title: An issue has recently been discovered in Arista EOS where the incorrect use of EOS's AAA API’s by the OpenConfig and TerminAttr agents could result in unrestricted access to the device for local users with nopassword configuration.
description: An issue has recently been discovered in Arista EOS where the incorrect use of EOS's AAA API’s by the OpenConfig and TerminAttr agents could result in unrestricted access to the device for local users with nopassword configuration.
problem types: CWE-285 Improper Authorization
affected:
{
product: Arista EOS
vendor: Arista Networks
versions:
lessThanOrEqual: 4.26.0, status: affected, version: 4.26.1F, versionType: custom
lessThanOrEqual: 4.25.0, status: affected, version: 4.25.4.M, versionType: custom
lessThanOrEqual: 4.24.6.0, status: affected, version: 4.24.6M, versionType: custom
lessThanOrEqual: 4.23.0, status: affected, version: 4.23.8M, versionType: custom
lessThanOrEqual: 4.22.0, status: affected, version: 4.22.11M, versionType: custom
lessThanOrEqual: 4.21.0, status: affected, version: 4.21.14M, versionType: custom
lessThan: 0, status: affected, version: 4.20, versionType: custom
}
metrics:
cvssV3_1: [
attackComplexity: LOW
attackVector: NETWORK
availabilityImpact: HIGH
baseScore: 9.1
baseSeverity: CRITICAL
confidentialityImpact: NONE
integrityImpact: HIGH
privilegesRequired: NONE
scope: UNCHANGED
userInteraction: NONE
vectorString: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H
version: 3.1
]
solutions: The recommended resolution is to upgrade to a remediated software version at your earliest convenience. Artista recommends customers move to the latest version of each release that contains all the fixes listed below.
CVE-2021-28500 has been fixed in the following releases:
4.26.2F and later releases in the 4.26.x train
4.25.5M and later releases in the 4.25.x train
4.25.4.1M and later releases in the 4.25.4.x train
4.24.7M and later releases in the 4.24.x train
4.23.9M and later releases in the 4.23.x train
4.22.12M and later releases in the 4.22.x train
4.21.15M and later releases in the 4.21.x train
workarounds: For local users whose authentication is with nopassword, enforce a password or remove the user. Ensure that the following configuration does not exist where a local user is configured with nopassword.