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Insertion of Sensitive Information into Log File


Severity Medium
Score 4.9/10


The react-native-mmkv is a library that allows easy use of MMKV inside React Native applications. In versions 1.3.0 through 2.10.2, the react-native-mmkv logged the optional encryption key for the MMKV database into the Android system log. The key can be obtained by anyone with access to the Android Debugging Bridge (ADB) if it is enabled in the phone settings. This bug is not present on iOS devices. By logging the encryption secret to the system logs, attackers can trivially recover the secret by enabling ADB and undermining an app's thread model.

  • LOW
  • NONE
  • NONE
  • HIGH
  • HIGH
  • NONE

CWE-532 - Insertion of Sensitive Information into Log File

It's quite common for applications to save logs. For example, whenever a user requests a resource from a particular website, the web server writes information about the request to a log file. These files are helpful for identifying abnormal system activity, bugs, and evaluating the security controls of the application. Security of log files is critical for the overall security of the application and its confidential resources. An application that lacks appropriate logging levels can expose sensitive user data and system information stored on the log files to malicious users. This info can be exploited to compromise your system.

Advisory Timeline

  • Published