Admin: /* Exec on Cat */

2023-12-02T05:34:11Z

Exec on Cat

← Older revision		Revision as of 05:34, 2 December 2023
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	Well now you might say "interesting but what good is that?" Well with a slight modification we can set a bit of a trap.		Well now you might say "interesting but what good is that?" Well with a slight modification we can set a bit of a trap.

	=== Exec on Cat ===		=== Exec on Cat 👨‍💼/🐱 ===

	* Term 1: Set Tripwire		* Term 1: Set Tripwire

Admin at 03:06, 2 December 2023

2023-12-02T03:06:09Z

← Older revision		Revision as of 03:06, 2 December 2023
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	* Term 1: Set Tripwire		* Term 1: Set Tripwire

	» inotifywait -qqe open fart.txt		» inotifywait -qqe open fart.txt && ./run_hax.sh

	* Term 2: Harmlessly Cat a File		* Term 2: Harmlessly Cat a File

Admin: Created page with "== Inotifywait == === Description === From the [https://linux.die.net/man/1/inotifywait man page].

 NAME        inotifywait, fsnotifywait - wait for changes to files using inotify or fanotify  DESCRIPTION        inotifywait  efficiently waits for changes to files using Linux's inotify(7) interface.  It is        suitable for waiting for changes to files from shell scripts.  It  can  either  exit  once  an        event occurs, or continually execute and output eve..."

2023-12-02T03:04:39Z

Created page with "== Inotifywait == === Description === From the [https://linux.die.net/man/1/inotifywait man page]. <pre> NAME inotifywait, fsnotifywait - wait for changes to files using inotify or fanotify DESCRIPTION inotifywait efficiently waits for changes to files using Linux's inotify(7) interface. It is suitable for waiting for changes to files from shell scripts. It can either exit once an event occurs, or continually execute and output eve..."

New page

== Inotifywait ==

=== Description ===

From the [https://linux.die.net/man/1/inotifywait man page].

<pre>
NAME
inotifywait, fsnotifywait - wait for changes to files using inotify or fanotify

DESCRIPTION
inotifywait efficiently waits for changes to files using Linux's inotify(7) interface. It is
suitable for waiting for changes to files from shell scripts. It can either exit once an
event occurs, or continually execute and output events as they occur.
</pre>

== Examples ==

=== Cat on Write ===

* Term 1: inotifywait listener

» notifywait -qqe close_write fart.txt && cat fart.txt

Args are:

<pre>
-e <event>, --event <event>
Listen for specific event(s) only. The events which can be listened for are listed in
the EVENTS section. This option can be specified more than once. If omitted, all
events are listened for.

-q, --quiet
If specified once, the program will be less verbose. Specifically, it will not state
when it has completed establishing all inotify watches.

If specified twice, the program will output nothing at all, except in the case of fatal
errors.
</pre>

[https://linux.die.net/man/1/inotifywait Man inotifywait]

* Term 2: Write to fart.txt

» echo fart fart fart > fart.txt

* Term 1: fart.txt catt'ed

» notifywait -qqe close_write fart.txt && cat fart.txt
fart fart fart

Well now you might say "interesting but what good is that?" Well with a slight modification we can set a bit of a trap.

=== Exec on Cat ===

* Term 1: Set Tripwire

» inotifywait -qqe open fart.txt

* Term 2: Harmlessly Cat a File
» cat fart.txt

* Term 1: Hax Triggered!
» inotifywait -qqe open fart.txt && ./run_hax.sh
Running Hax...

== Sources ==

https://superuser.com/questions/181517/how-to-execute-a-command-whenever-a-file-changes

https://linux.die.net/man/1/inotifywait

Inotifywait Shenanigans - Revision history

Admin: /* Exec on Cat */

Admin at 03:06, 2 December 2023