Unintended Data Leakage holds 4th position at OWASP Mobile Top 10
As the name suggest “Unintended Data Leakage” means when developer of the application accidently leaks the data. Well any developer would never want to leak the data but in some scenarios he assumes that the particular data is only accessible to the application not to any adversary. Below are some of the example scenarios.
adversary who has physical access to device
Often Developers leave debugging information publicly. So any application with READ_LOGS permission can access those logs and can gain sensitive information throught that.
If will use Sieve Application to demonstrate this issue.
- Type pidcat com.mwr.example.sieve in Appie. Pidcat is a modified version of logcat with better viewing of logs.
- Now open up Sieve Application and enter your password.
- Now you will notice that your password is seen in pidcat when you entered it in Sieve. As in the picture below , my password is displayed which is 1234567890123456
Copy/Paste Buffer Caching
Android provides clipboard-based framework to provide copy-paste function in android applications. But this creates serious issue when some other application can access the clipboard which contain some sensitive data.
How To Fix
Disable copy/paste function for sensitive part of the application. For example, disable copying credit card details.
If an application crashes during runtime and it saves logs somewhere then those logs can be of help to an attacker especially in cases when android application cannot be reverse engineered.
How To Fix
Avoid creating logs when applications crashes and if logs are sent over the network then ensure that they are sent over an SSL channel.
Analytics Data Sent To 3rd Parties
Most of the application uses other services in their application like Google Adsense but sometimes they leak some sensitive data or the data which is not required to sent to that service. This may happen because of the developer not implementing feature properly.
You can look by intercepting the traffic of the application and see whether any sensitive data is sent to 3rd parties or not.