Have You Noticed the PII Leakage?

WhiteHat: the more you collect, the higher the risk

Blog Have You Noticed the PII Leakage?

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I want to start with this sentence that Khare gave us days before the webinar (which you can access here) in a blog post (link here): "Mobile app owners and developers are receiving a failing grade on due diligence to protecting consumer data."

There are different means by which information can be collected today to identify a particular individual. People are continually registering for various programs and applications. For this, we are providing a lot of private data that can easily be used by other subjects for multiple purposes.

At Fluid Attacks, we are always attached to a security-oriented context. This time, in this post, we focus on the part of the mobile app security. Cybercriminals see mobile devices as desirable sources of information, especially sensitive information that we store on these devices.

Such sensitive information can also be categorized as personally identifiable information or PII. This information may include the real name, alias, account name, actual address, IP address, email address, social security number, passport, driver’s license number, and some other data.

Each of these data being part of an aggregate can contribute to the identification of a particular individual. The attacker may be able to distinguish the person and perhaps trace it back to committing some fraud, such as identity theft. Many of us innocently believe that what we enter into a specific software is known only to us and no one else.

Much of what we deliver or do in the applications can indeed be shared, sold, or used by third parties for analysis, marketing, and advertising purposes. They may begin to know our interests and preferences and from that make the most appropriate offerings, or improve our experience within the application and deliver a better service.

Business leaders are often not honest about how they are handling and protecting customer data. The information collected can be used in a business from a competitive framework to gain an unfair advantage. Others have gone a little further, and have sought to influence users within political campaigns. Such was the case of Cambridge Analytica, a British political consulting firm, which accessed private data from millions of Facebook users to influence elections.


Image taken from here.

The attackers are always going to be lurking, even when we think we’re safe. The applications that we believe are the most secure, because of their popularity, also come to mean high risks for the privacy of our information. Cervantes and Khare told us, concerning data breaches and data sharing, and from one of their recent company reports:

  • 70% of the 350 popular Android apps leak sensitive personal data.”

  • 82% of retail apps leaked sensitive data.”

  • 67% of travel apps leaked sensitive data.”

  • 50% of finance and insurance apps leaked sensitive data.”

If we are creators of mobile apps, we must look for the best ways to deal with the possible risk of data breaches, always trying to guarantee the privacy of our users and keep their data safe. One of the biggest risks comes from the simple fact of collecting too much information from the users of our applications. From there, the risk increases because of the ways of sharing, and in itself the traffic that this information has.

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It is then indicated as recommended for risk reduction with user data and to prevent mobile app security intrusions, the following:

On the one hand, it has to be defined what information is required; what information is needed for the application. Distinguish which of it is part of the sensitive data or PII. Within the GDPR (General Data Protection Regulation), privacy by design is an essential requirement, so the applications we develop must maintain, process, and share with external sources the necessary user data. But what information is classified as necessary, and who defines that? —That’s something to consider carefully.

On the other hand, it is crucial to establish how long it is necessary (this concept again) to store the data and in which places this storage will be done. Certainly, data encryption can always be a useful tool (although some know how to decrypt). However, it is recommended that sensitive data is transmitted and displayed but does not persist in the memories; that closing the application means the disappearance of that information.

With the transit and hosting of information through the networks, appropriate validation and certification processes must be ensured. Also, the background of the third-party providers on how they handle the data collected must be known.

It remains ideal that the data is stored in a secure system. Here we rely heavily on the developers and their knowledge of secure coding practices. These practices should be in place prior to the design and development of software. The central idea is to make the code little or not vulnerable at all. However, always bearing in mind that everything generated can be hacked. Hence the need to maintain a constant evaluation of the system, even in the middle of development.

We come back to something that is continuously repeated in the area of cybersecurity. In essence, sometimes the developers don't know, or sometimes they don't pay attention to it and the subsequent risks, and they are not building secure code when creating software. Sometimes they don’t even know how or don't have the tools to address a vulnerability before it becomes a problem. Besides, enterprise managers may request application development for quick commitment to their customers without fully considering the value of cybersecurity assessment and implementation.

Is your company prepared for the implications that an application security breach may have? Always keep mobile application security testing as an option, so that the application in question is attacked, and vulnerabilities that give access to external people or systems to the private information of the mobile application user are identified. Again, this is something to be done periodically, as part of an effective vulnerability management strategy. At least it is what we recommend.

It would indeed be prudent to stop collecting so much information to reduce the risks. How willing would application developers be to do this? Leaving that extraordinary possibility aside, we recommend keeping as a priority the proper securing of other people’s information on any kind of system.

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