https://www.techdirt.com/articles/20...accounts.shtml

from the whoops-a-daisy dept
Mon, Feb 11th 2019 6:26am — Karl Bode

Back in 2017, you might recall how hackers and security researchers highlighted long-standing vulnerabilities in Signaling System 7 (SS7, or Common Channel Signalling System 7 in the US), a series of protocols first built in 1975 to help connect phone carriers around the world. While the problem isn't new, a 2016 60 minutes report brought wider attention to the fact that the flaw can allow a hacker to track user location, dodge encryption, and even record private conversations. All while the intrusion looks like ordinary carrier to carrier chatter among a sea of other, "privileged peering relationships."

Telecom lobbyists have routinely tried to downplay the flaw after carriers have failed to do enough to stop hackers from exploiting it. In Canada for example, the CBC recently noted how Bell and Rogers weren't even willing to talk about the flaw after the news outlet published an investigation showing how, using only the number of his mobile phone, it was possible to intercept the calls and movements of Quebec NDP MP Matthew Dubé.

But while major telecom carriers try to downplay the scale of the problem, news reports keep indicating how the flaw is abused far more widely than previously believed. This Motherboard investigation by Joseph Cox, for example, showed how, while the attacks were originally only surmised to be within the reach of intelligence operators (perhaps part of the reason intelligence-tied telcos have been so slow to address the issue), hackers have increasingly been using the flaw to siphon money out of targets' bank accounts, thus far predominately in Europe:

"In the case of stealing money from bank accounts, a hacker would typically first need a target’s online banking username and password. Perhaps they could obtain this by phishing the target. Then, once logged in, the bank may ask for confirmation of the transfer by sending the account owner a verification code in a text message. With SS7, the hackers can intercept this text and enter it themselves. Exploiting SS7 in this way is a way to circumvent the protections of two-factor authentication, where a system not only requires a password, but something else too, such as an extra code."

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Full article at link.