title: Junos OS: EX and QFX Series: Console port authentication bypass vulnerability
description: On Juniper Networks EX and QFX Series, an authentication bypass vulnerability may allow a user connected to the console port to login as root without any password. This issue might only occur in certain scenarios: • At the first reboot after performing device factory reset using the command “request system zeroize”; or • A temporary moment during the first reboot after the software upgrade when the device configured in Virtual Chassis mode. This issue affects Juniper Networks Junos OS on EX and QFX Series: 14.1X53 versions prior to 14.1X53-D53; 15.1 versions prior to 15.1R7-S4; 15.1X53 versions prior to 15.1X53-D593; 16.1 versions prior to 16.1R7-S4; 17.1 versions prior to 17.1R2-S11, 17.1R3-S1; 17.2 versions prior to 17.2R3-S3; 17.3 versions prior to 17.3R2-S5, 17.3R3-S6; 17.4 versions prior to 17.4R2-S9, 17.4R3; 18.1 versions prior to 18.1R3-S8; 18.2 versions prior to 18.2R2; 18.3 versions prior to 18.3R1-S7, 18.3R2. This issue does not affect Juniper Networks Junos OS 12.3.
problem types: CWE-288 Authentication Bypass Using an Alternate Path or Channel
affected:
{
platforms: EX and QFX Series
product: Junos OS
vendor: Juniper Networks
versions:
status: unaffected, version: 12.3
lessThan: 14.1X53-D53, status: affected, version: 14.1X53, versionType: custom
lessThan: 15.1R7-S4, status: affected, version: 15.1, versionType: custom
lessThan: 15.1X53-D593, status: affected, version: 15.1X53, versionType: custom
lessThan: 16.1R7-S4, status: affected, version: 16.1, versionType: custom
lessThan: 17.1R2-S11, 17.1R3-S1, status: affected, version: 17.1, versionType: custom
lessThan: 17.2R3-S3, status: affected, version: 17.2, versionType: custom
lessThan: 17.3R2-S5, 17.3R3-S6, status: affected, version: 17.3, versionType: custom
lessThan: 17.4R2-S9, 17.4R3, status: affected, version: 17.4, versionType: custom
lessThan: 18.1R3-S8, status: affected, version: 18.1, versionType: custom
lessThan: 18.2R2, status: affected, version: 18.2, versionType: custom
lessThan: 18.3R1-S7, 18.3R2, status: affected, version: 18.3, versionType: custom
}
metrics:
cvssV3_1: [
attackComplexity: HIGH
attackVector: PHYSICAL
availabilityImpact: HIGH
baseScore: 6.3
baseSeverity: MEDIUM
confidentialityImpact: HIGH
integrityImpact: HIGH
privilegesRequired: NONE
scope: UNCHANGED
userInteraction: REQUIRED
vectorString: CVSS:3.1/AV:P/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H
version: 3.1
]
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: 14.1X53-D53, 15.1X53-D593, 15.1R7-S4, 16.1R7-S4, 17.1R2-S11, 17.1R3-S1, 17.2R3-S3, 17.3R2-S5, 17.3R3-S6, 17.4R2-S9, 17.4R3, 18.1R3-S8, 18.2R2, 18.3R1-S7, 18.3R2, 18.4R1, and all subsequent releases.
workarounds: Limit physical access to the console port only to trusted administrators.