1.5
cmds = {'Get Channel Auth Capabilities' : (0x06, 0x38), #(netfn, cmd_code)
'Get Session Challenge' : (0x06, 0x39),
'Activate Session' : (0x06, 0x3a),
'Set Session Privilege Level' : (0x06, 0x3b),
'Close Session' : (0x06, 0x3c),
'Set User Access' : (0x06, 0x43),
'Get User Access' : (0x06, 0x44),
'Set User Name' : (0x06, 0x45),
'Get User Name' : (0x06, 0x46),
'Set User Password' : (0x06, 0x47),
'Get Chassis Status' : (0x00, 0x01)}
ipmi_header = ''
ipmi_header += pack('<B', 0x20) #target addr
ipmi_header += pack('<B', cmds[cmd][0]<<2 | 0) #netfn | target lun
ipmi_header += self.CheckSum (ipmi_header)
ipmi_header += pack('<B', 0x81) #source addr
ipmi_header += pack('<B', seq_num<<2 | 0) #seq_num | source lun
ipmi_header += pack('<B', cmds[cmd][1]) #IPMI message command
return ipmi_header
def GetChannelAuthenticationCapabilities (self, hdr_seq, chn=0x0E, priv_lvl='Admin'):
ipmi = ''
ipmi += self.Header('Get Channel Auth Capabilities', hdr_seq)
ipmi += pack('<B', 0<<7 | chn) #IPMI v1.5 | chn num (0-7, 14=current_chn, 15)
ipmi += pack('<B', self.priv_lvls[priv_lvl]) #requested privilege level
ipmi += self.CheckSum (ipmi[3:])
return ipmi
def GetSessionChallenge (self, hdr_seq, username, auth_type='MD5'):
#only for IPMI v1.5
ipmi = ''
ipmi += self.Header('Get Session Challenge', hdr_seq)
ipmi += pack('<B', self.auth_types[auth_type]) #authentication type
ipmi += username #user name
ipmi += self.CheckSum(ipmi[3:])
return ipmi
def ActivateSession (self, hdr_seq, authcode, auth_type='MD5', priv_lvl='Admin'):
#only for IPMI v1.5
ipmi = ''
ipmi += self.Header('Activate Session', hdr_seq)
ipmi += pack('>B', self.auth_types[auth_type])
ipmi += pack('>B', self.priv_lvls[priv_lvl])
ipmi += authcode #challenge string
ipmi += pack('<L', 0xdeadb0b0) #initial outbound seq num
ipmi += self.CheckSum(ipmi[3:])
return ipmi
def SetSessionPrivilegeLevel (self, hdr_seq, priv_lvl='Admin'):
#only for IPMI v1.5
ipmi = ''
ipmi += self.Header('Set Session Privilege Level', hdr_seq)
ipmi += pack('>B', self.priv_lvls[priv_lvl])
ipmi += self.CheckSum(ipmi[3:])
return ipmi
def CloseSession (self, hdr_seq, sess_id):
ipmi = ''
ipmi += self.Header ("Close Session", hdr_seq)
ipmi += pack('<L', sess_id)
ipmi += self.CheckSum(ipmi[3:])
return ipmi
def GetChassisStatus (self, hdr_seq):
ipmi = ''
ipmi += self.Header ("Get Chassis Status", hdr_seq)
ipmi += self.CheckSum(ipmi[3:])
return ipmi
def GetUserAccess (self, hdr_seq, user_id, chn_num=0x0E):
ipmi = ''
ipmi += self.Header ("Get User Access", hdr_seq)
ipmi += pack('>B', chn_num) #chn_num = 0x0E = current channel
ipmi += pack('>B', user_id)
ipmi += self.CheckSum(ipmi[3:])
return ipmi
def GetUserName (self, hdr_seq, user_id=2):
ipmi = ''
ipmi += self.Header ("Get User Name", hdr_seq)
ipmi += pack('>B', user_id)
ipmi += self.CheckSum(ipmi[3:])
return ipmi
def SetUserName (self, hdr_seq, user_id, user_name):
#Assign user_name to user_id, replaces if user_id is occupied
ipmi = ''
ipmi += self.Header ("Set User Name", hdr_seq)
ipmi += pack('>B', user_id)
ipmi += user_name.ljust(16, '\x00')
ipmi += self.CheckSum(ipmi[3:])
return ipmi
def SetUserPassword (self, hdr_seq, user_id, password, op='set password'):
ops = {'disable user':0, 'enable user':1, 'set password':2, 'test password':3}
ipmi = ''
ipmi += self.Header ("Set User Password", hdr_seq)
ipmi += pack('>B', user_id)
ipmi += pack('>B', ops[op])
ipmi += password.ljust(16, '\x00') #IPMI v1.5: 16bytes | IPMI v2.0: 20bytes
ipmi += self.CheckSum(ipmi[3:])
return ipmi
def SetUserAccess (self, hdr_seq, user_id, new_priv, chn=0x0E):
ipmi = ''
ipmi += self.Header ("Set User Access", hdr_seq)
