PT-2020-1985 · Cisco · Cisco Nx-Os+1

Jens Krabbenhoeft · Published 2020-02-26 · Updated 2020-03-03 · CVE-2020-3174

Positive Technologies (AI Summary)

CVSS v3.1

4.7

Medium

Base vector

AV:A/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:N

Name of the Vulnerable Software and Affected Versions Cisco NX-OS Software (affected versions not specified)

Description The issue is related to insufficient data authentication in the anycast gateway feature of Cisco NX-OS Software. This could allow an unauthenticated, adjacent attacker to cause a device to learn invalid Address Resolution Protocol (ARP) entries for nonlocal IP addresses on the subnet. The vulnerability is due to improper validation of a received gratuitous ARP (GARP) request. An attacker could exploit this by sending a malicious GARP packet on the local subnet, causing the ARP table on the device to become corrupted. This could lead to traffic disruptions by allowing the attacker to populate the ARP table with incorrect entries.

Recommendations At the moment, there is no information about a newer version that contains a fix for this vulnerability.

Insufficient Verification of Data Authenticity

Weakness Enumeration

CWE-345

Related Identifiers

BDU:2020-01302

CVE-2020-3174

Affected Products

Cisco Nx-Os

Cisco Nexus

References · 6

• https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20200226-nxos-arp · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2020-3174 · Security Note
• https://bdu.fstec.ru/vul/2020-01302 · Security Note
• https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20200226-nxos-arp · Vendor Advisory
• https://osv.dev/vulnerability/CVE-2020-3174 · Vendor Advisory
• https://cxsecurity.com/cveshow/CVE-2020-3174 · Note