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CVE-2018-6337 folly::secureRandom will re-use a buffer between parent and child processes when fork() is called

Description

folly::secureRandom will re-use a buffer between parent and child processes when fork() is called. That will result in multiple forked children producing repeat (or similar) results. This affects HHVM 3.26 prior to 3.26.3 and the folly library between v2017.12.11.00 and v2018.08.09.00.

Affected products and versions

Product Affected versions Fixed in
HHVM 3.26 3.26.0 → latest No fix stated
folly 2018.08.09.00 No fix stated
folly 2017.12 2017.12.11.00 → latest No fix stated

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