Cisco NX-OS 9.3 on Nexus 3000/Nexus 900 Port Channel ACL access control

Summaryinfo

A vulnerability identified as critical has been detected in Cisco NX-OS 9.3 on Nexus 3000/Nexus 900. This affects an unknown function of the component Port Channel ACL. The manipulation leads to access control. This vulnerability is documented as CVE-2024-20291. The attack can be initiated remotely. There is not any exploit available. You should upgrade the affected component.

Detailsinfo

A vulnerability was found in Cisco NX-OS 9.3 on Nexus 3000/Nexus 900 (Router Operating System). It has been rated as critical. This issue affects some unknown functionality of the component Port Channel ACL. The manipulation with an unknown input leads to a access control vulnerability. Using CWE to declare the problem leads to CWE-284. The product does not restrict or incorrectly restricts access to a resource from an unauthorized actor. Impacted is integrity. The summary by CVE is:

A vulnerability in the access control list (ACL) programming for port channel subinterfaces of Cisco Nexus 3000 and 9000 Series Switches in standalone NX-OS mode could allow an unauthenticated, remote attacker to send traffic that should be blocked through an affected device. This vulnerability is due to incorrect hardware programming that occurs when configuration changes are made to port channel member ports. An attacker could exploit this vulnerability by attempting to send traffic through an affected device. A successful exploit could allow the attacker to access network resources that should be protected by an ACL that was applied on port channel subinterfaces.

The weakness was released 02/28/2024 as cisco-sa-nxos-po-acl-TkyePgvL. It is possible to read the advisory at sec.cloudapps.cisco.com. The identification of this vulnerability is CVE-2024-20291 since 11/08/2023. The technical details are unknown and an exploit is not publicly available. The pricing for an exploit might be around USD $5k-$25k at the moment (estimation calculated on 02/28/2024). The attack technique deployed by this issue is T1068 according to MITRE ATT&CK.

Upgrading eliminates this vulnerability.

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Productinfo

Type

• Router Operating System

Vendor

• Cisco

Name

• NX-OS

Version

• 9.3

License

• commercial

Website

• Vendor: https://www.cisco.com/

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