National Vulnerability Database

National Vulnerability Database

National Vulnerability
Database

CVE-2019-1890 Detail

Current 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.

Source:  MITRE
View Analysis Description

Impact

CVSS v3.0 Severity and Metrics:

Base Score: 6.5 MEDIUM
Vector: AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N (V3 legend)
Impact Score: 3.6
Exploitability Score: 2.8


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

CVSS v2.0 Severity and Metrics:

Base Score: 3.3 LOW
Vector: (AV:A/AC:L/Au:N/C:N/I:P/A:N) (V2 legend)
Impact Subscore: 2.9
Exploitability Subscore: 6.5


Access Vector (AV): Local_Network
Access Complexity (AC): Low
Authentication (AU): None
Confidentiality (C): None
Integrity (I): Partial
Availability (A): None
Additional Information:
Allows unauthorized modification

References to Advisories, Solutions, and Tools

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Hyperlink Resource
http://www.securityfocus.com/bid/109052 Third Party Advisory VDB Entry
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20190703-n9kaci-bypass Vendor Advisory

Technical Details

Vulnerability Type (View All)

  • Improper Access Control (CWE-284)

Known Affected Software Configurations Switch to CPE 2.2

Configuration 1 ( hide )
 cpe:2.3:a:cisco:application_policy_infrastructure_controller:7.3\(0\)zn\(0.113\):*:*:*:*:*:*:*
     Show Matching CPE(s)
Running on/with
 cpe:2.3:h:cisco:9432pq:-:*:*:*:*:*:*:*
     Show Matching CPE(s)
 cpe:2.3:h:cisco:9536pq:-:*:*:*:*:*:*:*
     Show Matching CPE(s)
 cpe:2.3:h:cisco:9636pq:-:*:*:*:*:*:*:*
     Show Matching CPE(s)
 cpe:2.3:h:cisco:9736pq:-:*:*:*:*:*:*:*
     Show Matching CPE(s)
 cpe:2.3:h:cisco:n9k-x9432c-s:-:*:*:*:*:*:*:*
     Show Matching CPE(s)
 cpe:2.3:h:cisco:n9k-x9464px:-:*:*:*:*:*:*:*
     Show Matching CPE(s)
 cpe:2.3:h:cisco:n9k-x9464tx2:-:*:*:*:*:*:*:*
     Show Matching CPE(s)
 cpe:2.3:h:cisco:n9k-x9564px:-:*:*:*:*:*:*:*
     Show Matching CPE(s)
 cpe:2.3:h:cisco:n9k-x9564tx:-:*:*:*:*:*:*:*
     Show Matching CPE(s)
 cpe:2.3:h:cisco:n9k-x9636c-r:-:*:*:*:*:*:*:*
     Show Matching CPE(s)
 cpe:2.3:h:cisco:n9k-x9636c-rx:-:*:*:*:*:*:*:*
     Show Matching CPE(s)
 cpe:2.3:h:cisco:n9k-x97160yc-ex:-:*:*:*:*:*:*:*
     Show Matching CPE(s)
 cpe:2.3:h:cisco:n9k-x9732c-ex:-:*:*:*:*:*:*:*
     Show Matching CPE(s)
 cpe:2.3:h:cisco:n9k-x9732c-fx:-:*:*:*:*:*:*:*
     Show Matching CPE(s)
 cpe:2.3:h:cisco:n9k-x9736c-ex:-:*:*:*:*:*:*:*
     Show Matching CPE(s)
 cpe:2.3:h:cisco:n9k-x9736c-fx:-:*:*:*:*:*:*:*
     Show Matching CPE(s)
 cpe:2.3:h:cisco:n9k-x9788tc-fx:-:*:*:*:*:*:*:*
     Show Matching CPE(s)
 cpe:2.3:h:cisco:nexus_92160yc-x:-:*:*:*:*:*:*:*
     Show Matching CPE(s)
 cpe:2.3:h:cisco:nexus_93108tc-ex:-:*:*:*:*:*:*:*
     Show Matching CPE(s)
 cpe:2.3:h:cisco:nexus_93108tc-fx:-:*:*:*:*:*:*:*
     Show Matching CPE(s)
 cpe:2.3:h:cisco:nexus_93120tx:-:*:*:*:*:*:*:*
     Show Matching CPE(s)
 cpe:2.3:h:cisco:nexus_9316d-gx:-:*:*:*:*:*:*:*
     Show Matching CPE(s)
 cpe:2.3:h:cisco:nexus_93180yc-ex:-:*:*:*:*:*:*:*
     Show Matching CPE(s)
 cpe:2.3:h:cisco:nexus_93180yc-fx:-:*:*:*:*:*:*:*
     Show Matching CPE(s)
 cpe:2.3:h:cisco:nexus_93216tc-fx2:-:*:*:*:*:*:*:*
     Show Matching CPE(s)
 cpe:2.3:h:cisco:nexus_93240yc-fx2:-:*:*:*:*:*:*:*
     Show Matching CPE(s)
 cpe:2.3:h:cisco:nexus_9332c:-:*:*:*:*:*:*:*
     Show Matching CPE(s)
 cpe:2.3:h:cisco:nexus_93360yc-fx2:-:*:*:*:*:*:*:*
     Show Matching CPE(s)
 cpe:2.3:h:cisco:nexus_9336c-fx2:-:*:*:*:*:*:*:*
     Show Matching CPE(s)
 cpe:2.3:h:cisco:nexus_9348gc-fxp:-:*:*:*:*:*:*:*
     Show Matching CPE(s)
 cpe:2.3:h:cisco:nexus_93600cd-gx:-:*:*:*:*:*:*:*
     Show Matching CPE(s)
 cpe:2.3:h:cisco:nexus_9364c:-:*:*:*:*:*:*:*
     Show Matching CPE(s)
 cpe:2.3:h:cisco:x9636q-r:-:*:*:*:*:*:*:*
     Show Matching CPE(s)


Change History

3 change records found - show changes

Quick Info

CVE Dictionary Entry:
CVE-2019-1890
NVD Published Date:
07/04/2019
NVD Last Modified:
07/11/2019