CVE-2019-1890 — MEDIUM (6.5)

Vulnerability Description

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.

CVSS Score

6.5

MEDIUM

CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

Attack Vector

ADJACENT_NETWORK

Attack Complexity

LOW

Privileges Required

NONE

User Interaction

NONE

Scope

UNCHANGED

Confidentiality

NONE

Integrity

HIGH

Availability

NONE

Affected Products

Vendor	Product	Versions
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	-

Related Weaknesses (CWE)

CWE-284

References

http://www.securityfocus.com/bid/109052Third Party AdvisoryVDB Entry
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-2Vendor Advisory
http://www.securityfocus.com/bid/109052Third Party AdvisoryVDB Entry
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-2Vendor Advisory

FAQ

What is CVE-2019-1890?

CVE-2019-1890 is a vulnerability with a CVSS score of 6.5 (MEDIUM). 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, ...

How severe is CVE-2019-1890?

CVE-2019-1890 has been rated MEDIUM with a CVSS base score of 6.5/10. Review the CVSS metrics above for detailed severity breakdown.

Is there a patch for CVE-2019-1890?

Check the references section above for vendor advisories and patch information. Affected products include: Cisco Application Policy Infrastructure Controller, Cisco 9432Pq, Cisco 9536Pq, Cisco 9636Pq, Cisco 9736Pq.