Remote command execution in Ruby Gem Command Wrap
3/15/2013
http://rubygems.org/gems/command_wrap
Commands executed if the remote URL or filename contains the shell character ';'. The commands will be executed as the client user if tricked into using the malicious URL or filename.
Examining the following lines:
command_wrap.rb-7- def self.capture (url, target)
command_wrap.rb-72- command = CommandWrap::Config::Xvfb.command(File.dirname(FILE) + "/…/bin/wkhtmltopdf --quiet --print-media-type #{source} #{params} #{target}") command_wrap.rb-73-
command_wrap.rb:74: `#{command}`
Untrusted data is passed to the command line.
Larry W. Cashdollar
@_larry0
http://vapid.dhs.org/advisories/command-wrap-remoteexec.html