The RCS Texting Protocol Is Method Too Simple to Hack



Ask virtually any telephone provider, and so they’ll inform you that the way forward for smartphone options from texting to video calls is a protocol known as Wealthy Communication Companies. Consider RCS because the successor to SMS, a solution to iMessage that may additionally deal with telephone and video calls. Final month, Google introduced it might start rolling RCS out to its Messages app in all US Android telephones. It is easy to think about a near-future the place RCS is the default for a billion individuals or extra. However when safety researchers seemed underneath the hood, they discovered the best way carriers and Google have carried out the protocol creates a basket of worrisome vulnerabilities.

On the Black Hat safety convention in London on Tuesday, German safety consultancy SRLabs demonstrated a set of issues in how RCS is carried out by each telephone carriers and Google in fashionable Android telephones. These implementation flaws, the researchers say, may enable texts and calls to be intercepted, spoofed, or altered at will, in some instances by a hacker merely sitting on the identical Wi-Fi community and utilizing comparatively easy tips. SRLabs beforehand described these flaws at the DeepSec security conference in Vienna last week, and at Black Hat additionally confirmed how these RCS hijacking assaults would work in movies just like the one under:

SRLabs founder Karsten Nohl, a researcher with a observe document of exposing safety flaws in telephony methods, argues that RCS is in some ways no higher than SS7, the decades-old telephone system carriers nonetheless used for calling and texting, which has lengthy been recognized to be susceptible to interception and spoofing assaults. Whereas utilizing end-to-end encrypted internet-based instruments like iMessage and WhatsApp obviates lots of these of SS7 points, Nohl says that flawed implementations of RCS make it not a lot safer than the SMS system it hopes to interchange.

“You’re going to be extra susceptible to hackers as a result of your community determined to activate RCS,” says Nohl. “RCS offers us the potential to learn your textual content messages and hearken to your calls. That is a functionality that we had with SS7, however SS7 is a protocol from the ’80s. Now a few of these points are being reintroduced in a contemporary protocol, and with assist from Google.”

The RCS rollout nonetheless has a methods to go, and can proceed to be a patchwork even with Google’s backing. Some Android producers use proprietary messaging apps because the default somewhat than the inventory Messages app, and most carriers push their very own variations as nicely. The iPhone would not assist it in any respect, and Apple has given no indication that it’ll. However as RCS rolls out extra broadly, its safety points benefit consideration—particularly because it’s these implementations that create the issues within the first place.

The SRLabs movies display a seize bag of various methods to use RCS issues, all of that are attributable to both Google’s or one of many telephone carriers’ flawed implementations. The video above, for example, exhibits that when a telephone has authenticated itself to a provider’s RCS server with its distinctive credentials, the server makes use of the telephone’s IP handle and telephone quantity as a form of identifier going ahead. Meaning an attacker who is aware of the sufferer’s telephone quantity and who’s on the identical Wi-Fi community—anybody from a coworker in the identical company workplace to somebody on the neighboring desk at Starbucks—can doubtlessly use that quantity and IP handle to impersonate them.


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