Cisco NX-OS Software Unidirectional Link Detection DoS / Code Execution (cisco-sa-nxos-udld-rce-xetH6w35)

high Nessus Plugin ID 149719
New! Plugin Severity Now Using CVSS v3

The calculated severity for Plugins has been updated to use CVSS v3 by default. Plugins that do not have a CVSS v3 score will fall back to CVSS v2 for calculating severity. Severity display preferences can be toggled in the settings dropdown.

Synopsis

The remote device is missing a vendor-supplied security patch

Description

An arbitrary code execution or denial of service (DoS) vulnerability exists in Unidirectional Link Detection (UDLD) feature of Cisco NX-OS Software due to insufficient input validation. An unauthenticated, adjacent attacker can exploit this issue by sending crafted Cisco UDLD protocol packets to a directly connected, affected device, to cause the device to reload, resulting in a DoS condition or arbitrary code execution.

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

Solution

Upgrade to the relevant fixed version referenced in Cisco bug IDs CSCvv78238, CSCvv96088, CSCvv96090, CSCvv96107, CSCvw38964, CSCvw38981, CSCvw38982, CSCvw38983, CSCvw38995, CSCvw45654

See Also

http://www.nessus.org/u?1b37d5dc

https://bst.cloudapps.cisco.com/bugsearch/bug/CSCvv78238

https://bst.cloudapps.cisco.com/bugsearch/bug/CSCvv96088

https://bst.cloudapps.cisco.com/bugsearch/bug/CSCvv96090

https://bst.cloudapps.cisco.com/bugsearch/bug/CSCvv96107

https://bst.cloudapps.cisco.com/bugsearch/bug/CSCvw38964

https://bst.cloudapps.cisco.com/bugsearch/bug/CSCvw38981

https://bst.cloudapps.cisco.com/bugsearch/bug/CSCvw38982

https://bst.cloudapps.cisco.com/bugsearch/bug/CSCvw38983

https://bst.cloudapps.cisco.com/bugsearch/bug/CSCvw38995

https://bst.cloudapps.cisco.com/bugsearch/bug/CSCvw45654

Plugin Details

Severity: High

ID: 149719

File Name: cisco-sa-nxos-udld-rce-xetH6w35.nasl

Version: 1.9

Type: combined

Family: CISCO

Published: 5/19/2021

Updated: 7/26/2021

Dependencies: cisco_nxos_version.nasl, cisco_enum_smu.nasl

Risk Information

CVSS Score Source: CVE-2021-1368

VPR

Risk Factor: Medium

Score: 5.9

CVSS v2

Risk Factor: Medium

Base Score: 4.9

Temporal Score: 3.6

Vector: AV:A/AC:M/Au:S/C:P/I:P/A:P

Temporal Vector: E:U/RL:OF/RC:C

CVSS v3

Risk Factor: High

Base Score: 8.8

Temporal Score: 7.7

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

Temporal Vector: 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: 2/24/2021

Vulnerability Publication Date: 2/24/2021

Reference Information

CVE: CVE-2021-1368