Citing a report from the Motherboard, major US carriers including Verizon, T-Mobile, and AT&T have adjusted the routing of text messages, mainly to avoid a loophole that allows hackers to reroute text messages.
Motherboard pointed out in a report last week that this type of attack on SMS messages is mainly aimed at corporate SMS management services, which silently redirect victims’ SMS messages to hackers so that they can access any two-factor codes sent via SMS or log in.
The site paid a hacker $16 to redirect text messages using a tool from a company called Sakari, which helped the company conduct large-scale marketing. Sakari provided a text message redirection tool called Bandwidth, which was provided by another company called NetNumber.
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The result was a chaotic corporate network and a loophole that opened text messages to hackers. Hackers hired by Motherboard were able to access Sakari’s tools without any certification or the consent of the redirected target and successfully obtained text messages from Motherboard’s test phone.
Aerialink, a communications company that helps SMS routing, said today that wireless operators no longer support the activation of SMS or MMS on wireless numbers. This matter “affects all SMS providers in the mobile ecosystem.” This will make the hacker attack demonstrated by Motherboard last week ineffective.
It is unclear whether this method of SMS diversion is widely used by hackers, but it is easier to succeed than other smartphone hacking methods such as SIM card exchange. A security research laboratory researcher said that he had not seen this method before, while another researcher said that this method has definitely been used by hackers.
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