How to Prevent Credential Stuffing Attacks: 5 Strategies for 2024

Credential stuffing is one of the most dangerous cybersecurity threats, because it is subtle. Unlike credential cracking, a credential stuffing attack doesn’t try to brute-force its way into your corporate or user accounts. Instead, malicious actors use the vast amount of compromised usernames and passwords available online to log in. They do so with automated, sophisticated techniques that make it more challenging than ever for a business to protect its users and data. What looks like a login could be a breach.

This article will uncover five effective strategies to fortify your defenses against these relentless attacks in 2023 and moving into 2024. First, we will talk about the risks of credential stuffing, then we’ll dive into the strategies, after which we’ll discuss where credential stuffing prevention software fits into the picture, and how you can build a company culture resilient against credential stuffing attacks.

Never Underestimate the Risks of Credential Stuffing

Many people reuse passwords across multiple online accounts—which makes credential stuffing attacks so popular among malicious actors. If a business doesn’t properly protect itself, it’s not difficult for a fraudster to log into someone else’s account (account takeover) and steal or use their data for fraudulent purposes. Consequences include:

• Personal financial loss: Hackers who gain entry into someone else’s account can make unauthorized transactions with their credit cards or steal money from their bank accounts or digital wallets. This is scary and frustrating for the affected user, and it will lead to a loss of trust and chargeback costs for the affected business.
• Identity theft: Hackers use people’s personal information to apply for loans or credit applications, or to create fake IDs or passports. This affects people’s credit scores and can quickly become an administrative and financial headache.
• Business disruptions: Hackers who manage to break into a corporate account may gain access to a vast amount of sensitive corporate data. They can leak proprietary information or intellectual property that will at the very least be embarrassing, at the worst extremely damaging to your reputation and revenues.
• Reputational damage: Regardless of how a credential stuffing attack happens, if a hacker manages to break into a user or corporate account, it will be hard for anyone to trust you with their sensitive data again. People may not want to create accounts with you anymore, especially if the attack leads to negative publicity and media coverage.
• Legal ramifications: Not only do you risk lawsuits from affected parties if you lose their sensitive data, but you’re likely under the purview of data protection frameworks like GDPR, CCPA, or, if you’re responsible for people’s healthcare data, HIPAA. Each of these frameworks have strict data privacy rules that, when broken, come with heavy fines and penalties. For example, in the case of GDPR, you can be fined up to 4% of your global turnover.

5 Effective Credential Stuffing Prevention Methods

1. Multi-Factor Authentication (MFA)

MFA requires users to provide another form of identification before gaining account access. This makes password attacks ineffective because hackers who know a user’s password would now also need to know, for example, the answer to an additional security question or the code from a text or email the user received. Even better is biometric MFA, which uses fingerprints or facial recognition.

Every business should look to use platforms that support MFA. All corporate accounts should have MFA enabled and all users should be given the option to enable MFA. Additionally, users should be educated about the importance of enabling MFA. This will significantly reduce the success rate of unauthorized logins and make it extremely hard for hackers to breach into an account with a credential stuffing (or cracking) attack.

Of course, MFA isn’t perfect. Not all users will enable it, because it requires them to take an additional step or have another device with them every time they want to log in. It’s also possible for a hacker to gain access to one of the authentication methods—especially in the case of an SMS, which is easily intercepted.

2. Rate Limiting & Throttling

Rate limiting controls the number of requests that a user can send to a server within a specific timeframe. Throttling, meanwhile, controls the total request rate to make sure performance doesn’t worsen because of a sudden increase in requests. Both are important against credential stuffing because hackers don’t do their work manually. They use automated solutions that allow them to target one or multiple accounts with a large number of requests in a very short amount of time.

So an effective method against credential stuffing is to set up server-side scripts or security solutions that monitor and restrict the request rate. Alternatively, you can implement progressive delays for repeated failed login attempts. This will drastically reduce the success rate of credential stuffing attacks while also protecting your server resources and making sure everything stays online.

The downside of rate limiting and throttling is that it may, on occasion, block legitimate users who accidentally make multiple failed login attempts. It’s also resource-intensive in the sense that the security solutions that protect you can put an additional load on server resources.

3. CAPTCHA & Challenge-Response Tests

We’re all familiar with CAPTCHAs. They require users to perform a task that is meant to be easy for humans but hard for bots, like identifying bicycles in a variety of pictures. A CAPTCHA service is easily integrated into your login and sign-up pages. Just make sure you update the CAPTCHA challenge on a regular basis so attackers never manage to adapt.

The benefits of CAPTCHAs are that they efficiently filter out simple bot traffic and are often entirely free. It’s an easy way to increase the overall security of your website. However, many users find CAPTCHAs annoying or difficult to solve, especially for those with certain disabilities. They’re also not difficult to solve for more sophisticated bots. Look for CAPTCHA services that are accessible, and are not standalone solutions—preferably used as part of a larger bot and fraud prevention solution.

