title: An issue has recently been discovered in Arista EOS where, under certain conditions, the service ACL configured for OpenConfig gNOI and OpenConfig RESTCONF might be bypassed, which results in the denied requests being forwarded to the agent.
description: An issue has recently been discovered in Arista EOS where, under certain conditions, the service ACL configured for OpenConfig gNOI and OpenConfig RESTCONF might be bypassed, which results in the denied requests being forwarded to the agent.
problem types: CWE-284 Improper Access Control
affected:
{
product: EOS
vendor: Arista Networks
versions:
status: affected, version: 4.22.x
lessThanOrEqual: 4.26.0, status: affected, version: 4.26.2F, versionType: custom
lessThanOrEqual: 4.25.5, status: affected, version: 4.25.5.1M, versionType: custom
lessThanOrEqual: 4.25.4, status: affected, version: 4.25.4M, versionType: custom
lessThanOrEqual: 4.25.0, status: affected, version: 4.25.3, versionType: custom
lessThanOrEqual: 4.24.0, status: affected, version: 4.24.7M, versionType: custom
lessThanOrEqual: 4.23.0, status: affected, version: 4.23.9M, versionType: custom
lessThanOrEqual: 4.21.x, status: affected, version: 4.21.x, versionType: custom
}
metrics:
cvssV3_1: [
attackComplexity: LOW
attackVector: NETWORK
availabilityImpact: NONE
baseScore: 5.5
baseSeverity: MEDIUM
confidentialityImpact: LOW
integrityImpact: HIGH
privilegesRequired: HIGH
scope: UNCHANGED
userInteraction: NONE
vectorString: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:L/I:H/A:N
version: 3.1
]
solutions: 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.
CVE-2021-28507 has been fixed in the following releases:
4.26.3M and later releases in the 4.26.x train
4.25.6M and later releases in the 4.25.x train
4.25.4.1M and later releases in the 4.25.4.x train
4.24.8M and later releases in the 4.24.x train
4.23.10M and later releases in the 4.23.x train
workarounds: On the affected versions, all vulnerabilities can be mitigated by disabling OpenConfig gNMI/gNOI and OpenConfig RESTCONF and TerminAttr. If use of these agents is required, a hotfix employing a proxy service can be deployed.