Menu
Hacker hijacks thousands of publicly exposed printers to warn owners

Hacker hijacks thousands of publicly exposed printers to warn owners

The printers were forced to print rogue messages that claimed they were now part of a botnet

Following recent research that showed many printer models are vulnerable to attacks, a hacker decided to prove the point and forced thousands of publicly exposed printers to spew out rogue messages.

The messages included ASCII art depicting robots and warned that the printers had been compromised and they were part of a botnet. The hacker, who uses the online alias Stackoverflowin, later said that the botnet claim was not true and that his efforts served only to raise awareness about the risks of leaving printers exposed to the internet.

Stackoverflowin claims to be a high-school student from the U.K. who is interested in security research. He said that for the most part he simply sent print jobs using the Line Printer Daemon (LPD), the Internet Printing Protocol (IPP) and the RAW protocol on communications port 9100 to printers that didn't require authentication.

However, he also claims to have exploited an undisclosed remote command execution (RCE) vulnerability in the web management interface of Xerox printers.

The hacker estimates that up to 150,000 printers were affected by his effort, but claims to have access to more RCE flaws that he didn't use and which would have allowed him to print to over 300,000 printers.

As printers around the world started printing the hacker's rogue messages on Friday, affected users took to Twitter to report the problem. From the photos they posted, it appears that many of the printers were part of point-of-sale systems.

The issue of publicly exposed printers is not new and has been exploited before to print rogue and sometimes offensive messages. However, the issue was renewed last week when researchers from Ruhr-University Bochum in Germany published a paper on different attacks against network printers and an assessment of 20 printer models. The researchers also released a Printer Exploitation Toolkit and published a printer hacking wiki.

Users should make sure that their printers can't be accessed through a public Internet Protocol address at all, Stackoverflowin said. However, if they need to do this, they should enforce access rules in their routers and only whitelist certain IP addresses, or set up a virtual private network, he said.


Follow Us

Join the newsletter!

Or

Sign up to gain exclusive access to email subscriptions, event invitations, competitions, giveaways, and much more.

Membership is free, and your security and privacy remain protected. View our privacy policy before signing up.

Error: Please check your email address.

Tags Printers

Events

Why experience is the new battleground for partners

Join us for an exclusive webinar, in association with Hewlett Packard Enterprise and Technology Services Industry Association (TSIA) and learn about the latest industry insights and how technology services continue to evolve to deliver differentiated value, and how partners can be successful in 2021 and beyond.

Featured

Slideshows

The Kiwi channel gathers for the 2020 Reseller News Women in ICT Awards

The Kiwi channel gathers for the 2020 Reseller News Women in ICT Awards

Hundreds of leaders from the New Zealand IT industry gathered at the Hilton in Auckland on 17 November to celebrate the finest female talent in the Kiwi channel and recognise the winners of the Reseller News Women in ICT Awards (WIICTA) 2020.

The Kiwi channel gathers for the 2020 Reseller News Women in ICT Awards
Leading female front runners honoured at the 2020 Reseller News Women in ICT Awards

Leading female front runners honoured at the 2020 Reseller News Women in ICT Awards

The leading female front runners of the New Zealand ICT industry joined together for the annual Reseller News Women in ICT Awards event at the Hilton in Auckland, during which hundreds of guests celebrated 13 outstanding individuals who won awards, chosen from more than 50 finalists representing over 30 organisations.

Leading female front runners honoured at the 2020 Reseller News Women in ICT Awards
Channel gathers to celebrate the Reseller News Innovation Awards 2020 winners

Channel gathers to celebrate the Reseller News Innovation Awards 2020 winners

More than 500 channel leaders gathered in Auckland on 21 October at the ​Reseller News Innovation Awards ​2020 to celebrate the achievements of the New Zealand technology industry's top partners, start-ups, vendors, distributors and individuals.

Channel gathers to celebrate the Reseller News Innovation Awards 2020 winners
Show Comments