CarrierWave vulnerabilities

CarrierWave did not fully address CVE-2023-49090. When uploading to object storage (e.g., Amazon S3), it is possible to set a Content-Type value that browsers interpret differently from what content_type_allowlist permits, by providing multiple comma-separated values.

CarrierWave is a solution for file uploads for Rails, Sinatra and other Ruby web frameworks. CarrierWave has a Content-Type allowlist bypass vulnerability, possibly leading to XSS. The validation in allowlisted_content_type? determines Content-Type permissions by performing a partial match. If the content_type argument is crafted by an attacker, Content-Types not included in the allowlist will be allowed. This issue has been patched in versions 2.2.5 and 3.0.5.

In the CarrierWave framework, versions prior to 2.2.7 and 3.1.3, the content_type_denylist check fails to properly handle regex metacharacters in string entries, leading to intended content types not being blocked. As a result, applications may be vulnerable to XSS attacks through uploading SVG files containing malicious JavaScript.