Rule Definition
Insecure data storage vulnerabilities occur when development teams assume that users or malware will not have access to a mobile device's filesystem and subsequent sensitive information in data-stores on the device. If the program does not ensure that the user is only requesting private files, then the user might be able to access other files on the system.

Remediation
Instead of using NSFileProtectionNone or NSURLFileProtectionNone options, please use one of the following option: - NSFileProtectionComplete - NSFileProtectionCompleteUnlessOpen - NSFileProtectionCompleteUntilFirstUserAuthentication - NSURLFileProtectionComplete - NSURLFileProtectionCompleteUnlessOpen - NSURLFileProtectionCompleteUntilFirstUserAuthentication

Violation Code Sample

[[NSFileManager defaultManager] createFileAtPath:PATH contents:someData attributes:@{NSFileProtectionKey:NSFileProtectionNone}];

[[NSFileManager defaultManager] createFileAtPath:PATH contents:someData attributes:@{NSURLFileProtectionKey:NSURLFileProtectionNone}];

Fixed Code Sample

[[NSFileManager defaultManager] createFileAtPath:PATH contents:someData attributes:@{NSFileProtectionKey:NSFileProtectionComplete}];

[[NSFileManager defaultManager] createFileAtPath:PATH contents:someData attributes:@{NSURLFileProtectionKey:NSURLFileProtectionComplete}];

https://www.owasp.org/index.php/Mobile_Top_10_2016-M2-Insecure_Data_Storage