Details for this vulnerability have not been published by NIST at this point. Descriptions from software vendor advisories for this issue are provided below.
From VID-85FCA718-99F6-11EA-BF1D-08002728F74C:
Ruby on Rails blog:
Hi everyone! Rails 5.2.4.3 and 6.0.3.1 have been released! These releases contain important security fixes, so please upgrade when you can.
Both releases contain the following fixes:
CVE-2020-8162: Circumvention of file size limits in ActiveStorage
CVE-2020-8164: Possible Strong Parameters Bypass in ActionPack
CVE-2020-8165: Potentially unintended unmarshalling of user-provided objects in MemCacheStore and RedisCacheStore
CVE-2020-8166: Ability to forge per-form CSRF tokens given a global CSRF token
CVE-2020-8167: CSRF Vulnerability in rails-ujs
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