Friday, May 19, 2017

ICMC17: Crypto: You're Doing it Wrong

Jon Green, Sr. Director, Security Architecture and Federal CTO, Aruba Networks/HPE

Flaws can be varied and sad - like forgetting to use crypto (like calling a function that was never completed for your DRBG! Jon showed us an example of validated code that was an empty function who's comment contained TODO). Other issues in large multi-module products that may contain code written in C, Java, Python, PhP, JavaScript, Go, Bash... claiming to get FIPS from OpenSSL. Most of languages aren't going to be using OpenSSL, so they won't be using FIPS validated crypto.

Developers often don't know where the crypto is happening. They may forget to complete certain code segments, relay on 3rd party and open source and rely on multiple frameworks. Or even if they do, they may not want to dive in because of the amount of work required to make things work correctly, particularly from a  FIPS perspective..

What about the FIPS code review done by the lab? Almost certainly not, as they are typically looking at the application code - just the low level crypto and RNG functions. Even with the old German scheme for EAL4 deeper code review, still miss issues (like the above TODO code that went through EAL2 and EAL4 review).  Testing misses these nuances as well.

Security audits of your code are very fruitful, but very expensive. He's seen success with bug bounty programs, even if the code is closed.

He's also seen problems with FIPS deployments that are leveraging "FIPS inside" where they leverage another module, like OpenSSL, but forgot to turn on FIPS mode and forgot to update the applications so they would not try to use non-FIPS algorithms.

Another problematic approach - the dev follows all the steps to deploy CenOS in FIPS mode by following the RedHat documentation... except that documentation only applies to RedHat and *not* CentOS. Yes, it's the same source code , but validations are not transitive. A RedHat validation only applies to RedHat deployments.

To get this right, identify services that really need to be FIPS validated and focus your efforts there..

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