Authentication Bypass in Cisco Duo Authentication for macOS and Duo Authentication for Windows Logon

1) Authentication Bypass by Capture-replay

EUVDB-ID: #VU74551

Risk: Low

CVSSv3.1: 5.5 [CVSS:3.1/AV:P/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2023-20123

CWE-ID: CWE-294 - Authentication Bypass by Capture-replay

Exploit availability: No

Description

The vulnerability allows a local attacker to bypass authentication process.

The vulnerability exists due to session credentials do not properly expire within the offline access mode. An attacker with physical access can replay previously used multifactor authentication (MFA) codes to bypass MFA protection.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

Duo Two-Factor Authentication for macOS: 2.0

Duo Authentication for Windows Logon and RDP: 4.2

External links

http://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-duo-replay-knuNKd

Q & A

Can this vulnerability be exploited remotely?

No. The attacker should have physical access to the system in order to successfully exploit this vulnerability.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.