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CRITICAL BUGS IN CANON SMALL OFFICE PRINTERS ALLOW CODE EXECUTION, DDOS

A grouping of serious printer bugs, unveiled at last summer's Pwn2Own, were
patchless for months, but are finally fixed now.

Nate Nelson, Contributing Writer

February 6, 2024

3 Min Read
Source: Yau Ming Low via Alamy Stock Photo


Canon has patched seven critical buffer-overflow bugs affecting its small office
multifunction printers and laser printers.

Tracked as CVE-2023-6229 through CVE-2023-6234 (plus CVE-2024-0244), they affect
different processes common across Canon's product lines – the username or
password process involved with authenticating mobile devices, for example, the
Service Location Protocol (SLP) attribute request process, and more.

The company assigned them all "critical" 9.8 out of 10 ratings on the Common
Vulnerability Scoring System (CVSS) scale. As explained in a security advisory,
they can allow unauthenticated attackers to remotely perform denial of service
(DoS) or arbitrary code execution against any affected printers connected
directly to the Internet. They also offer a handy pivot point to burrow deeper
into victim networks.



No exploitations have been observed in the wild as of yet, according to the
company's European site, but owners should scan for indicators of compromise
given that the bugs have been publicly known but unpatched for months.




HARD TO HANDLE: THE PROBLEM WITH PRINTER SECURITY

The seven vulnerabilities patched on Feb. 5 were revealed alongside dozens of
others at Pwn2Own Toronto's SOHO Smashup last summer, where contestants were
invited to breach routers and then the small office/home office (SOHO) devices
they connect to.

Printers, so rarely recognized as fertile grounds for cyberattacks, were given
their own category at the event.

"It's a pretty large attack surface right now that's often overlooked,
especially in small businesses, because it's hard to manage from an enterprise
level," explains Dustin Childs, head of threat awareness for Trend Micro's Zero
Day Initiative (ZDI), which runs the Pwn2Own hacking contest. "I mean, it's not
like printers have automatic updates or other features that you can use to
manage them cleanly and easily."



He adds, "printers have always been kind of notorious for being finicky. You can
go back to Office Space — one of the big scenes where they took a baseball bat
to the printer. It's a joke, but it's a joke that's based in reality. These
things are difficult to manage. The drivers are difficult to manage. And there's
a lot of problematic software on them."



As a result, an old office printer — connected to other, more sensitive devices
in a small or midsized business (SMB) network — tends to be rather trivial to
crack.

"I was a little shocked with how little they had to work on it to find really
workable exploits," Childs recalls of Pwn2Own Toronto. As a case in point: "Last
year somebody played the Mario theme on a printer. And he said it took him
longer to figure out how to play the Mario theme than to exploit the printer."


WHAT SMBS CAN DO ABOUT PRINTER SECURITY CHAOS

Beyond the obvious step of updating to the latest firmware, Canon is advising
its customers to "set a private IP address for the products and create a network
environment with a firewall or wired/Wi-Fi router that can restrict network
access."

The advice speaks to a larger point: that even if printers are thick and
unwieldy, what's manageable is their connectivity.

"It used to be that there were, believe it or not, Internet-addressable
printers. What businesses have done is they've gotten printers off the Internet,
which is a change over the last decade. Now we've got them behind at least a
firewall, or router, or something," Childs explains.

However, he adds, "as we've seen with PrintNightmare and other printer-based
exploits, you can get past that firewall and then attack a printer, then pivot
from that to other targets within an enterprise." To prevent a printer
compromise from reaching further into a network, SMBs need to focus on properly
segmenting different areas of their networks.



The best way to protect the printers themselves, meanwhile, is to patch. As
Childs recalls, "I can't tell you how many times I've heard of printers that
were exploited that were three or four updates behind."




ABOUT THE AUTHOR(S)

Nate Nelson, Contributing Writer



Nate Nelson is a freelance writer based in New York City. Formerly a reporter at
Threatpost, he contributes to a number of cybersecurity blogs and podcasts. He
writes "Malicious Life" -- an award-winning Top 20 tech podcast on Apple and
Spotify -- and hosts every other episode, featuring interviews with leading
voices in security. He also co-hosts "The Industrial Security Podcast," the most
popular show in its field.

See more from Nate Nelson, Contributing Writer
Keep up with the latest cybersecurity threats, newly discovered vulnerabilities,
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