Computing Community Consortium Blog

The goal of the Computing Community Consortium (CCC) is to catalyze the computing research community to debate longer range, more audacious research challenges; to build consensus around research visions; to evolve the most promising visions toward clearly defined initiatives; and to work with the funding organizations to move challenges and visions toward funding initiatives. The purpose of this blog is to provide a more immediate, online mechanism for dissemination of visioning concepts and community discussion/debate about them.


“Millions of Printers Open to Hack Attack”

November 29th, 2011 / in Research News / by Erwin Gianchandani

This time-lapsed image of a screen on an HP LaserJet shows the impact of a rogue print job used to reprogram the device [image courtesy Columbia University via msnbc.com].An interesting computer security research result making news this morning — and stirring some controversy — courtesy of msnbc.com:

Could a hacker from half-way around the planet control your printer and give it instructions so frantic that it could eventually catch fire? Or use a hijacked printer as a copy machine for criminals, making it easy to commit identity theft or even take control of entire networks that would otherwise be secure?

 

It’s not only possible, but likely, say researchers at Columbia University, who claim they’ve discovered a new class of computer security flaws that could impact millions of businesses, consumers, and even government agencies [more after the jump…].

 

Printers can be remotely controlled by computer criminals over the Internet, with the potential to steal personal information, attack otherwise secure networks and even cause physical damage, the researchers argue in a vulnerability warning first reported by msnbc.com.  They say there’s no easy fix for the flaw they’ve identified in some Hewlett-Packard LaserJet printer lines — and perhaps on other firms’ printers, too — and there’s no way to tell if hackers have already exploited it.

The researchers, who have working quietly for months in an electronics lab under a series of government and industry grants, described the flaw in a private briefing for federal agencies two weeks ago. They told Hewlett Packard about it last week.

 

HP said Monday that it is still reviewing details of the vulnerability, and is unable to confirm or deny many of the researchers’ claims, but generally disputes the researchers’ characterization of the flaw as widespread.  Keith Moore, chief technologist for HP’s printer division, said the firm “takes this very seriously,” but his initial research suggests the likelihood that the vulnerability can be exploited in the real world is low in most cases.

 

“Until we verify the security issue, it is difficult to comment,” he said, adding that the firm cannot say yet what printer models are impacted.

 

But the Columbia researchers say the security vulnerability is so fundamental that it may impact tens of millions of printers and other hardware that use hard-to-update “firmware” that’s flawed.

 

The flaw involves firmware that runs so-called “embedded systems” such as computer printers, which increasingly are packed with functions that make them operate more like full-fledged computers. They also are commonly connected to the Internet.

 

“The problem is, technology companies aren’t really looking into this corner of the Internet. But we are,” said Columbia professor Salvatore Stolfo, who directed the research in the Computer Science Department of Columbia University’s School of Engineering and Applied Science. “The research on this is crystal clear.  The impact of this is very large. These devices are completely open and available to be exploited.”

 

Columbia researcher Ang Cui explains how he was able to infect an HP printer with malicious code [image courtesy Columbia University via msnbc.com].Printer security flaws have long been theorized, but the Columbia researchers say they’ve discovered the first-ever doorway into millions of printers worldwide.  In one demonstration of an attack based on the flaw, Stolfo and fellow researcher Ang Cui showed how a hijacked computer could be given instructions that would continuously heat up the printer’s fuser — which is designed to dry the ink once it’s applied to paper — eventually causing the paper to turn brown and smoke.

 

In that demonstration, a thermal switch shut the printer down — basically, causing it to self-destruct — before a fire started, but the researchers believe other printers might be used as fire starters, giving computer hackers a dangerous new tool that could allow simple computer code to wreak real-world havoc.

 

Cui and Stolfo say they’ve reverse engineered software that controls common Hewlett-Packard LaserJet printers. Those printers allow firmware upgrades through a process called “Remote Firmware Update.” Every time the printer accepts a job, it checks to see if a software update is included in that job.  But they say printers they examined don’t discriminate the source of the update software — a typical digital signature is not used to verify the upgrade software’s authenticity — so anyone can instruct the printer to erase its operating software and install a booby-trapped version.

 

In all cases, the Columbia researchers claim, duping a would-be target into printing a virus-laden document is enough to take control of that person’s printer; but in some cases, printers are configured to accept print jobs via the Internet, meaning the virus can be installed remotely, without any interaction by the printer’s owner…

 

There are plenty of points of contention between HP and the researchers, however. Moore, the HP executive, said the firm’s newer printers do require digitally signed firmware upgrades, and have since 2009. The printers tested by the researchers are older models, Moore said…

 

Moore also said that the impact of any potential vulnerability is limited because most home users have InkJet printers — not LaserJet printers — and they do not permit remote firmware upgrade, he said…

For more, check out the msnbc.com article in its entirety.

(Contributed by Erwin Gianchandani, CCC Director)

“Millions of Printers Open to Hack Attack”