CVE-2014-3486

First published: Tue Jun 10 2014(Updated: )

Kurt Seifried of Red Hat Product Security reports: ======================================== ./lib/util/MiqSshUtilV1.rb def shell_exec(cmd, doneStr=nil, shell=@shell) if shell # Writing to a temp remote script to handle cases where the cmd string is # too long and is truncated. temp_remote_script = "/var/tmp/miq-#{Time.now.to_i}.sh" self.exec("echo \"#{cmd}\" &gt; #{temp_remote_script}") self.exec("chmod 700 #{temp_remote_script}") out = shell.send_command(temp_remote_script) self.exec("rm -f #{temp_remote_script}") @status = out.status msg = out.stdout # Check if the first output return references the remote script and remove it. msgs = msg.split("\n") msg = msgs[1..-1].join("\n") if msgs[0].include?(temp_remote_script) raise "#{msg}" unless doneStr.nil? || msg.include?(doneStr) return msg else return self.exec(cmd, doneStr) end end ======================================== ./lib/util/MiqSshUtilV2.rb def temp_cmd_file(cmd) temp_remote_script = "/var/tmp/miq-#{Time.now.to_i}.sh" self.exec("echo \"#{cmd}\" &gt; #{temp_remote_script}") remote_cmd = "chmod 700 #{temp_remote_script}; #{temp_remote_script}; rm -f #{temp_remote_script}" yield(remote_cmd) end ======================================== Time.now.to_i = 1412123123 setup a file and a few hundred/thousand symlinks and you can cover an hour easily. Between the self.exec("echo \"#{cmd}\" &gt; #{temp_remote_script}") self.exec("chmod 700 #{temp_remote_script}") an attacker can replace the file, which is then executed as root. It should use Ruby Tempfile: <a href="http://kurt.seifried.org/2012/03/14/creating-temporary-files-securely/">http://kurt.seifried.org/2012/03/14/creating-temporary-files-securely/</a>

Credit: secalert@redhat.com

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