CVE-2018-6337
HIGHFacebook Folly 2017.12.11.00-2018.08.09.00 and HHVM 3.26-3.26.3 - Weak Randomness via Forked Process Buffer Reuse
Title source: llmDescription
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.
References (3)
Core 3
Core References
Release Notes, Vendor Advisory x_refsource_misc
https://hhvm.com/blog/2018/05/24/hhvm-3.26.3.html
Patch, Third Party Advisory x_refsource_misc
https://github.com/facebook/folly/commit/8e927ee48b114c8a2f90d0cbd5ac753795a6761f
Patch, Third Party Advisory x_refsource_misc
https://github.com/facebook/hhvm/commit/e2d10a1e32d01f71aaadd81169bcb9ae86c5d6b8
Scores
CVSS v3
7.5
EPSS
0.0178
EPSS Percentile
75.3%
Attack Vector
NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
CISA SSVC
Vulnrichment
Exploitation
none
Automatable
yes
Technical Impact
partial
Details
CWE
CWE-119
CWE-212
Status
published
Products (2)
facebook/folly
2017.12.11.00 - 2018.08.09.00
facebook/hhvm
3.26 - 3.26.3
Published
Dec 31, 2018
Tracked Since
Feb 18, 2026