CVE-2019-1890 Cisco Nexus 9000 Series Fabric Switches ACI Mode Fabric Infrastructure VLAN Unauthorized Access Vulnerability
An adjacent attacker can bypass LLDP security checks to connect an unauthorized server to the privileged infrastructure VLAN, gaining access to APIC services.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2019-1890?
CVE-2019-1890 is a high-severity authentication bypass vulnerability in Cisco NX-OS System Software in ACI Mode 11.0.1b, published on 4 Jul 2019. It can only be exploited from the same machine or local network, with no action from the victim.
Official 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.
Weakness: CWE-284
Which versions are affected by CVE-2019-1890?
It affects 1 product.
Products include Cisco Application Policy Infrastructure Controller.
How do I fix CVE-2019-1890?
No fix has been published for CVE-2019-1890 yet. Limit exposure of the affected software until one is available.
Upgrade, and rotate credentials and sessions that may have been exposed. More about Authentication bypass.
Is CVE-2019-1890 being exploited?
There is no known exploitation of CVE-2019-1890 in the wild and no public exploit code.
Other vulnerabilities in Cisco NX-OS System Software in ACI Mode 11.0.1b
- CVE-2021-1393 Cisco Application Services Engine Unauthorized Access Vulnerabilities
- CVE-2021-1396 Cisco Application Services Engine Unauthorized Access Vulnerabilities
- CVE-2021-1577 Cisco Application Policy Infrastructure Controller Arbitrary File Read and Write Vulnerability
- CVE-2023-20011 Cross-site request forgery in Cisco Application Policy Infrastructure Controller (APIC)
- CVE-2021-1578 Cisco Application Policy Infrastructure Controller Privilege Escalation Vulnerability
Sources
Also known as GHSA-6gv5-cvcq-3x2c.