From: thepipeline_xyz
While text message (SMS) codes are a common method for MultiFactor Authentication (MFA), they are considered a dangerous method due to significant vectors for compromise [00:00:56]. Although simple and easy to use, allowing for quick logins [00:00:48], this method significantly increases the risk of unauthorized access [00:01:06].
How Text Message Codes Work
Typically, when signing into an account, such as a bank account, after entering a password, a code is sent via text message to a linked phone number [00:00:43]. This code is then entered to verify the user’s identity [00:00:46].
Primary Risks
The primary risk stems from the ease with which bad actors can gain access to these codes [00:00:59]:
- SIM Swaps A SIM swap involves an attacker convincing a mobile carrier to transfer a victim’s phone number to a SIM card they control [00:01:05]. Once the attacker has control of the phone number, they can receive all text messages, including MFA codes, enabling them to bypass security measures for various accounts [00:01:01].
- Direct Phone Access If an attacker gains direct physical or remote access to a user’s phone, they can intercept incoming text message codes [00:01:05].
Consequences of Compromise
When an attacker gains consistent access to these codes, the vectors of compromise increase exponentially [00:01:06]. This can lead to severe consequences, such as an individual having their entire life or all their money taken away [00:01:09].
CAUTION
Using text message codes as a form of authentication is a “very dangerous method” because the vectors for compromise can “increase exponentially” through methods like a SIM swap or direct phone access [00:00:56].
For enhanced security, it is recommended to avoid using text message codes and instead opt for more secure MFA methods like biometric verification (e.g., Face ID), hardware keys, or dedicated authenticator apps [00:00:15]. These alternatives offer a higher level of protection against social engineering attacks and unauthorized access.