Cisco NX-OS Software VXLAN OAM DoS (cisco-sa-nxos-ngoam-dos-LTDb9Hv)

high Nessus Plugin ID 152877

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Synopsis

The remote device is missing a vendor-supplied security patch

Description

A denial of service (DoS) vulnerability exists in the VXLAN Operation, Administration, and Maintenance (OAM) feature of Cisco NX-OS Software, known as NGOAM, due to an improper handling of specific packets with a Transparent Interconnection of Lots of Links (TRILL) OAM EtherType. An unauthenticated, remote attacker can exploit this issue by sending crafted packets, including the TRILL OAM EtherType of 0x8902, to a device that is part of a VXLAN Ethernet VPN (EVPN) fabric causing the affected device to experience high CPU usage and consume excessive system resources.

Note: Please see the included Cisco BIDs and Cisco Security Advisory for more information.

Solution

Upgrade to the relevant fixed version referenced in Cisco bug ID CSCvx66917

Plugin Details

Severity: High

ID: 152877

File Name: cisco-sa-nxos-ngoam-dos-LTDb9Hv.nasl

Version: 1.9

Type: combined

Family: CISCO

Published: 8/27/2021

Updated: 7/22/2024

Supported Sensors: Nessus

Risk Information

VPR

Risk Factor: Medium

Score: 4.4

CVSS v2

Risk Factor: Medium

Base Score: 4.3

Temporal Score: 3.2

Vector: CVSS2#AV:N/AC:M/Au:N/C:N/I:N/A:P

CVSS Score Source: CVE-2021-1587

CVSS v3

Risk Factor: High

Base Score: 8.6

Temporal Score: 7.5

Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H

Temporal Vector: CVSS:3.0/E:U/RL:O/RC:C

Vulnerability Information

CPE: cpe:/o:cisco:nx-os

Required KB Items: Host/Cisco/NX-OS/Version, Host/Cisco/NX-OS/Model, Host/Cisco/NX-OS/Device

Exploit Ease: No known exploits are available

Patch Publication Date: 8/25/2021

Vulnerability Publication Date: 8/25/2021

Reference Information

CVE: CVE-2021-1587

CWE: 115

CISCO-SA: cisco-sa-nxos-ngoam-dos-LTDb9Hv

IAVA: 2021-A-0398

CISCO-BUG-ID: CSCvx66917

Detections

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