This security advisory describes one high risk vulnerability.

1) Use of hard-coded credentials

Severity: High

CVSSv3:
7.1 [CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:H/A:N/E:U/RL:O/RC:C] [PCI]

CVE-ID:
CVE-2020-3165

CWE-ID:
CWE-798 – Use of Hard-coded Credentials

Description


The vulnerability allows a remote attacker to bypass MD5 authentication and establish a BGP connection with the device.


The vulnerability exists when the Border Gateway Protocol (BGP) Message Digest 5 (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. A remote unauthenticated attacker can establish a BGP session with the NX-OS device without MD5 authentication.

Mitigation

Install updates from vendor’s website.

Vulnerable software versions

Cisco NX-OS:
9.2(1), 9.2(2), 9.2(3), 9.3(1)

Cisco Nexus 3000 Series Switches:

Cisco Nexus 9000 Series Switches NX-OS Mode:

CPE
External links

https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20200226-nxos-bgpmd5

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.





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