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Date: Wed, 8 May 2019 11:19:29 +0200 (CEST)
From: Roman Drahtmueller <draht@...altsekun.de>
To: oss-security@...ts.openwall.com, Seong-Joong Kim <sungjungk@...il.com>
Subject: Re: Re: fprintd: found storing user fingerprints
without encryption
>> Dear all,
>>
>> I would like to report a vulnerability of 'fprintd'.
>>
>> 'fprintd' does not encrypt sensitive information before storage.
>> *CWE-311: Missing Encryption of Sensitive Data*
[...]
This misses the point.
* Encryption shifts the problem to protecting the symmetric key, which
is the very same problem. => Encryption solves other problems, but not
this one.
* If you have sufficient privileges to access the fingerprint data,
then you no longer need the data.
* You can't "safeguard" the fingerprint data by applying additional O/S
controls such as SELinux, AppArmor, etc, you can only add more useful
privilege transitions and protect against attacks that exploit
implementation errors. Google "store fingerprint data ios android",
there are suitable solutions.
Mostly: Your fingerprint is not a secret like a password, it is a username.
Since you can't change the fingerprint (biometrics problem), it is not
very useful as a single authentication factor. Either you live with
this, or you combine the fingerprint with a different authentication
factor type.
Roman.
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