Advisory Weakness Curation

Circumvention of file size limits in ActiveStorage There is a vulnerability in ActiveStorage's S3 adapter that allows the Content-Length of a direct file upload to be modified by an end user. Versions Affected: rails < 5.2.4.2, rails < 6.0.3.1 Not affected: Applications that do not use the direct upload functionality of the ActiveStorage S3 adapter. Fixed Versions: rails >= 5.2.4.3, rails >= 6.0.3.1 Impact ------ Utilizing this vulnerability, an attacker can control the Content-Length of an S3 direct upload URL without receiving a new signature from the server. This could be used to bypass controls in place on the server to limit upload size. Workarounds ----------- This is a low-severity security issue. As such, no workaround is necessarily until such time as the application can be upgraded.

Unrestricted Upload of File with Dangerous Type A client side enforcement of server side security vulnerability exists in rails and rails ActiveStorage's S3 adapter that allows the Content-Length of a direct file upload to be modified by an end user bypassing upload limits.

Unrestricted Upload of File with Dangerous Type A client side enforcement of server side security vulnerability exists in rails and rails ActiveStorage's S3 adapter that allows the `Content-Length` of a direct file upload to be modified by an end user bypassing upload limits.