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Wednesday, 08 November 2017 05:24

Flaw in Brother printers allows DoS attack

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Security company Trustwave says it has found a flaw in the web server used by Brother printers which could lead to a denial of service.

The printers in question use the Debut embedded http server to host their Web interfaces and are network-connected business and consumer multifunction devices.

An advisory from Trustwave said that the Debut server had a flaw whereby a single malformed HTTP request could cause the printer in question to hang, with an eventual HTTP 500 error message being returned.

Printing jobs were blocked and the Web interface became unavailable as a result.

It said an attacker could keep sending the same request to put the printer out of commission.

Trustwave said it had tried to contact Brother about this issue many times but the company did not appear to have made a patch available.

"In order to mitigate this issue, admins are left to their own devices. Strict access control is in order here and using a firewall or similar device to restrict Web access to only those admins that need it will help to mitigate the threat here," the company said.

It said it had found a little more than 16,000 vulnerable devices accessible from the Internet.

Trustwave has released proof-of-concept code for exploiting the flaw.

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Sam Varghese

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Sam Varghese has been writing for iTWire since 2006, a year after the site came into existence. For nearly a decade thereafter, he wrote mostly about free and open source software, based on his own use of this genre of software. Since May 2016, he has been writing across many areas of technology. He has been a journalist for nearly 40 years in India (Indian Express and Deccan Herald), the UAE (Khaleej Times) and Australia (Daily Commercial News (now defunct) and The Age). His personal blog is titled Irregular Expression.

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