CVSS v3.x: 7.5 (High)
- ~> 5.2.4, >= 126.96.36.199
- >= 188.8.131.52
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 < 184.108.40.206, rails < 220.127.116.11 Not affected: Applications that do not use the direct upload functionality of the ActiveStorage S3 adapter. Fixed Versions: rails >= 18.104.22.168, rails >= 22.214.171.124
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.
This is a low-severity security issue. As such, no workaround is necessarily until such time as the application can be upgraded.