Title:MiniMagic ruby gem remote code execution
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.