title: vSRX Series: A local authentication vulnerability may lead to full control of a vSRX instance while the system is booting.
description: An authentication bypass vulnerability in the initial boot sequence of Juniper Networks Junos OS on vSRX Series may allow an attacker to gain full control of the system without authentication when the system is initially booted up. Affected releases are Juniper Networks Junos OS: 15.1X49 versions prior to 15.1X49-D30 on vSRX.
problem types: Authentication Bypass Using an Alternate Path or Channel
affected:
{
platforms: vSRX Series
product: Junos OS
vendor: Juniper Networks
versions:
lessThan: 15.1X49-D30, status: affected, version: 15.1X49, versionType: custom
}
metrics:
cvssV3_0: [
attackComplexity: LOW
attackVector: PHYSICAL
availabilityImpact: HIGH
baseScore: 6.8
baseSeverity: MEDIUM
confidentialityImpact: HIGH
integrityImpact: HIGH
privilegesRequired: NONE
scope: UNCHANGED
userInteraction: NONE
vectorString: CVSS:3.0/AV:P/AC:L/PR:N/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: Junos OS 15.1X49-D30, and all subsequent releases.
workarounds: There are no viable workarounds for this issue.
Methods which may reduce, but not eliminate, the risk for exploitation of this problem, and which does not resolve the underlying problem include:
• Restrict access to the hypervisor to only trusted administrators.
• Disallow all access to the 'physical instance' of the vSRX instance while it is initially booting by disabling connectivity to devices hosting the instance; e.g. console servers, etc.