Vulnerability Name: CVE-2018-0227 (CCN-141808) Assigned: 2017-11-27 Published: 2018-04-18 Updated: 2022-06-27 Summary: A vulnerability in the Secure Sockets Layer (SSL) Virtual Private Network (VPN) Client Certificate Authentication feature for Cisco Adaptive Security Appliance (ASA) could allow an unauthenticated, remote attacker to establish an SSL VPN connection and bypass certain SSL certificate verification steps. The vulnerability is due to incorrect verification of the SSL Client Certificate. An attacker could exploit this vulnerability by connecting to the ASA VPN without a proper private key and certificate pair. A successful exploit could allow the attacker to establish an SSL VPN connection to the ASA when the connection should have been rejected. This vulnerability affects Cisco Adaptive Security Appliance (ASA) and Firepower Threat Defense (FTD) Software that is running on the following Cisco products: 3000 Series Industrial Security Appliances (ISA), ASA 5500 Series Adaptive Security Appliances, ASA 5500-X Series Next-Generation Firewalls, ASA Services Module for Cisco Catalyst 6500 Series Switches and Cisco 7600 Series Routers, Adaptive Security Virtual Appliances (ASAv), Firepower 4110 Security Appliances, Firepower 9300 ASA Security Modules. Cisco Bug IDs: CSCvg40155. CVSS v3 Severity: 7.5 High (CVSS v3.1 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N 6.5 Medium (Temporal CVSS v3.1 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N/E:U/RL:O/RC:C Exploitability Metrics: Attack Vector (AV): NetworkAttack Complexity (AC): LowPrivileges Required (PR): NoneUser Interaction (UI): NoneScope: Scope (S): UnchangedImpact Metrics: Confidentiality (C): NoneIntegrity (I): HighAvailibility (A): None
7.5 High (CCN CVSS v3.1 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N 6.5 Medium (CCN Temporal CVSS v3.1 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N/E:U/RL:O/RC:C Exploitability Metrics: Attack Vector (AV): NetworkAttack Complexity (AC): LowPrivileges Required (PR): NoneUser Interaction (UI): NoneScope: Scope (S): UnchangedImpact Metrics: Confidentiality (C): NoneIntegrity (I): HighAvailibility (A): None
CVSS v2 Severity: 5.0 Medium (CVSS v2 Vector: AV:N/AC:L/Au:N/C:N/I:P/A:N Exploitability Metrics: Access Vector (AV): NetworkAccess Complexity (AC): LowAuthentication (Au): NoneImpact Metrics: Confidentiality (C): NoneIntegrity (I): PartialAvailibility (A): None
7.8 High (CCN CVSS v2 Vector: AV:N/AC:L/Au:N/C:N/I:C/A:N Exploitability Metrics: Access Vector (AV): NetworkAccess Complexity (AC): LowAthentication (Au): NoneImpact Metrics: Confidentiality (C): NoneIntegrity (I): CompleteAvailibility (A): None
Vulnerability Type: CWE-295 Vulnerability Consequences: Bypass Security References: Source: MITRECVE-2018-0227 104018 Multiple Cisco Products CVE-2018-0227 SSL Certificate Validation Security Bypass Vulnerability 1040723 cisco-asa1-cve20180227-sec-bypass(141808) https://ics-cert.us-cert.gov/advisories/ICSA-18-184-01 Cisco Adaptive Security Appliance Virtual Private Network SSL Client Certificate Bypass Vulnerability https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20180418-asa1 Vulnerable Configuration: Configuration 1 :cpe:/o:cisco:adaptive_security_appliance_software:*:*:*:*:*:*:*:* (Version >= 9.6.2.9 and <= 9.6.2.21)OR cpe:/o:cisco:adaptive_security_appliance_software:*:*:*:*:*:*:*:* (Version >= 9.6.3 and <= 9.6.3.17) OR cpe:/o:cisco:adaptive_security_appliance_software:9.5.2.7:*:*:*:*:*:*:* OR cpe:/o:cisco:adaptive_security_appliance_software:9.5.2.8:*:*:*:*:*:*:* OR cpe:/o:cisco:adaptive_security_appliance_software:*:*:*:*:*:*:*:* (Version >= 9.5.3.7 and <= 9.5.3.9) OR cpe:/o:cisco:adaptive_security_appliance_software:9.4.3.1:*:*:*:*:*:*:* OR cpe:/o:cisco:adaptive_security_appliance_software:9.4.3.2:*:*:*:*:*:*:* OR cpe:/o:cisco:adaptive_security_appliance_software:*:*:*:*:*:*:*:* (Version >= 9.4.4 and <= 9.4.4.13) Configuration 2 :cpe:/a:cisco:firepower_threat_defense:*:*:*:*:*:*:*:* (Version >= 6.0 and <= 6.0.1.4)OR cpe:/a:cisco:firepower_threat_defense:*:*:*:*:*:*:*:* (Version >= 6.1.0 and <= 6.1.0.5) Configuration CCN 1 :cpe:/o:cisco:adaptive_security_appliance_software:9.4.3.1:*:*:*:*:*:*:* OR cpe:/o:cisco:adaptive_security_appliance_software:9.4.3.2:*:*:*:*:*:*:* OR cpe:/a:cisco:adaptive_security_appliance_software:9.4.4:*:*:*:*:*:*:* OR cpe:/a:cisco:adaptive_security_appliance_software:9.4(4)13:*:*:*:*:*:*:* OR cpe:/o:cisco:adaptive_security_appliance_software:9.5.2.7:*:*:*:*:*:*:* OR cpe:/o:cisco:adaptive_security_appliance_software:9.5.2.8:*:*:*:*:*:*:* OR cpe:/a:cisco:adaptive_security_appliance_software:9.5.3.7:*:*:*:*:*:*:* OR cpe:/a:cisco:adaptive_security_appliance_software:9.6.2.9:*:*:*:*:*:*:* OR cpe:/a:cisco:adaptive_security_appliance_software:9.6.3:*:*:*:*:*:*:* OR cpe:/a:cisco:adaptive_security_appliance_software:9.6(3)17:*:*:*:*:*:*:* BACK
cisco adaptive security appliance software *
cisco adaptive security appliance software *
cisco adaptive security appliance software 9.5.2.7
cisco adaptive security appliance software 9.5.2.8
cisco adaptive security appliance software *
cisco adaptive security appliance software 9.4.3.1
cisco adaptive security appliance software 9.4.3.2
cisco adaptive security appliance software *
cisco firepower threat defense *
cisco firepower threat defense *
cisco adaptive security appliance software 9.4.3.1
cisco adaptive security appliance software 9.4.3.2
cisco adaptive security appliance software 9.4.4
cisco adaptive security appliance software 9.4(4)13
cisco adaptive security appliance software 9.5.2.7
cisco adaptive security appliance software 9.5.2.8
cisco adaptive security appliance software 9.5.3.7
cisco adaptive security appliance software 9.6.2.9
cisco adaptive security appliance software 9.6.3
cisco adaptive security appliance software 9.6(3)17
Denotes that component is vulnerable