CVE-2023-20269
Vulnérabilité moyenne dans Cisco Adaptive Security Appliance (ASA) Software (Cisco)
Description
A vulnerability in the remote access VPN feature of Cisco Adaptive Security Appliance (ASA) Software and Cisco Firepower Threat Defense (FTD) Software could allow an unauthenticated, remote attacker to conduct a brute force attack in an attempt to identify valid username and password combinations or an authenticated, remote attacker to establish a clientless SSL VPN session with an unauthorized user. This vulnerability is due to improper separation of authentication, authorization, and accounting (AAA) between the remote access VPN feature and the HTTPS management and site-to-site VPN features. An attacker could exploit this vulnerability by specifying a default connection profile/tunnel group while conducting a brute force attack or while establishing a clientless SSL VPN session using valid credentials. A successful exploit could allow the attacker to achieve one or both of the following: Identify valid credentials that could then be used to establish an unauthorized remote access VPN session. Establish a clientless SSL VPN session (only when running Cisco ASA Software Release 9.16 or earlier). Notes: Establishing a client-based remote access VPN tunnel is not possible as these default connection profiles/tunnel groups do not and cannot have an IP address pool configured. This vulnerability does not allow an attacker to bypass authentication. To successfully establish a remote access VPN session, valid credentials are required, including a valid second factor if multi-factor authentication (MFA) is configured. Cisco will release software updates that address this vulnerability. There are workarounds that address this vulnerability.
Gravité et risque d'exploitation
CVE-2023-20269 obtient un score CVSS de 5.0/10, soit une gravité moyenne. Selon le modèle EPSS, la probabilité qu'elle soit exploitée dans les 30 prochains jours est de 25.45 %, ce qui la place devant 97.9 % des CVE référencées.
Que faire ?
- Vérifiez si Cisco Adaptive Security Appliance (ASA) Software (versions 7.0.4, 7.2.2, 9.8.4.12, 9.8.3.18, 9.8.3, 9.12.3.2, 9.16.4.27, 9.8.4.45, 9.8.3.29, 9.17.1.13, 9.8.2.28, 9.16.3.15, 6.6.5, 9.14.3, 9.12.4.54, 9.12.4.56, 9.12.4.7, 9.8.2.15, 9.12.4.4, 9.19.1.9, 7.2.4, 9.19.1.18, 6.4.0.15, 6.6.7, 9.12.2, 9.17.1.9, 9.8.4.46, 6.2.3.5, 9.12.4.55, 9.15.1.7, 6.7.0, 9.16.1.28, 9.8.2, 9.8.3.16, 6.2.3.15, 9.14.3.15, 7.3.1.1, 9.16.4.9, 9.16.2.7, 9.14.4.23, 9.12.4.26, 7.0.5, 7.1.0.1, 7.2.0, 9.8.4.25, 7.2.0.1, 9.14.4.17, 9.8.3.26, 9.8.4.26, 9.14.4.7, 9.12.2.4, 9.8.4.3, 9.14.3.18, 6.2.3.14, 9.14.1.6, 9.12.3.9, 9.14.4.13, 6.4.0.6, 9.12.4.35, 9.12.4.29, 9.8.2.14, 6.4.0.9, 9.18.3.55, 7.0.2, 7.2.1, 9.12.1, 9.12.4.13, 9.17.1.7, 7.0.6, 9.8.2.35, 7.0.1, 9.8.4.33, 9.8.3.11, 9.14.4, 6.6.1, 9.12.4.30, 9.8.2.8, 9.12.4.52, 9.14.2.4, 9.16.3.19, 9.14.4.22, 9.14.3.9, 6.4.0.14, 9.8.4.48, 9.15.1.15, 9.12.4.8, 9.17.1, 9.14.3.1, 7.1.0.2, 9.15.1.1, 9.18.1.3, 9.8.2.17, 6.2.3.1, 9.14.3.11, 9.8.4.20, 9.8.4.22, 9.8.4.8, 9.17.1.10, 9.18.2, 9.8.1.7, 9.18.3, 6.4.0.7, 6.2.3.8, 6.2.3.11, 6.6.7.1, 6.4.0.2, 9.17.1.20, 6.6.5.2, 9.8.3.8, 6.2.3.4, 9.12.2.1, 9.14.4.14, 9.17.1.11, 7.0.0.1, 9.12.4.50, 7.0.1.1, 9.18.2.8, 7.2.3, 6.2.3.3, 6.2.3.6, 9.12.4, 6.2.3.9, 9.14.4.15, 9.12.2.5, 7.3.0, 9.12.4.58, 6.7.0.1, 9.12.4.39, 6.4.0.13, 9.18.3.53, 9.18.1, 9.8.4.40, 9.14.4.12, 9.8.4.10, 6.7.0.3, 9.16.3, 9.14.1.10, 9.16.2.14, 9.16.4.19, 6.4.0.12, 6.7.0.2, 9.14.2.15, 9.12.3, 9.12.3.7, 6.2.3.2, 9.8.4.17, 7.2.5, 6.6.4, 7.0.2.1, 9.12.1.2, 9.14.1.30, 9.14.2.13, 9.14.4.6, 9.15.1.10, 9.8.1, 9.14.1.19, 9.16.3.23, 9.8.4.35, 9.8.2.24, 9.16.2.11, 9.8.4.15, 9.8.1.5, 6.4.0, 9.16.3.3, 9.8.2.26, 9.18.2.5, 9.8.3.14, 7.0.3, 9.8.4.43, 6.2.3.18, 9.8.4.44, 9.8.2.20, 9.16.2.3, 6.4.0.8, 9.14.2.8, 9.8.3.21, 9.15.1.21, 9.8.2.33, 6.6.0.1, 7.4.0, 9.12.4.38, 9.8.4.29, 9.14.1.15, 9.8.4.41, 9.17.1.15, 7.1.0, 9.8.2.38, 9.8.4.34, 7.2.4.1, 9.14.2, 7.1.0.3, 6.6.5.1, 6.4.0.16, 9.12.4.41, 9.18.3.39, 6.4.0.10, 9.8.4.32, 9.16.2, 9.16.4.14, 9.19.1, 6.6.3, 9.16.4.38, 9.16.3.14, 6.4.0.4, 9.12.4.10, 6.2.3.16, 9.12.4.37, 9.8.4.7, 9.12.1.3, 6.2.3, 9.12.4.24, 9.17.1.30, 6.2.3.17, 9.12.2.9, 9.14.3.13, 6.2.3.7, 7.0.0, 6.4.0.11, 9.18.2.7, 9.16.4.18, 9.16.1, 9.14.1, 9.12.4.2, 9.12.4.47, 6.4.0.5, 9.19.1.5, 9.16.4, 9.18.3.46, 9.8.4, 6.2.3.13, 9.12.4.18, 6.4.0.1, 9.15.1.17, 9.16.2.13, 6.2.3.12, 9.15.1.16, 9.12.4.40, 6.2.3.10, 9.19.1.12, 9.12.4.48, 7.3.1, 6.4.0.3, 9.15.1, 9.12.3.12, 6.6.0, 9.8.4.39) est présent sur votre parc.
- Appliquez le correctif ou la version corrigée indiqués dans les références de l'éditeur.
- À défaut de correctif, limitez l'exposition (filtrage réseau, désactivation du composant).
- Automatisez la détection : les agents CVE Heimdall (gratuits, open source) corrèlent l'inventaire de vos serveurs avec la base CVE.