Yesterday it was reported that both TalkTalk and Post Office broadband customers have had their online access cut by an attack targeting certain types of internet routers. A spokeswoman for the Post Office told the BBC that the problem began on Sunday and had affected about 100,000 of its customers. Talk Talk also confirmed that some of its customers had been affected, and it was working on a fix. It is not yet known who is responsible for the attack. (It would also appear that local telco KCOM in Hull suffered similar problems last Saturday.)
In the light of these developments, Andy Green, a senior technical specialist at Varonis, comments: The lessons that should be learned from these ongoing Mirai attacks is just how vulnerable we were as a result of our own IT laziness. Sure, we can excuse harried consumers for treating their home routers and IoT gadgetry like toasters and other kitchen appliances – just plug it in and forget about it. So what excuse do professional IT types have for this rookie-level behaviour?
Not much! Unfortunately, default-itis still plagues large organisations. As long ago as 2014, the Verizon DBIR specifically noted that for POS-based attacks, the hackers typically scanned for public ports and then guessed for weak passwords on the PoS server or device – either ones that were never changed or were created for convenience, “admin1234”. This is exactly the technique used in the Mirai botnet attack against the IoT cameras.
Even if hackers use other methods to get inside a corporate network (phishing, most likely) they can still take advantage of internal enterprise software in which defaults accounts were never changed. For those organisations who think that the Mirai botnet incident has nothing to with them, or have to convince their board of this, here are two points to consider.
1. The lesson of the Mirai botnet attack is that the perimeter will always have leaks. For argument’s sake, even if you overlook phishing scenarios, there will continue to be vulnerabilities and holes in routers, network devices, and other core infrastructure that allow hackers to get inside.
2. Human nature tells us that IT will also continue to experience default-itis. Enterprise software is complicated. IT is often under pressure to quickly get apps and systems to work. As a result, default accounts and weak passwords that were set for reasons of convenience – thinking that users will change the passwords later – will always be an issue for organisations.
You have to plan for attackers breaching the first line of defences, and therefore have in place security controls to monitor and detect intruders. In a way, we should be thankful for the “script kiddies” who launched the Mirai botnet DDoS attack: it’s a great lesson for showing that companies should be looking inward, not at the perimeter, in planning their data security and risk mitigation programs.
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