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Cisco Nexus 9000 Series Fabric Switches ACI Mode Queue Wedge DoS (cisco-sa-n9kaci-queue-wedge-cLDDEfKF)

high Nessus Plugin ID 158207

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Synopsis

The remote device is missing a vendor-supplied security patch

Description

According to its self-reported version, Cisco NX-OS System Software in ACI Mode is affected by a denial of service vulnerability. The vulnerability exists in Cisco Nexus 9000 Series Fabric Switches in Application Centric Infrastructure (ACI) mode.
An unauthenticated, remote attacker can exploit this by sending a stream of TCP packets to a specific port on a Switched Virtual Interface (SVI) configured on the device to cause a specific packet queue to queue network buffers but never process them, leading to an eventual queue wedge. This could cause control plane traffic to be dropped, resulting in a denial of service (DoS) condition where the leaf switches are unavailable.

Note: This vulnerability requires a manual intervention to power-cycle the device to recover.

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 CSCvx14142

See Also

http://www.nessus.org/u?8c4051f9

http://tools.cisco.com/security/center/viewErp.x?alertId=ERP-74640

https://bst.cloudapps.cisco.com/bugsearch/bug/CSCvx14142

Plugin Details

Severity: High

ID: 158207

File Name: cisco-sa-n9kaci-queue-wedge-cLDDEfKF.nasl

Version: 1.5

Type: combined

Family: CISCO

Published: 2/21/2022

Updated: 2/22/2022

Supported Sensors: Nessus

Risk Information

VPR

Risk Factor: Medium

Score: 4.4

CVSS v2

Risk Factor: Medium

Base Score: 5

Temporal Score: 3.7

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

CVSS Score Source: CVE-2021-1523

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, Host/aci/system/chassis/summary

Exploit Ease: No known exploits are available

Patch Publication Date: 8/25/2021

Vulnerability Publication Date: 8/25/2021

Reference Information

CVE: CVE-2021-1523