1
00:00:01,110 --> 00:00:05,330
Challenge 3 Here's what we know.

2
00:00:05,330 --> 00:00:09,350
With the update to the ADCS, the teams have regained control of the satellite.

3
00:00:09,350 --> 00:00:13,350
But we still can't communicate with the payload module or operate the imager.

4
00:00:13,390 --> 00:00:17,990
In addition, the majority of useful commands are not being accepted by the flight software.

5
00:00:17,990 --> 00:00:21,510
We have to ask ourselves, what else did they damage on this satellite?

6
00:00:21,610 --> 00:00:22,630
The challenge?

7
00:00:22,630 --> 00:00:27,190
Teams must restore communication with the payload module so we can get it working again.

8
00:00:27,490 --> 00:00:28,930
Here's how they do it.

9
00:00:28,930 --> 00:00:34,870
The teams find that their initial commands to communicate with the payload module are not being accepted by the flight software.

10
00:00:35,030 --> 00:00:40,330
It's clear that the command and data handling C&DH system is not working appropriately.

11
00:00:40,330 --> 00:00:46,830
In fact, payload commands, and the majority of the other commands, have been disabled in the C&DH system.

12
00:00:47,010 --> 00:00:54,470
It turns out the attacker has modified the C&DH flight software and are now running their own code on board the space vehicle.

13
00:00:54,570 --> 00:01:02,850
The attacker code is rejecting the majority of commands to the satellite including firmware updates, firmware restore, and ADCS commands.

14
00:01:02,850 --> 00:01:08,490
As a result, it is not possible to restore the failsafe image as the restore command has been disabled.

15
00:01:09,210 --> 00:01:15,750
Lucky for the teams, the attacker was sloppy and inadvertently introduced a vulnerability in the new firmware image.

16
00:01:15,750 --> 00:01:23,390
Teams exploit this vulnerability and use it to repair the system and restore the C&DH software back to normal operation.

17
00:01:23,450 --> 00:01:27,790
Once that is complete, they are able to communicate with the payload module once again.