Vulnerabilities > CVE-2019-1890 - Unspecified vulnerability in Cisco Application Policy Infrastructure Controller 7.3(0)Zn(0.113)
Summary
A vulnerability in the fabric infrastructure VLAN connection establishment of the Cisco Nexus 9000 Series Application Centric Infrastructure (ACI) Mode Switch Software could allow an unauthenticated, adjacent attacker to bypass security validations and connect an unauthorized server to the infrastructure VLAN. The vulnerability is due to insufficient security requirements during the Link Layer Discovery Protocol (LLDP) setup phase of the infrastructure VLAN. An attacker could exploit this vulnerability by sending a malicious LLDP packet on the adjacent subnet to the Cisco Nexus 9000 Series Switch in ACI mode. A successful exploit could allow the attacker to connect an unauthorized server to the infrastructure VLAN, which is highly privileged. With a connection to the infrastructure VLAN, the attacker can make unauthorized connections to Cisco Application Policy Infrastructure Controller (APIC) services or join other host endpoints.
Vulnerable Configurations
Nessus
| NASL family | CISCO |
| NASL id | CISCO-SA-20190703-N9KACI-BYPASS.NASL |
| description | According to its self-reported version, the Cisco NX-OS Software in ACI mode is affected by a security bypass vulnerability. An unauthenticated, adjacent attacker could exploit this vulnerability to connect an unauthorized server to the highly privileged infrastructure VLAN. Please see the included Cisco BIDs and Cisco Security Advisory for more information. |
| last seen | 2020-06-01 |
| modified | 2020-06-02 |
| plugin id | 126629 |
| published | 2019-07-12 |
| reporter | This script is Copyright (C) 2019 and is owned by Tenable, Inc. or an Affiliate thereof. |
| source | https://www.tenable.com/plugins/nessus/126629 |
| title | Cisco Nexus 9000 Series Fabric Switches ACI Mode Fabric Infrastructure VLAN Unauthorized Access Vulnerability |