title: Junos OS: commit script may allow unauthenticated root login upon reboot
description: An unauthenticated root login may allow upon reboot when a commit script is used. A commit script allows a device administrator to execute certain instructions during commit, which is configured under the [system scripts commit] stanza. Certain commit scripts that work without a problem during normal commit may cause unexpected behavior upon reboot which can leave the system in a state where root CLI login is allowed without a password due to the system reverting to a "safe mode" authentication state. Lastly, only logging in physically to the console port as root, with no password, will work. Affected releases are Juniper Networks Junos OS: 12.1X46 versions prior to 12.1X46-D71 on SRX; 12.3X48 versions prior to 12.3X48-D55 on SRX; 14.1 versions prior to 14.1R9; 14.1X53 versions prior to 14.1X53-D40 on QFX, EX; 14.2 versions prior to 14.2R7-S9, 14.2R8; 15.1 versions prior to 15.1F5-S7, 15.1F6-S8, 15.1R5-S6, 15.1R6; 15.1X49 versions prior to 15.1X49-D110 on SRX; 15.1X53 versions prior to 15.1X53-D232 on QFX5200/5110; 15.1X53 versions prior to 15.1X53-D49, 15.1X53-D470 on NFX; 15.1X53 versions prior to 15.1X53-D65 on QFX10K; 16.1 versions prior to 16.1R2. No other Juniper Networks products or platforms are affected by this issue.
problem types: unauthenticated root access
affected:
{
platforms: SRX
product: Junos OS
vendor: Juniper Networks
versions:
lessThan: 12.1X46-D71, status: affected, version: 12.1X46, versionType: custom
lessThan: 12.3X48-D55, status: affected, version: 12.3X48, versionType: custom
lessThan: 15.1X49-D110 , status: affected, version: 15.1X49, versionType: custom
}
{
product: Junos OS
vendor: Juniper Networks
versions:
lessThan: 14.1R9, status: affected, version: 14.1, versionType: custom
lessThan: 14.2R7-S9, 14.2R8, status: affected, version: 14.2, versionType: custom
lessThan: 15.1F5-S7, 15.1F6-S8, 15.1R5-S6, 15.1R6, status: affected, version: 15.1, versionType: custom
lessThan: 16.1R2, status: affected, version: 16.1, versionType: custom
}
{
platforms: QFX, EX
product: Junos OS
vendor: Juniper Networks
versions:
lessThan: 14.1X53-D40, status: affected, version: 14.1X53, versionType: custom
}
{
platforms: QFX5200/5110
product: Junos OS
vendor: Juniper Networks
versions:
lessThan: 15.1X53-D232, status: affected, version: 15.1X53, versionType: custom
}
{
platforms: NFX
product: Junos OS
vendor: Juniper Networks
versions:
lessThan: 15.1X53-D49, 15.1X53-D470, status: affected, version: 15.1X53, versionType: custom
}
{
platforms: QFX10K
product: Junos OS
vendor: Juniper Networks
versions:
lessThan: 15.1X53-D65, status: affected, version: 15.1X53, versionType: custom
}
metrics:
cvssV3_0: [
attackComplexity: LOW
attackVector: PHYSICAL
availabilityImpact: HIGH
baseScore: 6.2
baseSeverity: MEDIUM
confidentialityImpact: HIGH
integrityImpact: HIGH
privilegesRequired: HIGH
scope: UNCHANGED
userInteraction: NONE
vectorString: CVSS:3.0/AV:P/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H
version: 3.0
]
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: 12.1X46-D71, 12.3X48-D55, 14.1R9, 14.1X53-D40, 14.2R7-S9, 14.2R8, 15.1F5-S7, 15.1R5-S6, 15.1R6, 15.1X49-D110, 15.1X53-D232, 15.1X53-D65, 16.1R2, 16.2R1 and all subsequent releases.
workarounds: While there is no published workaround for this issue, customer can verify whether their commit script contains the affected configuration by rebooting the device. Please contact JTAC if after the reboot the device enters a state where root CLI login is allowed without a password.