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Ruby Gem Minimagic Command Execution

Ruby Gem Minimagic Command Execution
Posted Mar 13, 2013
Authored by Larry W. Cashdollar

Ruby Gem MiniMagic suffers from a remote command execution vulnerability due to a lack of user input sanitization.

tags | exploit, remote, code execution, ruby
SHA-256 | f3b4827a94b047303ccc02b88c3f74c2860bb4df87e899281dfb759760495123

Ruby Gem Minimagic Command Execution

Change Mirror Download
MiniMagic ruby gem remote code execution 

3/12/2013

https://github.com/hcatlin/mini_magick

A ruby wrapper for ImageMagick or GraphicsMagick command line.

Tested on both Ruby 1.9.2 and Ruby 1.8.7.

If a URL is from an untrusted source, commands can be injected into it for remote code execution with the ; character.

image = MiniMagick::Image.open(remoteurl) image.resize "5x5"
image.format "gif"
image.write "localcopy.gif"

./hcatlin-mini_magick-1.3.1/lib/mini_magick.rb

Lines

172 command = "#{MiniMagick.processor} #{command} {args.join(' ')}".strip 173

174 if ::MiniMagick.use_subexec
175 sub = Subexec.run(command, :timeout => MiniMagick.timeout)
176 exit_status = sub.exitstatus
177 output = sub.output
178 else
179 output = `{command} 2>&1`
180 exit_status = $?.exitstatus
181 end

The .strip will only remove whitespace from the beginning and end of the command.

Larry W. Cashdollar
@_larry0
http://vapid.dhs.org
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