Date: May 21, 2024
Revision | Date | Changes |
---|---|---|
1.0 | May 21, 2024 | Initial release |
The CVE-ID tracking this issue: CVE-2023-5502
CVSSv3.1 Base Score: 5.9 (CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N)
Common Weakness Enumeration: CWE-287 Improper Access Control
This vulnerability is being tracked by BUG 862986
On affected platforms running Arista EOS with 802.1x authentication configured on the access/trunk ports, and routing enabled on the access VLAN of the ports, a malicious supplicant may be able to bypass the requirement to perform 802.1x authentication.
This issue was discovered internally and Arista is not aware of any malicious uses of this issue in customer networks.
EOS versions from 4.17.0 onwards are affected including the following supported release trains:
The following products are affected by this vulnerability:
Arista EOS-based products:
7020R Series
7280R/R2 Series
7500R/R2 Series
7280E Series
7500E Series
The following product versions and platforms are not affected by this vulnerability:
Arista EOS-based products:
Arista Wireless Access Points
CloudVision CUE, virtual appliance or physical appliance
CloudVision CUE cloud service delivery
CloudVision eXchange, virtual or physical appliance
CloudVision Portal, virtual appliance or physical appliance
CloudVision as-a-Service
CloudVision AGNI
Arista 7130 Systems running MOS
Arista Converged Cloud Fabric and DANZ Monitoring Fabric (Formerly Big Switch Nodes for BCF and BMF)
Arista Network Detection and Response (NDR) Security Platform (Formerly Awake NDR)
Arista Edge Threat Management - Arista NG Firewall and Arista Micro Edge (Formerly Untangle)
In order to be vulnerable to CVE-2023-5502, either of the following conditions must be met:
1. Dot1x authentication must be configured:
Global command to enable dot1x:
dot1x system-auth-control
interface Ethernet1
dot1x pae authenticator
dot1x port-control auto
!! One of the two configuration lines below MUST be set
dot1x host-mode single-host
dot1x host-mode multi-host authenticated
interface Vlan100
ip address 1.1.1.1/24
ip routing
2. There is a second vulnerable configuration where 802.1x is configured in any host mode with MBA as shown below:
dot1x system-auth-control
interface Ethernet1
dot1x pae authenticator
dot1x port-control auto
dot1x mac based authentication
!! One of the three configuration lines below MUST be set
dot1x host-mode single-host
dot1x host-mode multi-host authenticated
dot1x host-mode multi-host
interface Vlan100
ip address 1.1.1.1/24
ip routing
There is no indicators of compromise for this vulnerability
Mitigation of this vulnerability requires disabling dot1x.
Dot1x can be disabled globally using the following command
no dot1x system-auth-control
The recommended resolution is to upgrade to a remediated software version at your earliest convenience. Arista recommends customers move to the latest version of each release that contains all the fixes listed below. For more information about upgrading see EOS User Manual: Upgrades and Downgrades
CVE-2023-5502 has been fixed in the following releases:
No hotfixes are available.
If you require further assistance, or if you have any further questions regarding this security notice, please contact the Arista Networks Technical Assistance Center (TAC) by one of the following methods:
By email: This email address is being protected from spambots. You need JavaScript enabled to view it.
By telephone: 408-547-5502 ; 866-476-0000
Contact information needed to open a new service request may be found at: https://www.arista.com/en/support/customer-support