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April 9, 2016 06:00 am

Over 135 Million Routers Vulnerable To Denial-of-service Flaw

schwit1 quotes a report from ZDNet: [More than 135 million modems are said to be vulnerable to a flaw that can leave users cut-off from the internet -- just by someone clicking on a trick link.] The problem lies with how a widely-used router, the ArrisSurfBoard SB6141, handles authentication and cross-site requests. Arris (formerly Motorola) said that it has sold more than 135 million of the SurfBoard SB6141 routers. That means the millions of Comcast, Time Warner Cable, or Charter customers who are shipped one of these routers when they subscribe are vulnerable. The flaw is so easy to exploit that anyone on an affected network can be tricked into clicking on a specially crafted web page or email. Security researcher David Longenecker, who found the flaws and posted the write-up on the Full Disclosure list earlier this week, released the "exploit" link after Arris stopped responding to emails he sent as part of the responsible disclosure process. There's no practical fix for the flaw, according to Longenecker. "The simplest solution would be a firmware update such that the web [user interface] requires a username and password before allowing disruptive actions such as rebooting or resetting the modem, and that validates that a request originated from the application and not from an external source," he said. But even if Arris released a fix, he said that the cable modems are not upgradable by their owners, meaning the internet provider would have to roll out the fix.

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