ipmi += pack('<B', 1<<7 | 0<<6 | 0<<5 | 1<<4 | chn) #bit4=1=enable user for IPMI Messaging | chn=0xE=current channel
ipmi += pack('>B', user_id)
ipmi += pack('>B', self.priv_lvls[new_priv])
ipmi += pack('>B', 0)
ipmi += self.CheckSum(ipmi[3:])
return ipmi
def SendUDP (pkt):
global HOST, PORT, data
res = ''
code = ipmi_seq = 0xFFFF
for i in range(5):
try:
UDPsock.sendto(pkt, (HOST, PORT))
res = UDPsock.recv(bufsize)
except Exception as e:
print '[-] Socket Timeout: Try %d'%i
sleep (0)
else:
#have received a reply
if res[4:5] == '\x02': #Session->AuthType = MD5
data += 16
code = unpack('B',res[data-1:data])[0]
ipmi_seq= unpack('B',res[data-3:data-2])[0]>>2
if res[4:5] == '\x02':
data -= 16
break
return code, ipmi_seq, res
def SetUpSession (username, pwd, priv='Admin', auth='MD5'):
global data
#Get Channel Authentication Capabilities
ipmi = CreateIPMI().GetChannelAuthenticationCapabilities(0, chn=0xE, priv_lvl=priv)
code, ipmi_seq, res = SendUDP (RMCP + SessionHeader(ipmi) + ipmi)
if code != 0x00:
return code, 0, 0, 0
#print '[+]%-30s: %02X (%d)'%('Get Chn Auth Capabilities', code, ipmi_seq)
#Get Session Challenge
ipmi = CreateIPMI().GetSessionChallenge(1, username, 'MD5')
code, ipmi_seq, res = SendUDP (RMCP + SessionHeader(ipmi) + ipmi)
if code != 0x00:
if code == 0xFFFF:
print "[-] BMC didn't respond to IPMI v1.5 session setup"
print " If firmware had disabled it, then BMC is not vulnerable"
return code, 0, 0, 0
temp_sess_id = unpack('<L', res[data:data+4])[0]
challenge_str = res[data+4:data+4+16]
#print '[+]%-30s: %02X (%d)'%('Get Session Challenge', code, ipmi_seq)
#Activate Session
ipmi = CreateIPMI().ActivateSession(2, challenge_str, auth, priv)
code, ipmi_seq, res = SendUDP (RMCP + SessionHeader(ipmi, auth, 0, temp_sess_id, pwd) + ipmi)
if code != 0x00:
return code, 0, 0, 0
data += 16
sess_auth_type = unpack('B', res[data:data+1])[0]
sess_id = unpack('<L', res[data+1:data+1+4])[0]
ini_inbound = sess_hdr_seq = unpack('<L', res[data+5:data+5+4])[0]
sess_priv_lvl = unpack('B', res[data+9:data+9+1])[0]
#print '[+]%-30s: %02X (%d)'%('Activate Session', code, ipmi_seq)
#print ' %-30s: Session_ID %08X'%sess_id
data -= 16
#Set Session Privilege Level
ipmi = CreateIPMI().SetSessionPrivilegeLevel(3, priv)
code, ipmi_seq, res = SendUDP (RMCP + SessionHeader(ipmi, 'None', sess_hdr_seq, sess_id) + ipmi)
sess_hdr_seq += 1
if code != 0x00:
return code, 0, 0, 0
new_priv_lvl = unpack('B', res[data:data+1])[0]
#print '[+]%-30s: %02X (%d)'%('Set Session Priv Level', code, ipmi_seq)
return code, temp_sess_id, sess_hdr_seq, sess_id
def CloseSession (sess_seq, sess_id):
global data
#Close Session
ipmi = CreateIPMI().CloseSession(5, sess_id)
code, ipmi_seq, res = SendUDP (RMCP + SessionHeader(ipmi, 'None', sess_seq, sess_id) + ipmi)
#print '[+]%-30s: %02X (%d)'%('Close Session', code, ipmi_seq)
return code
def CheckSessionAlive(sess_seq, sess_id):
#SetUserPassword(): "user enable <user_id>"
ipmi = CreateIPMI().GetChassisStatus(31)
code, ipmi_seq, res = SendUDP (RMCP + SessionHeader(ipmi, 'None', sess_seq, sess_id) + ipmi)
print '[+] %-35s: %02X (%d)'%('CheckSessionAlive->GetChassisStatus', code, ipmi_seq)
sess_seq += 1
return sess_seq
def banner():
print ("######################################################\n"+\
"## This tool checks whether a BMC machine is vulnerable to CVE-2014-8272\n"+\
"## (http://www.kb.cert.org/vuls/id/843044)\n"+\
"## by logging the TemporarySessionID/SessionID in each IPMI v1.5 session,\n"+\
"## and checking that these values are incremental\n"+\
"## \n"+\
"## Author: Yong Chuan, Koh\n"+\
"## Email: yongchuan.koh@mwrinfosecurity.com\n"+\
"## (c) Yong Chuan, Koh 2014\n"+\
"######################################################\n")
