CWE-333: Improper Handling of Insufficient Entropy in TRNG
True random number generators (TRNG) generally have a limited source of entropy and therefore can fail or block.
How it's found
Improper Handling of Insufficient Entropy in TRNG is a specific, narrowly defined instance of a broader pattern. Testers confirm it with targeted code review and a proof-of-concept input that exercises the exact code path this weakness describes.
The rate at which true random numbers can be generated is limited. It is important that one uses them only when they are needed for security.
Consequences
- DoS: Crash, Exit, or Restart: A program may crash or block if it runs out of random numbers.
Mitigations
- Implementation: Rather than failing on a lack of random numbers, it is often preferable to wait for more numbers to be created.
Where this fits in a TurboPentest engagement
This weakness is not covered by the automated black-box pentest. IntegSec pentesters cover it in a manual engagement.
Frequently asked questions
What is CWE-333?
True random number generators (TRNG) generally have a limited source of entropy and therefore can fail or block.
How do you find Improper Handling of Insufficient Entropy in TRNG?
Improper Handling of Insufficient Entropy in TRNG is a specific, narrowly defined instance of a broader pattern. Testers confirm it with targeted code review and a proof-of-concept input that exercises the exact code path this weakness describes.
What is the impact of CWE-333?
DoS: Crash, Exit, or Restart: A program may crash or block if it runs out of random numbers.
Does TurboPentest test for Improper Handling of Insufficient Entropy in TRNG?
This weakness is not covered by the automated black-box pentest. IntegSec pentesters cover it in a manual engagement.
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Written and reviewed by
Michel Chamberland - Founder & CEO, IntegSec
CISSP, OSCP, OSCE, CEH, GIAC, CCSK · 20+ years in offensive security
Michel has spent 20+ years on offensive security teams including IBM X-Force Red and Trustwave SpiderLabs, leading penetration tests, red team engagements, and breach response for Fortune 500 customers. He is the founder of IntegSec and the architect of TurboPentest.
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