title: Junos OS Evolved: PTX10001, PTX10004, PTX10008, PTX10016: MAC address validation bypass vulnerability
description:
An Origin Validation vulnerability in MAC address validation of Juniper Networks Junos OS Evolved on PTX10001, PTX10004, PTX10008, and PTX10016 devices allows a network-adjacent attacker to bypass MAC address checking, allowing MAC addresses not intended to reach the adjacent LAN to be forwarded to the downstream network. Due to this issue, the router will start forwarding traffic if a valid route is present in forwarding-table, causing a loop and congestion in the downstream layer-2 domain connected to the device.
This issue affects Juniper Networks Junos OS Evolved on PTX10001, PTX10004, PTX10008, and PTX10016:
*  All versions prior to 21.4R3-S5-EVO;
*  22.1 versions prior to 22.1R3-S4-EVO;
*  22.2 versions 22.2R1-EVO and later;
*  22.3 versions prior to 22.3R2-S2-EVO, 22.3R3-S1-EVO;
*  22.4 versions prior to 22.4R2-S1-EVO, 22.4R3-EVO;
*  23.2 versions prior to 23.2R1-S1-EVO, 23.2R2-EVO.
problem types: CWE-346 Origin Validation Error
affected:
{
defaultStatus: unaffected
platforms: [PTX10001, PTX10004, PTX10008, PTX10016]
product: Junos OS Evolved
vendor: Juniper Networks
versions:
lessThan: 21.4R3-S5-EVO, status: affected, version: 0, versionType: semver
lessThan: 22.1R3-S4-EVO, status: affected, version: 22.1, versionType: semver
lessThan: 22.2*-EVO, status: affected, version: 22.2R1-EVO, versionType: semver
lessThan: 22.3R2-S2-EVO, 22.3R3-S1-EVO, status: affected, version: 22.3, versionType: semver
lessThan: 22.4R2-S1-EVO, 22.4R3-EVO, status: affected, version: 22.4, versionType: semver
lessThan: 23.2R1-S1-EVO, 23.2R2-EVO, status: affected, version: 23.2, versionType: semver
}
metrics:
cvssV3_1: [
attackComplexity: LOW
attackVector: ADJACENT_NETWORK
availabilityImpact: LOW
baseScore: 6.1
baseSeverity: MEDIUM
confidentialityImpact: NONE
integrityImpact: LOW
privilegesRequired: NONE
scope: CHANGED
userInteraction: NONE
vectorString: CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:L
version: 3.1
]
format: CVSS
scenarios: GENERAL
exploits: Juniper SIRT is not aware of any malicious exploitation of this vulnerability.
solutions: The following software releases have been updated to resolve this specific issue: Junos OS Evolved 21.4R3-S5-EVO, 22.1R3-S4-EVO, 22.3R2-S2-EVO, 22.3R3-S1-EVO, 22.4R2-S1-EVO, 22.4R3-EVO, 23.2R1-S1-EVO, 23.2R2-EVO, 23.3R1-EVO, and all subsequent releases.
workarounds: There are no known workarounds for this issue.