description: A vulnerability in the implementation of Security Assertion Markup Language (SAML) 2.0 single sign-on (SSO) for remote access VPN in Cisco Adaptive Security Appliance (ASA) Software and Cisco Firepower Threat Defense (FTD) Software could allow an unauthenticated, remote attacker to intercept the SAML assertion of a user who is authenticating to a remote access VPN session. This vulnerability is due to insufficient validation of the login URL. An attacker could exploit this vulnerability by persuading a user to access a site that is under the control of the attacker, allowing the attacker to modify the login URL. A successful exploit could allow the attacker to intercept a successful SAML assertion and use that assertion to establish a remote access VPN session toward the affected device with the identity and permissions of the hijacked user, resulting in access to the protected network.
problem types: URL Redirection to Untrusted Site ('Open Redirect')
affected:
{
vendor: Cisco
product: Cisco Adaptive Security Appliance (ASA) Software
versions:
version: 9.18.1, status: affected
version: 9.18.1.3, status: affected
version: 9.18.2, status: affected
version: 9.18.2.5, status: affected
version: 9.18.2.7, status: affected
version: 9.18.2.8, status: affected
version: 9.18.3, status: affected
version: 9.18.3.39, status: affected
version: 9.18.3.46, status: affected
version: 9.19.1.5, status: affected
version: 9.19.1.9, status: affected
version: 9.19.1.12, status: affected
}
{
vendor: Cisco
product: Cisco Firepower Threat Defense Software
versions:
version: 7.2.4, status: affected
}
metrics:
format: cvssV3_1
cvssV3_1: [
version: 3.1
vectorString: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
baseScore: 6.1
baseSeverity: MEDIUM
attackVector: NETWORK
attackComplexity: LOW
privilegesRequired: NONE
userInteraction: REQUIRED
scope: CHANGED
confidentialityImpact: LOW
integrityImpact: LOW
availabilityImpact: NONE
]
exploits: The Cisco Product Security Incident Response Team (PSIRT) is not aware of any public announcements or malicious use of the vulnerability that is described in this advisory.