CVE-2024-21383 is a security vulnerability identified in the Chromium-based Microsoft Edge browser. It is classified under CWE-347, which pertains to improper verification of cryptographic signatures. This vulnerability allows for spoofing attacks due to the browser's failure to correctly verify cryptographic signatures in certain contexts. Specifically, the flaw could enable an attacker to present forged content or data that appears legitimate to the browser, potentially misleading users or bypassing security checks. The vulnerability affects version 1.0.0 of Microsoft Edge (Chromium-based), and while the exact attack vector details are limited, the CVSS vector indicates that the attack requires local access (Attack Vector: Local), low attack complexity, no privileges required, but user interaction is necessary. The impact is limited to integrity, with no confidentiality or availability impact reported. No known exploits are currently in the wild, and no patches have been linked yet. The vulnerability was published on January 26, 2024, and is considered low severity with a CVSS score of 3.3. The improper verification of cryptographic signatures could allow attackers to spoof content or data, potentially tricking users or security mechanisms, but the requirement for local access and user interaction limits the exploitability and scope of impact.

For European organizations, the impact of CVE-2024-21383 is relatively limited due to its low severity and the conditions required for exploitation. The vulnerability could allow an attacker with local access to a device to spoof cryptographic signatures within Microsoft Edge, potentially misleading users or bypassing certain integrity checks. This could be exploited in targeted scenarios such as insider threats or through social engineering that convinces users to interact with malicious content locally. However, since the vulnerability does not affect confidentiality or availability, the risk of data breaches or service disruption is minimal. European organizations with strict data protection regulations like GDPR should still consider the risk of integrity compromise, especially in environments where Edge is used for sensitive operations or internal applications relying on cryptographic verification. The lack of known exploits and the requirement for user interaction reduce the immediate threat level, but organizations should remain vigilant and monitor for updates or patches from Microsoft.

To mitigate CVE-2024-21383, European organizations should implement the following specific measures: 1) Ensure that all users run the latest version of Microsoft Edge and apply security updates promptly once patches addressing this vulnerability are released by Microsoft. 2) Restrict local access to devices running Microsoft Edge, enforcing strict endpoint security controls such as device lockdown, user privilege management, and endpoint detection and response (EDR) solutions to detect suspicious local activities. 3) Educate users about the risks of interacting with untrusted content or links, especially in scenarios requiring local user interaction, to reduce the likelihood of social engineering exploitation. 4) Monitor internal network and endpoint logs for unusual activities that could indicate attempts to exploit local vulnerabilities. 5) For environments where cryptographic signature verification is critical, consider additional application-layer verification or alternative browsers until a patch is available. 6) Coordinate with IT and security teams to prepare for rapid deployment of patches once Microsoft releases them, minimizing the window of exposure.