How SIM Swapping Can Bypass SMS-Based Two-Factor Authentication

Summary

The article explains how SIM swapping can let attackers intercept SMS authentication codes, and recommends enabling 2FA, avoiding SMS-only authentication when possible, and educating users about MFA.

Key points

• SIM swapping involves persuading a mobile carrier to transfer a victim’s phone number to a new SIM card.
• If an attacker also has the user’s login credentials, they may receive SMS-based authentication codes after a successful SIM swap.
• The article notes that SMS authentication depends on the security of the mobile carrier.
• It recommends enabling 2FA or MFA wherever possible and avoiding SMS-only authentication when alternatives are available.
• Other suggested measures include using unique passwords, leveraging SSO with 2FA, and reminding users not to share authentication tokens.