Vulnerability Description
A vulnerability in the implementation of Border Gateway Protocol (BGP) Message Digest 5 (MD5) authentication in Cisco NX-OS Software could allow an unauthenticated, remote attacker to bypass MD5 authentication and establish a BGP connection with the device. The vulnerability occurs because the BGP MD5 authentication is bypassed if the peer does not have MD5 authentication configured, the NX-OS device does have BGP MD5 authentication configured, and the NX-OS BGP virtual routing and forwarding (VRF) name is configured to be greater than 19 characters. An attacker could exploit this vulnerability by attempting to establish a BGP session with the NX-OS peer. A successful exploit could allow the attacker to establish a BGP session with the NX-OS device without MD5 authentication. The Cisco implementation of the BGP protocol accepts incoming BGP traffic only from explicitly configured peers. To exploit this vulnerability, an attacker must send the malicious packets over a TCP connection that appears to come from a trusted BGP peer. To do so, the attacker must obtain information about the BGP peers in the affected system’s trusted network.
CVSS Score
HIGH
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Cisco | Nx-Os | 9.2\(1\) |
| Cisco | Nexus 3016 | - |
| Cisco | Nexus 3048 | - |
| Cisco | Nexus 3064 | - |
| Cisco | Nexus 3064-T | - |
| Cisco | Nexus 31108Pc-V | - |
| Cisco | Nexus 31108Tc-V | - |
| Cisco | Nexus 31128Pq | - |
| Cisco | Nexus 3132C-Z | - |
| Cisco | Nexus 3132Q | - |
| Cisco | Nexus 3132Q-V | - |
| Cisco | Nexus 3132Q-Xl | - |
| Cisco | Nexus 3164Q | - |
| Cisco | Nexus 3172 | - |
| Cisco | Nexus 3172Pq-Xl | - |
| Cisco | Nexus 3172Tq | - |
| Cisco | Nexus 3172Tq-32T | - |
| Cisco | Nexus 3172Tq-Xl | - |
| Cisco | Nexus 3232C | - |
| Cisco | Nexus 3264C-E | - |
Related Weaknesses (CWE)
References
- https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-2Vendor Advisory
- https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-2Vendor Advisory
FAQ
What is CVE-2020-3165?
CVE-2020-3165 is a vulnerability with a CVSS score of 8.2 (HIGH). A vulnerability in the implementation of Border Gateway Protocol (BGP) Message Digest 5 (MD5) authentication in Cisco NX-OS Software could allow an unauthenticated, remote attacker to bypass MD5 authe...
How severe is CVE-2020-3165?
CVE-2020-3165 has been rated HIGH with a CVSS base score of 8.2/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2020-3165?
Check the references section above for vendor advisories and patch information. Affected products include: Cisco Nx-Os, Cisco Nexus 3016, Cisco Nexus 3048, Cisco Nexus 3064, Cisco Nexus 3064-T.