high
7.4
CWE
284
Advisory Published
Updated

CVE-2019-1890: Cisco Nexus 9000 Series Fabric Switches ACI Mode Fabric Infrastructure VLAN Unauthorized Access Vulnerability

First published: Thu Jul 04 2019(Updated: )

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.

Credit: ykramarz@cisco.com

Affected SoftwareAffected VersionHow to fix
Cisco Application Policy Infrastructure Controller=7.3\(0\)zn\(0.113\)
Cisco 9432pq
Cisco 9536pq
Cisco 9636pq
Cisco 9736pq
Cisco N9k-x9432c-s
Cisco N9k-x9464px
Cisco N9k-x9464tx2
Cisco N9k-x9564px
Cisco N9k-x9564tx
Cisco N9k-x9636c-r
Cisco N9k-x9636c-rx
Cisco N9k-x97160yc-ex
Cisco N9k-x9732c-ex
Cisco N9k-x9732c-fx
Cisco N9k-x9736c-ex
Cisco N9k-x9736c-fx
Cisco N9k-x9788tc-fx
Cisco Nexus 92160yc-x
Cisco Nexus 93108tc-ex
Cisco Nexus 93108tc-fx
Cisco Nexus 93120tx
Cisco Nexus 9316d-gx
Cisco Nexus 93180yc-ex
Cisco Nexus 93180yc-fx
Cisco Nexus 93216tc-fx2
Cisco Nexus 93240yc-fx2
Cisco Nexus 9332c
Cisco Nexus 93360yc-fx2
Cisco Nexus 9336c-fx2
Cisco Nexus 9348gc-fxp
Cisco Nexus 93600cd-gx
Cisco Nexus 9364c
Cisco X9636q-r

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Reference Links

Frequently Asked Questions

  • What is CVE-2019-1890?

    CVE-2019-1890 is a vulnerability in the Cisco Nexus 9000 Series Application Centric Infrastructure (ACI) Mode Switch Software that allows an unauthenticated attacker to bypass security validations and connect an unauthorized server to the infrastructure VLAN.

  • How severe is CVE-2019-1890?

    CVE-2019-1890 has a severity score of 6.5, which is considered high.

  • How can an attacker exploit CVE-2019-1890?

    An attacker can exploit CVE-2019-1890 by being adjacent to the vulnerable device and bypassing security validations to connect an unauthorized server to the infrastructure VLAN.

  • Which software versions are affected by CVE-2019-1890?

    The Cisco Nexus 9000 Series Application Centric Infrastructure (ACI) Mode Switch Software version 7.3(0)zn(0.113) is affected by CVE-2019-1890.

  • How can I fix CVE-2019-1890?

    To fix CVE-2019-1890, it is recommended to upgrade to a fixed software release specified in the Cisco Security Advisory.

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