13 August 2018

Compromise a network connected fax machine - and take down a corporate network...


Booby-trapped image data sent by fax can let malicious hackers sneak into corporate networks, security researchers have found.

Since many companies use fax machines that are also printers and photocopiers, they often have a connection to the internal network.

The malicious images exploit protocols established in the 1980s that define the format of fax messages.


The two researchers said millions of companies could be at risk because they currently did little to secure fax lines.

In particular, the researchers found problems with the way the protocols were used in some multi-purpose printers made by HP that are widely used in the business world. HP has now issued a patch for its printers, which will close the loopholes found by the pair.



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