tsup, DOM Clobbering Vulnerability, CVE-2025-XXXX Low Severity

How the Mentioned CVE Works:

The CVE-2025-XXXX vulnerability in tsup v8.3.4 is a DOM Clobbering issue that occurs in the `cjs_shims.js` component. Attackers can exploit this vulnerability by injecting a crafted script that manipulates the `import.meta.url` property, which is then improperly handled when referenced in document.currentScript. This allows the attacker to overwrite or “clobber” critical DOM properties, leading to arbitrary code execution. The vulnerability arises due to insufficient validation of user-controlled input in the DOM, enabling malicious scripts to alter the behavior of the application.

DailyCVE Form:

Platform: tsup
Version: v8.3.4
Vulnerability: DOM Clobbering
Severity: Low
Date: Mar 3, 2025

What Undercode Say:

Exploitation:

1. Crafting the Payload:

Attackers can create a malicious script that manipulates `import.meta.url` to point to a controlled resource.

Example:

<script>import.meta.url = 'malicious.js';</script>

2. Triggering the Vulnerability:

The crafted script is injected into the application, and when `document.currentScript` is accessed, it references the malicious URL.

3. Arbitrary Code Execution:

The application executes the malicious script, leading to potential data theft or further exploitation.

Protection:

1. Input Validation:

Ensure all user inputs are sanitized and validated before being processed by the DOM.

Example:

if typeof import.meta.url === 'string' && isValidURLimport.meta.url {
// Proceed
}

2. Content Security Policy CSP:

Implement a strict CSP to prevent unauthorized script execution.

Example CSP Header:

Content-Security-Policy: script-src 'self';

3. Library Updates:

Upgrade to a patched version of tsup if available.

4. Code Review:

Regularly review and audit code for DOM manipulation vulnerabilities.

Commands:

Check for Vulnerable Versions:
```
npm list tsup
```
Upgrade tsup:
```
npm install tsup@latest
```

References:

[GitHub Advisory Database]https://github.com/advisories
[National Vulnerability Database]https://nvd.nist.gov/
[DOM Clobbering Explained]https://portswigger.net/research/dom-clobbering

Code Snippets:

Sanitization Function:

function isValidURLurl {
try {
new URLurl;
return true;
} catch e {
return false;
}
}

CSP Implementation:
```
<meta http-equiv="Content-Security-Policy" content="script-src 'self';">
```
By following these steps, developers can mitigate the risks associated with this DOM Clobbering vulnerability.

References:

Reported By: https://github.com/advisories/GHSA-3mv9-4h5g-vhg3
Extra Source Hub:
Undercode

Image Source:

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