def main():
banner()
#default usernames/passwords (https://community.rapid7.com/community/metasploit/blog/2013/07/02/a-penetration-testers-guide-to-ipmi)
vendors = {"HP" :{"user":"Administrator", "pwd":""}, #no default pwd: <factory randomized 8-character string>
"DELL" :{"user":"root", "pwd":"calvin"},
"IBM" :{"user":"USERID", "pwd":"PASSW0RD"},
"FUJITSU" :{"user":"admin", "pwd":"admin"},
"SUPERMICRO" :{"user":"ADMIN", "pwd":"ADMIN"},
"ORACLE" :{"user":"root", "pwd":"changeme"},
"ASUS" :{"user":"admin", "pwd":"admin"}
}
arg = argparse.ArgumentParser(description="Test for CVE-2014-8272: Use of Insufficiently Random Values")
arg.add_argument("-i", "--ip", required=True, help="IP address of BMC server")
arg.add_argument("-u", "--udpport", nargs="?", default=623, type=int, help="Port of BMC server (optional: default 623)")
arg.add_argument("-v", "--vendor", nargs="?", help="Server vendor of BMC (optional: for default BMC credentials)")
arg.add_argument("-n", "--username", nargs="?", default=None, help="Username of BMC account (optional: for non-default credentials)")
arg.add_argument("-p", "--password", nargs="?", default=None, help="Password of BMC account (optional: for non-default credentials)")
args = arg.parse_args()
if args.vendor is not None: args.vendor = args.vendor.upper()
if (args.vendor is None or args.vendor not in vendors.keys()) and (args.username is None or args.password is None):
print "[-] Error: -n and -p are required because -v is not specified/in default list"
print " Vendors with Default Accounts"
print " -----------------------------------"
for vendor,acct in vendors.iteritems():
print " %s: username='%s', password='%s'"%(vendor,acct["user"],acct["pwd"])
sys.exit(1)
if args.username is None: args.username = vendors[args.vendor]["user"].ljust(16, '\x00')
if args.password is None: args.password = vendors[args.vendor]["pwd"].ljust(16, '\x00')
global HOST, PORT
HOST = args.ip
PORT = args.udpport
print "Script Parameters"
print "-------------------------"
print "IP : %s"%HOST
print "Port : %d"%PORT
print "Username : %s"%args.username
print "Password : %s"%args.password
session_ids = []
for i in xrange(0x80): #do not go beyond 0xFF, because of how session_ids is checked for incremental later
try:
code, temp_sess_id, sess_seq, sess_id = SetUpSession (args.username, args.password, priv='Admin', auth='MD5')
if code == 0:
session_ids.append(temp_sess_id)
session_ids.append(sess_id)
print '[+%04X] temp_sess_id=%08X, sess_id=%08X'%(i, temp_sess_id, sess_id)
else:
#print '[-%04X] SetUp Session: Trying again after timeout 5s'%(i)
sleep(5)
continue
code = CloseSession (sess_seq, sess_id)
if code == 0:
#print '[+%04X] Close Session OK'%(i)
i += 1
sleep (0.5)
else:
#print '[-%04X] Close Session fail: Wait for natural timeout (60+/-3s)'%(i)
sleep(65)
except Exception as e:
exc_type, exc_obj, exc_tb = sys.exc_info()
fname = os.path.split(exc_tb.tb_frame.f_code.co_filename)[1]
print (exc_type, fname, exc_tb.tb_lineno)
session_ids = session_ids[:0xFF]
#get the first incremental diff
const_diff = None
for i in xrange(1, len(session_ids)):
if session_ids[i-1] < session_ids[i]:
const_diff = session_ids[i] - session_ids[i-1]
break
#check if session_ids are increasing at a fixed value
vulnerable = True
crossed_value_boundary = 0
for i in xrange(1, len(session_ids)):
if session_ids[i]-session_ids[i-1] != const_diff:
if crossed_value_boundary < 2:
crossed_value_boundary += 1
else:
vulnerable = False
if vulnerable:
print "Conclusion: BMC is vulnerable to CVE-2014-8272"
else:
print "Conclusion: BMC is not vulnerable to CVE-2014-8272"
if __name__ == "__main__":
main()