4. Password Blocklists & Leaked Credential Monitoring

Password blocklists prevent users from creating or updating accounts with commonly used or compromised passwords. Meanwhile, monitoring services alert users if their credentials appear in known data breaches. Companies can use that information to urge the affected (or all) users to update their passwords. This will increase the password strength across your user base and protect users against past data breaches.

However, this only protects against the weakest and most common passwords. There are plenty of other passwords that aren’t on blocklists that are easy to guess or break. It may also be frustrating for users to have to change passwords every few months because of some data breach they weren’t aware of.

5. Behavior Analysis and Artificial Intelligence (AI)

The most advanced credential stuffing method uses AI to analyze user behavior patterns. Anomalies in the patterns can indicate automated bot activity and a credential stuffing attack (or another type of bot attack). Those anomalies can then be used to block particular requests before they even reach the login or signup pages.

The downside of relying exclusively on behavior analysis and AI is that it’s not perfectly accurate. It will sometimes misidentify legitimate behavior as malicious and vice versa, especially if the model isn’t frequently and properly updated. There are also data privacy concerns because collecting and analyzing user behavior requires clear communication and GDPR or other regulatory compliance.

The Role of Credential Stuffing Prevention Software

When combined, the five above prevention methods form an effective barrier against credential stuffing and cracking. They are important and every business should implement them (where possible) on their websites, mobile apps, and APIs. However, these methods are at their most powerful when they’re combined into a single, coherent system.

Credential stuffing prevention software brings together various defensive mechanisms:

• Behavioral analysis: This feature scrutinizes user behavior to discern between genuine human interactions and automated bot actions, taking swift actions against the latter.
• Rate limiting: This curbs the menace of brute-force attacks by controlling the number of login attempts permitted within a specified period.
• Geofencing: By assessing the origin of login requests, geofencing can deter or raise alerts about attempts from unusual or high-risk locations.
• Heuristic analysis: Using predictive analytics, the software evaluates login patterns and cross-references them with known hacking strategies.
• Continuous threat intelligence: Staying a step ahead, the software constantly updates its defense blueprints to always stay ahead of the latest hacker techniques.

The advantage of such software is that it provides holistic defense instead of a single protection layer. Because it operates in real-time, it allows for immediate action against any attacks. Credential stuffing prevention software also scales as your business does and can integrate seamlessly into your existing tech architecture.

Best Practices for Building a Resilient Security Culture

When you’ve followed the above advice, you’ll have a robust security setup against credential stuffing. However, that doesn’t protect you against social engineering attacks like phishing. Although not automated, it’s another example of credential stuffing. On a daily basis, hackers manipulate employees into giving up their passwords.

So a resilient security culture is important too. Here’s how you can create such a culture:

1. Conduct regular workshops with industry experts: Engaging industry experts for training sessions and workshops introduces the organization to the latest trends, techniques, and defense strategies in cybersecurity. This equips your team with the latest cybersecurity knowledge and cultivates a proactive approach to potential threats.
2. Participate in security conferences and seminars: These platforms provide insights into the latest research, case studies, and technological advancements in security. This also fosters a culture of continuous learning and makes sure employees are updated with the global cybersecurity landscape.
3. Establish collaborative forums: Create internal forums where team members can discuss potential threats, share experiences, and collaborate on solutions. This enhances collective knowledge and promotes a sense of communal responsibility towards security.
4. Collaborative with others: Partner with other organizations and industry coalitions to share threat intelligence actively. This will provide a more comprehensive view of emerging threats and facilitate the early adoption of preventive measures.
5. Regularly update a best practices guide: Collate insights from industry experts, experiences from past incidents, and lessons from peer organizations into a regularly updated guide. This will act as a ready reference for teams, ensuring everyone is aligned with the latest best practices.
6. Encourage feedback and innovation: Welcome suggestions from employees on improving security postures and encourage them to stay updated with the latest in cybersecurity. This harnesses the collective intelligence of the organization and fosters a sense of ownership among employees.

How to Prevent Credential Stuffing Attacks with DataDome

The best protection against credential stuffing stops the bots that hackers rely on. These bots are increasingly indistinguishable from humans, often using similar human-like device fingerprints and IP addresses with good reputations. Stopping them requires advanced bot detection capabilities. With real-time event tracking and behavioral detection, DataDome protects your websites, APIs, and mobile apps from the most sophisticated credential stuffing attacks.

DataDome is compatible with any web infrastructure and works on autopilot: the AI-powered bot detection engine identifies, classifies, and blocks all automated threats in real time. You’ll receive a notification whenever your site is under attack, but you don’t have to do anything.

Our expert threat researchers and data scientists also proactively monitor and mitigate your automated traffic to ensure optimal security and performance at all times. The SOC team is available to investigate any suspicious activity, or analyze mitigated credential stuffing attacks, 24/7.

Ready to finally put an end to credential stuffing? Start your Vulnerability Scan or contact us to request a demo.