CVE-2023-20123 : Security Advisory and Response

This CVE involves a vulnerability in the offline access mode of Cisco Duo Two-Factor Authentication for macOS and Duo Authentication for Windows Logon and RDP, which could potentially allow an attacker to replay valid user session credentials and gain unauthorized access to affected devices.

Understanding CVE-2023-20123

This section delves into the specifics of CVE-2023-20123, shedding light on the vulnerability's nature, impact, technical details, and mitigation strategies.

What is CVE-2023-20123?

The vulnerability in Cisco Duo Authentication for macOS and Windows Logon allows an unauthenticated physical attacker to replay valid user session credentials, bypassing multifactor authentication protections, and potentially gaining unauthorized access to the targeted device.

The Impact of CVE-2023-20123

If successfully exploited, this vulnerability could have severe consequences, including unauthorized access to sensitive information on affected macOS or Windows devices. The lack of proper expiration for session credentials creates a window of opportunity for attackers to misuse valid credentials.

Technical Details of CVE-2023-20123

Understanding the technical aspects of this CVE is crucial for implementing effective security measures.

Vulnerability Description

The vulnerability arises from session credentials not expiring properly, enabling attackers to replay multifactor authentication codes and circumvent security measures, ultimately gaining unauthorized access to the device.

Affected Systems and Versions

The affected product is Cisco Duo, with all versions marked as "n/a" denoting vulnerability.

Exploitation Mechanism

Attackers can leverage the vulnerability by replaying previously used multifactor authentication codes to exploit the lack of session credential expiration, allowing them to bypass multifactor authentication protections and gain unauthorized access.

Mitigation and Prevention

Taking immediate steps and adopting long-term security practices are essential to mitigate the risk posed by CVE-2023-20123.

Immediate Steps to Take

Immediately update Cisco Duo Two-Factor Authentication for macOS and Windows Logon to the latest secure version.
Monitor for any suspicious activities or unauthorized access on devices.
Consider implementing additional security layers to enhance device protection.

Long-Term Security Practices

Regularly review and update security protocols and software to address potential vulnerabilities.
Conduct security awareness training for users to recognize and report suspicious activities.
Implement a robust incident response plan to address security incidents promptly.

Patching and Updates

Stay informed about security advisories from vendors, apply patches promptly upon release, and regularly check for updates to ensure devices are protected against known vulnerabilities.