A Tale of CenturyLink Backdoors, PCI Compliance, and Pain. Lots of Pain.

I have a client with an ActionTec M1000 modem running firmware QA02.5-3.60.3.0.8.6-M1000. It’s on a business CenturyLink DSL line and routes for five public IP addresses. For ease of writing, I’m going to use 1.1.1.1 through 1.1.1.5 to refer to the IP addresses. The modem itself is assigned the fifth IP address, (.5). The office firewall is assigned the first (.1), the office hybrid VOIP PBX has the second (.2), the website has the third (.3) and the fourth IP address (.4) is unassigned. Simple so far, right?

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