Instituto Nacional de ciberseguridad. Sección Incibe
Instituto Nacional de Ciberseguridad. Sección INCIBE-CERT

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CVE-2019-1890

Severity CVSS v4.0:
Pending analysis
Type:
Unavailable / Other
Publication date:
04/07/2019
Last modified:
16/10/2020

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.

Impact

Vector 3.x
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N CVSS v3.1 Severity and Metrics:

Base Score: 6.50 MEDIUM
Vector: CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

Attack Vector (AV): Adjacent
Attack Complexity (AC): Low
Privileges Required (PR): None
User Interaction (UI): None
Scope (S): Unchanged
Confidentiality (C): None
Integrity (I): High
Availability (A): None

Base Score 3.x
6.50
Severity 3.x
MEDIUM
Vector 2.0
AV:A/AC:L/Au:N/C:N/I:P/A:N CVSS v2.0 Severity and Metrics:

Base Score: 3.30 LOW
Vector: AV:A/AC:L/Au:N/C:N/I:P/A:N

Attack Vector (AV): Adjacent
Attack Complexity (AC): Low
Authentication (Au): None
Confidentiality (C): None
Integrity (I): Physical
Availability (A): None

Base Score 2.0
3.30
Severity 2.0
LOW

Vulnerable products and versions

CPE From Up to
cpe:2.3:a:cisco:application_policy_infrastructure_controller:7.3\(0\)zn\(0.113\):*:*:*:*:*:*:*
cpe:2.3:h:cisco:9432pq:-:*:*:*:*:*:*:*
cpe:2.3:h:cisco:9536pq:-:*:*:*:*:*:*:*
cpe:2.3:h:cisco:9636pq:-:*:*:*:*:*:*:*
cpe:2.3:h:cisco:9736pq:-:*:*:*:*:*:*:*
cpe:2.3:h:cisco:n9k-x9432c-s:-:*:*:*:*:*:*:*
cpe:2.3:h:cisco:n9k-x9464px:-:*:*:*:*:*:*:*
cpe:2.3:h:cisco:n9k-x9464tx2:-:*:*:*:*:*:*:*
cpe:2.3:h:cisco:n9k-x9564px:-:*:*:*:*:*:*:*
cpe:2.3:h:cisco:n9k-x9564tx:-:*:*:*:*:*:*:*
cpe:2.3:h:cisco:n9k-x9636c-r:-:*:*:*:*:*:*:*
cpe:2.3:h:cisco:n9k-x9636c-rx:-:*:*:*:*:*:*:*
cpe:2.3:h:cisco:n9k-x97160yc-ex:-:*:*:*:*:*:*:*
cpe:2.3:h:cisco:n9k-x9732c-ex:-:*:*:*:*:*:*:*
cpe:2.3:h:cisco:n9k-x9732c-fx:-:*:*:*:*:*:*:*

To consult the complete list of CPE names with products and versions, see this page


References to Advisories, Solutions, and Tools