GHSA-wppf-gqj5-fc4f REDAXO allows Arbitrary File Upload in the mediapool page

• Packagist redaxo/source: < 5.18.3 → fixed in 5.18.3

Summary An arbitrary file upload vulnerability was identified in the redaxo. This flaw permits users to upload malicious files, which can lead to JavaScript code execution and distribute malware. Details On the latest version of Redaxo, v5.18.2, the mediapool/media page is vulnerable to arbitrary file upload. PoC 1. Log in to the portal then navigate to `Mediapool`. 2. Upload a png file (ex: poc.png) 3. Intercept the upload HTTP request on burp suite and change `filename: poc.1html`, `Content-Type:image/html` and insert the malicious html code. (ex: ``) 4. Forward the request. 5. Navigate to the file. Impact Exploiting an arbitrary file upload vulnerability enables attackers to execute malicious code on a server.