![]() The core issue with SMS security code phishing is that there was no way to bind the sender of the SMS to the site where it should be used. It is not substantially better or worse than manual entry from a phishing perspective. Heuristics are used to assume that if a text is received and it looks like a security code, the user probably wants that code filled into an input box in the active window on their device. Security code autofill more or less just automated step 4, where the user manually entered the SMS code into. The attacker enters the code themselves and is now logged in to as the user. This person, not realizing they are on a malicious site, proceeds to manually enter the code into, ultimately giving the security code to the attacker.They are asked to enter the security code just pushed to their device via SMS: 123456 is your GitHub authentication code.That username and password is sent to, which proceeds to enter those credentials into (a classic person in the middle attack). They enter their username and password.Someone visits that looks a whole lot like.Let’s quickly walk through how such a phishing attack would traditionally occur before SMS autofill. These heuristics left SMS autofill vulnerable to the same kinds of phishing attacks that are used to trick humans. As a result, Apple had to use a number of heuristics to enable autofill. The autofill feature that shipped in iOS 12/macOS Mojave did not use the origin-bound standard. Safari automatically enters the code on the sign in form.They receive an SMS with their security code and are prompted to fill the code.Someone with SMS configured on their GitHub account enters their username/password.This feature is great for user experience: With Text message forwarding enabled, the autofill feature can be used on Safari on macOS Mojave too. PhishingĪpple introduced security code autofill in iOS 12. In addition, the standard defines a format that makes security codes easier for browsers and applications to parse, and removes the need for heuristics to support autofill. It accomplishes this by binding an SMS with the sending site’s origin. This standard ensures security codes are entered in a phishing-resistant manner. We recently shipped support for the origin-bound draft standard for security codes delivered via SMS.
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