Google Chrome is one of the most widely used web browsers, and its security is of utmost importance for users worldwide. In this post, we will discuss a critical Use After Free vulnerability in FedCM of Google Chrome. Specifically, we will cover exploit details, code snippets, and links to original references and patches.

CVE Details

CVE-2024-2176 refers to a Use After Free vulnerability in the FedCM (Federated Credential Management) implementation in Google Chrome. Chrome versions before 122..6261.111 are susceptible to this vulnerability, which allows remote attackers to exploit heap corruption via a crafted HTML page. This vulnerability is classified as 'High' under Chromium's security severity classification.

Exploit Details

The exploitation of CVE-2024-2176 potentially allows remote attackers to cause a heap corruption. The heap is an area of memory used to dynamically allocate, resize, and free memory blocks during the runtime of an application.

Heap corruption occurs when a program modifies the heap's metadata, thus disrupting the heap structure. This corruption can lead to application crashes, arbitrary code execution, and even information disclosure.

This exploit requires the remote attacker to create and deliver a malicious HTML page containing specially crafted JavaScript code to trigger the vulnerability. Once the victim visits the malicious page, the crafted JavaScript code in the page would cause a Use After Free condition within the FedCM implementation of the browser.

Code Snippet

Below is a simplified example of how a crafted JavaScript code that could potentially trigger this vulnerability might look like:

(async function() {
  const fedcm = new FederatedCredential({...});
  const creds = await navigator.credentials.get({...});
  if (creds) {
    navigator.credentials.store(fedcm);
    // Trigger the use after free through carefully crafted conditions
  }
})();

Please note that this code snippet only represents a possible structure and does not necessarily guarantee the exploitation of the vulnerability.

Original References

- Vulnerability report: Chromium Bug #1258987
- Patch commit: Chromium Commit #45b414e

Mitigations

Google Chrome has released a patch to address this vulnerability in version 122..6261.111. Users are advised to update their browsers to the latest version to protect against this threat. You can find the latest version of Google Chrome here.

Conclusion

CVE-2024-2176 is a significant vulnerability that affects Google Chrome versions prior to 122..6261.111. By exploiting this vulnerability, an attacker can potentially cause heap corruption and compromise the victim's browser's security through a crafted HTML page. Users should update their Google Chrome installations as soon as possible to stay safe from potential attacks.

Timeline

Published on: 03/06/2024 19:15:09 UTC
Last modified on: 08/08/2024 21:35:08 UTC