Cisco NX-OS Software IPv6 Access Control List Bypass (cisco-sa-ipv6-acl-CHgdYk8j)

medium Nessus Plugin ID 146481

Synopsis

The remote device is missing a vendor-supplied security patch

Description

A vulnerability in the IPv6 traffic processing of Cisco NX-OS Software for certain Cisco devices could allow an unauthenticated, remote attacker to bypass an IPv6 access control list (ACL) that is configured for an interface of an affected device. The vulnerability is due to improper processing of IPv6 traffic that is sent through an affected device. An attacker could exploit this vulnerability by sending crafted IPv6 packets that traverse the affected device.
A successful exploit could allow the attacker to access resources that would typically be protected by the interface ACL.

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 CSCvv45698

See Also

http://www.nessus.org/u?76e17295

https://bst.cloudapps.cisco.com/bugsearch/bug/CSCvv45698

Plugin Details

Severity: Medium

ID: 146481

File Name: cisco-sa-ipv6-acl-CHgdYk8j.nasl

Version: 1.6

Type: combined

Family: CISCO

Published: 2/12/2021

Updated: 5/10/2021

Supported Sensors: Nessus

Risk Information

VPR

Risk Factor: Low

Score: 2.5

CVSS v2

Risk Factor: Medium

Base Score: 6.4

Temporal Score: 4.7

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

CVSS Score Source: CVE-2021-1389

CVSS v3

Risk Factor: Medium

Base Score: 6.5

Temporal Score: 5.7

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

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: 2/3/2021

Vulnerability Publication Date: 2/3/2021

Reference Information

CVE: CVE-2021-1389

CWE: 284

CISCO-SA: cisco-sa-ipv6-acl-CHgdYk8j

IAVA: 2021-A-0073

CISCO-BUG-ID: CSCvv45698