Is SMS Multifactor Authentication (MFA) Still Secure?

Multifactor authentication (MFA) is an essential layer of security that requires users to verify their identity through more than one method of authentication—for example, in addition to a password or PIN.

Rather than relying on a single point of entry, MFA adds extra layers of security by requiring additional verification factors. These factors typically include:

• Something You Know. A password or PIN
• Something You Have. A mobile phone, security key, or app-generated code
• Something You Are. Biometric data such as fingerprints, facial recognition, or voice identification

Why MFA Is Essential

A robust cybersecurity strategy depends on layered defenses. MFA significantly reduces the risk of unauthorized access—if one factor (like your password) is compromised, cybercriminals still have to bypass other security layers. In today’s high-risk digital environment, MFA is vital for stopping breaches and safeguarding your sensitive data.

SMS-based MFA works by sending a one-time code via text message to your phone to confirm your identity. While this method is convenient and easy to set up, it is not without significant risks.

SIM Swapping Attacks

SIM swapping, also known as SIM hijacking, occurs when a cybercriminal tricks your mobile carrier into transferring your phone number to a new SIM card under their control. Once they have control of your number, they can intercept the one-time codes meant to secure your accounts.

As you can imagine, the consequences can be severe, leading to unauthorized access to email, bank accounts, and other sensitive services. If your SIM is swapped, the protection provided by SMS MFA becomes completely compromised.

Phishing Attacks

Hackers are constantly sharpening their tactics, and SMS phishing, aka “smishing,” is a prime example. Here, cybercriminals use social engineering to trick you into providing their one-time codes or personal information via deceptive text messages.

Even if you have MFA enabled, if you inadvertently share your code on a fraudulent site, your accounts can be breached.

Reliance on Phone Carriers and Cellular Networks

SMS-based MFA is dependent on the security and reliability of mobile networks. Outages, delays, service disruptions, and cyberattacks can render SMS-based authentication useless. Having a dependency on a third-party carrier introduces an additional point of failure in your cybersecurity strategy that can be exploited.

A recent Forbes article highlighted a sophisticated phishing kit known as “Astaroth.” This kit employs a man-in-the-middle attack to intercept login credentials, MFA tokens, and session cookies in real-time. By relaying data between the victim and the legitimate website, attackers can capture both primary credentials and the accompanying one-time codes almost instantly.

Even with advanced MFA systems in place, if you get tricked into entering your codes on malicious sites, the additional security layer can be entirely bypassed. This example underscores that relying solely on SMS or even more advanced MFA can be risky if not implemented alongside other robust security measures.

Given the vulnerabilities of SMS-based MFA, let’s explore some more secure alternatives that offer advanced protection against modern threats.

App-Based MFA

Authentication applications, such as Google or Microsoft Authenticator, generate time-sensitive codes on your smartphone or verified push messages that validate a displayed code when you log in. Because these codes are generated offline and are not transmitted over potentially insecure networks, app-based MFA is significantly more resistant to SIM swapping and interception attacks.

Many businesses have found that switching to app-based solutions not only improves security but also enhances the user experience.

Hardware Security Keys

Hardware security keys, like YubiKey or Titan, are physical devices that use FIDO2/WebAuthn standards to provide an additional layer of security.

Hardware security keys are gaining popularity for a couple of reasons. First, they have a strong resistance to phishing—since the key must be physically present, it’s much harder for attackers to intercept or replicate the authentication process. Secondly, the keys are compact, easy to carry, and simple to use.

However, there are costs associated with hardware security keys. Organizations need to invest in the devices, manage distribution, and train employees on proper key management.

Biometric Authentication

Biometric authentication methods use unique physical characteristics such as fingerprints, facial recognition, or voice patterns to verify identity. These systems offer high convenience and are generally user-friendly.

There are some concerns with biometric authentication—collecting and storing biometric data can raise privacy concerns if not managed correctly. Additionally, biometric systems may sometimes face issues with accuracy or compatibility.

1. Conduct a Cybersecurity Risk Assessment

A cybersecurity risk assessment evaluates your organization’s current authentication methods. It also helps identify areas of vulnerability and prioritize improvements.

During this process, an expert can help you determine where to implement MFA correctly to better secure your business.

2. User Education and Training

Security Awareness Training (SAT) is critical for organizations when investing in cybersecurity. Even the most sophisticated security measures can be undermined by human error.

Be sure to conduct regular training on phishing, social engineering, and MFA best practices. You can also implement ongoing awareness programs and simulated phishing campaigns. Showing employees the importance of using MFA wherever possible by example can be beneficial to your company’s cybersecurity posture.

3. Multilayered Cybersecurity

A multilayered cybersecurity strategy is essential to building a resilient defense system. MFA should not operate in isolation; instead, it must be integrated with other cybersecurity measures such as cloud security monitoring and response, firewalls, endpoint protection, and Security Information and Event Management (SIEM) systems.

High Touch Technologies excels in creating a cohesive security ecosystem where each layer reinforces the others. This integrated approach not only defends against sophisticated cyber threats but also provides a robust framework that can adapt to emerging risks, ensuring comprehensive protection across all facets of your IT infrastructure.

4. Policy and Compliance Considerations

When it comes to MFA, you need to adhere to regulatory requirements, especially in industries like finance and health care. Maintaining detailed audit trails and thorough documentation helps ensure that your security protocols meet all regulatory requirements and facilitates smoother IT audits. At High Touch Technologies, we assist in developing and enforcing policies that balance operational efficiency with compliance, ensuring that your authentication systems are not only effective but also meet the highest industry standards.

At High Touch Technologies, we bring over 40 years of expertise in providing robust cybersecurity solutions tailored to small and medium-sized businesses. Our comprehensive approach includes:

• Risk Assessments. We evaluate your current authentication protocols and identify vulnerabilities before they become threats.
• Security Awareness Training (SAT). Our training programs are designed to educate your staff on recognizing phishing attempts and other social engineering tactics.
• Cybersecurity Solutions. We can tailor cybersecurity solutions to meet the unique needs of your business. From securing your network to protecting sensitive data, we employ the latest technologies and strategies to help safeguard every facet of your digital operations.
• Managed IT Services. Benefit from our managed IT services that not only enhance your cybersecurity posture but also optimize technology spending, ensuring every dollar works harder for your business.

We understand that implementing advanced authentication protocols can be complex. That’s why our team is dedicated to providing ongoing support—from initial setup to continuous monitoring—ensuring your business stays ahead of cyberthreats.

At High Touch Technologies, we bring over 40 years of expertise in providing robust cybersecurity solutions tailored to small and medium-sized businesses. Our comprehensive approach includes:

• Risk Assessments. We evaluate your current authentication protocols and identify vulnerabilities before they become threats.
• Security Awareness Training (SAT). Our training programs are designed to educate your staff on recognizing phishing attempts and other social engineering tactics.
• Cybersecurity Solutions. We can tailor cybersecurity solutions to meet the unique needs of your business. From securing your network to protecting sensitive data, we employ the latest technologies and strategies to help safeguard every facet of your digital operations.
• Managed IT Services. Benefit from our managed IT services that not only enhance your cybersecurity posture but also optimize technology spending, ensuring every dollar works harder for your business.

We understand that implementing advanced authentication protocols can be complex. That’s why our team is dedicated to providing ongoing support—from initial setup to continuous monitoring—ensuring your business stays ahead of cyberthreats.