Prime Minister's Office News Feed: 26/08/20

WHO IS ETHICAL HACKER

Who is hacker?
A hacker is a Creative person and a creative Programmer,who have knowledge about Networking,Operating system,hacking & a best creative social engineer who control anyone's mind he is also a knowledgeable person.

Hacker are the problem solver and tool builder.

OR

A hacker is an individual who uses computer, networking and other skills to overcome a technical problem but it often refers to a person who uses his or her abilities to gain unauthorized access to system or networks in order to commit crimes.

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New Printers Vulnerable To Old Languages

When we published our research on network printer security at the beginning of the year, one major point of criticism was that the tested printers models had been quite old. This is a legitimate argument. Most of the evaluated devices had been in use at our university for years and one may raise the question if new printers share the same weaknesses.

35 year old bugs features

The key point here is that we exploited PostScript and PJL interpreters. Both printer languages are ancient, de-facto standards and still supported by almost any laser printer out there. And as it seems, they are not going to disappear anytime soon. Recently, we got the chance to test a $2,799 HP PageWide Color Flow MFP 586 brand-new high-end printer. Like its various predecessors, the device was vulnerable to the following attacks:

Capture print jobs of other users if they used PostScript as a printer driver; This is done by first infecting the device with PostScript code
Manipulate printouts of other users (overlay graphics, introduce misspellings, etc.) by infecting the device with PostScript malware
List, read from and write to files on the printers file system with PostScript as well as PJL functions; limited to certain directories
Recover passwords for PostScript and PJL credentials; This is not an attack per se but the implementation makes brute-force rather easy
Launch denial of Service attacks of various kinds:
- PostScript based infinite loops
- PostScript showpage redefinition
- Disable jobmedia with proprietary PJL
- Set the device to offline mode with PJL

Now exploitable from the web

All attacks can be carried out by anyone who can print, which includes:

Web attacker:
- A malicious website that uses XSP
Network access:
- Via Jetdirect (port 9100/tcp)
- Via LPD (port 515/tcp)
- Via IPP (port 631/tcp)
Wireless access:
- Apple Air Print (enabled by default)
Cloud access:
- Google Cloud Print (disabled by default)
Physical access:
- Printing via USB cable or USB drive
- Potentially NFC printing (haven't tested)

Note that the product was tested in the default configuration. To be fair, one has to say that the HP PageWide Color Flow MFP 586 allows strong, Kerberos based user authentication. The permission to print, and therefore to attack the device, can be be limited to certain employees, if configured correctly. The attacks can be easily reproduced using our PRET software. We informed HP's Software Security Response Team (SSRT) in February.

Conclusion: Christian Slater is right

PostScript and PJL based security weaknesses have been present in laser printers for decades. Both languages make no clear distinction between page description and printer control functionality. Using the very same channel for data (to be printed) and code (to control the device) makes printers insecure by design. Manufacturers however are hard to blame. When the languages were invented, printers used to be connected to a computer's parallel or serial port. No one probably thought about taking over a printer from the web (actually the WWW did not even exist, when PostScript was invented back in 1982). So, what to do? Cutting support for established and reliable languages like PostScript from one day to the next would break compatibility with existing printer drivers. As long as we have legacy languages, we need workarounds to mitigate the risks. Otherwise, "The Wolf" like scenarios can get very real in your office…

Takeover - SubDomain TakeOver Vulnerability Scanner

Sub-domain takeover vulnerability occur when a sub-domain (subdomain.example.com) is pointing to a service (e.g: GitHub, AWS/S3,..) that has been removed or deleted. This allows an attacker to set up a page on the service that was being used and point their page to that sub-domain. For example, if subdomain.example.com was pointing to a GitHub page and the user decided to delete their GitHub page, an attacker can now create a GitHub page, add a CNAME file containing subdomain.example.com, and claim subdomain.example.com. For more information: here

Installation:

# git clone https://github.com/m4ll0k/takeover.git
# cd takeover
# python takeover.py

or:

wget -q https://raw.githubusercontent.com/m4ll0k/takeover/master/takeover.py && python takeover.py

Download Takeover

Prime Minister's Office News Feed

Wednesday, August 26, 2020

WHO IS ETHICAL HACKER

More information

New Printers Vulnerable To Old Languages

35 year old bugs features

Now exploitable from the web

Conclusion: Christian Slater is right

Related articles

Takeover - SubDomain TakeOver Vulnerability Scanner

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