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.

run-mailcap --action=view /etc/hosts
!/bin/sh

File write

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

The file must exist and be not empty.

This invokes the default editor, which is likely to be vi, other functions may apply.

run-mailcap --action=edit file_to_read

File read

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

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

run-mailcap --action=view file_to_read

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 run-mailcap --action=view /etc/hosts
!/bin/sh