CVE-2023-20123 Cisco Duo Authentication for macOS and Duo Authentication for Windows Logon Offline Credentials Replay Vulnerability
Physical attackers can replay expired MFA codes in offline mode to bypass authentication and gain unauthorized access to macOS or Windows devices.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Local or same network only
- Victim action needed
- A user has to click or open something
- Fix
- None listed
What is CVE-2023-20123?
CVE-2023-20123 is a medium-severity authentication bypass vulnerability in Cisco Duo, published on 5 Apr 2023. It can only be exploited from the same machine or local network, and only if a user opens a file or follows a link.
Official description
A vulnerability in the offline access mode of Cisco Duo Two-Factor Authentication for macOS and Duo Authentication for Windows Logon and RDP could allow an unauthenticated, physical attacker to replay valid user session credentials and gain unauthorized access to an affected macOS or Windows device. This vulnerability exists because session credentials do not properly expire. An attacker could exploit this vulnerability by replaying previously used multifactor authentication (MFA) codes to bypass MFA protection. A successful exploit could allow the attacker to gain unauthorized access to the affected device.
Weakness: CWE-294
Which versions are affected by CVE-2023-20123?
It affects 2 products.
Products include Cisco Duo, Cisco Duo Authentication for Windows Logon and Rdp.
How do I fix CVE-2023-20123?
No fix has been published for CVE-2023-20123 yet. Limit exposure of the affected software until one is available.
Upgrade, and rotate credentials and sessions that may have been exposed. More about Authentication bypass.
Is CVE-2023-20123 being exploited?
There is no known exploitation of CVE-2023-20123 in the wild and no public exploit code.
Other vulnerabilities in Cisco Duo
Sources
Also known as GHSA-gp8j-qw75-8q9q.