CVE-2023-5725 - Malicious WebExtension Opening Arbitrary URLs Could Expose Sensitive User Data: An In-Depth Analysis and Solution

In the ever-evolving world of cybersecurity, online browser security has become of paramount importance. A vulnerability (CVE-2023-5725) has recently been discovered that, if exploited, could result in significant consequences including leaking sensitive user data. In this post, we will delve into the details of this vulnerability, including its origins, impact, and recommended mitigation strategies.

Description of the Vulnerability

CVE-2023-5725 refers to a dangerous flaw discovered in Firefox (< 119), Firefox ESR (< 115.4), and Thunderbird (< 115.4.1) browser versions susceptible to a WebExtension-based attack. A maliciously installed WebExtension can exploit this vulnerability to open arbitrary URLs, potentially collecting sensitive user data in the process.

Original References

The CVE assigned to this vulnerability, CVE-2023-5725, can be found in the National Vulnerability Database (NVD). You can read more about the vulnerability at the following link:

- NVD: https://nvd.nist.gov/vuln/detail/CVE-2023-5725

Additionally, Mozilla's security advisory page also contains helpful information about this vulnerability:

- Mozilla: https://www.mozilla.org/en-US/security/advisories/mfsa2023-5725/

Details of the Exploit

To execute the exploit, the attacker must first install the malicious WebExtension on the victim's browser. With this WebExtension, the attacker can then create and open arbitrary URLs to access sensitive user data. A simplified code snippet demonstrating this exploit is shown below:

// Malicious WebExtension example
function openArbitraryUrl(url) {
  var creating = browser.tabs.create({
    url: url,
  });

  creating.then(onCreated, onError);
}

function onCreated(tab) {
  console.log(Opened URL: ${tab.url});
}

function onError(error) {
  console.log(Error: ${error});
}

// Execute the exploit
openArbitraryUrl("https://www.example.com/sensitive";);

Potential Impact

The potential impact of CVE-2023-5725 cannot be understated. A successfully executed exploit can lead to unauthorized access to personal and sensitive user data. Attackers can then leverage this data for malicious purposes, such as identity theft or financial fraud, putting users at significant risk.

Mitigating the Vulnerability

To combat this vulnerability in Firefox, Firefox ESR, and Thunderbird, it is crucial to ensure your browser is up-to-date with the latest security patches. Mozilla has released updated versions to address this issue:

- Firefox 119 and above: https://www.mozilla.org/en-US/firefox/new/
- Firefox ESR 115.4 and above: https://www.mozilla.org/en-US/firefox/organizations/
- Thunderbird 115.4.1 and above: https://www.mozilla.org/en-US/thunderbird/download/

Furthermore, users should be cautious when installing browser extensions, only downloading and granting permissions to extensions from trusted sources.

Conclusion

In conclusion, vulnerability CVE-2023-5725 poses a serious threat to user data security. It is important to update the affected browsers immediately and exercise caution when installing browser extensions. By taking these necessary precautions, users can minimize the risks associated with this vulnerability and ensure their sensitive information remains protected.

Timeline

Published on: 10/25/2023 18:17:44 UTC
Last modified on: 11/02/2023 20:28:43 UTC