CarrierWave is an open-source RubyGem which provides a simple and flexible way to upload files from Ruby applications. In CarrierWave before versions 1.3.2 and 2.1.1 the download feature has an SSRF vulnerability, allowing attacks to provide DNS entries or IP addresses that are intended for internal use and gather information about the Intranet infrastructure of the platform. This is fixed in versions 1.3.2 and 2.1.1.
https://rubygems.org/gems/carrierwave/
https://github.com/carrierwaveuploader/carrierwave/security/advisories/GHSA-fwcm-636p-68r5
https://github.com/carrierwaveuploader/carrierwave/commit/012702eb3ba1663452aa025831caa304d1a665c0
https://github.com/carrierwaveuploader/carrierwave/blob/master/CHANGELOG.md#211---2021-02-08
https://github.com/carrierwaveuploader/carrierwave/blob/master/CHANGELOG.md#132---2021-02-08