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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
Source: MITRE
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
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
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Vulnerability Type (View All)
AND OR *cpe:2.3:a:cisco:application_policy_infrastructure_controller:7.3\(0\)zn\(0.113\):*:*:*:*:*:*:* OR 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:
(AV:A/AC:L/Au:N/C:N/I:P/A:N)
AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
CWE-284
http://www.securityfocus.com/bid/109052 No Types Assigned
http://www.securityfocus.com/bid/109052 Third Party Advisory, VDB Entry
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20190703-n9kaci-bypass No Types Assigned
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20190703-n9kaci-bypass Vendor Advisory
http://www.securityfocus.com/bid/109052 [No Types Assigned]
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 vulner