Cisco NX-OS Software Link Layer Discovery Protocol DoS (cisco-sa-nxos-lldp-dos-z7PncTgt)

medium Nessus Plugin ID 191647

Synopsis

The remote device is missing a vendor-supplied security patch

Description

According to its self-reported version, Cisco NX-OS System Software is affected by a denial of service (DoS) vulnerability. The vulnerability lies in the Link Layer Discovery Protocol (LLDP) feature of Cisco NX-OS Software and could allow an unauthenticated, adjacent attacker to cause a denial of service (DoS) condition on an affected device.
This vulnerability is due to improper handling of specific fields in an LLDP frame. An attacker could exploit this vulnerability by sending a crafted LLDP packet to an interface of an affected device and having an authenticated user retrieve LLDP statistics from the affected device through CLI show commands or Simple Network Management Protocol (SNMP) requests. A successful exploit could allow the attacker to cause the LLDP service to crash and stop running on the affected device. In certain situations, the LLDP crash may result in a reload of the affected device. Note: LLDP is a Layer 2 link protocol. To exploit this vulnerability, an attacker would need to be directly connected to an interface of an affected device, either physically or logically (for example, through a Layer 2 Tunnel configured to transport the LLDP protocol).

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

Solution

Upgrade to the relevant fixed version referenced in Cisco bug IDs CSCwe86457, CSCwf67408, CSCwf67409, CSCwf67411, CSCwf67412, CSCwf67468, CSCwi29934, CSCwi31871

See Also

http://www.nessus.org/u?789ffa5c

http://www.nessus.org/u?e327a04a

https://bst.cloudapps.cisco.com/bugsearch/bug/CSCwe86457

https://bst.cloudapps.cisco.com/bugsearch/bug/CSCwf67408

https://bst.cloudapps.cisco.com/bugsearch/bug/CSCwf67409

https://bst.cloudapps.cisco.com/bugsearch/bug/CSCwf67411

https://bst.cloudapps.cisco.com/bugsearch/bug/CSCwf67412

https://bst.cloudapps.cisco.com/bugsearch/bug/CSCwf67468

https://bst.cloudapps.cisco.com/bugsearch/bug/CSCwi29934

https://bst.cloudapps.cisco.com/bugsearch/bug/CSCwi31871

Plugin Details

Severity: Medium

ID: 191647

File Name: cisco-sa-nxos-lldp-dos-z7PncTgt.nasl

Version: 1.2

Type: combined

Family: CISCO

Published: 3/6/2024

Updated: 3/8/2024

Supported Sensors: Nessus

Risk Information

VPR

Risk Factor: Medium

Score: 4.4

CVSS v2

Risk Factor: Medium

Base Score: 6.1

Temporal Score: 4.5

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

CVSS Score Source: CVE-2024-20294

CVSS v3

Risk Factor: Medium

Base Score: 6.6

Temporal Score: 5.8

Vector: CVSS:3.0/AV:A/AC:L/PR:N/UI:R/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: 2/28/2024

Vulnerability Publication Date: 2/28/2024

Reference Information

CVE: CVE-2024-20294