title: Z/IP Gateway Use of Uninitialized PRNG when Generating S0 Encryption Key
description:
The first S0 encryption key is generated with an uninitialized PRNG in Z/IP Gateway products running Silicon Labs Z/IP Gateway SDK v7.18.3 and earlier. This makes the first S0 key generated at startup predictable, potentially allowing network key prediction and unauthorized S0 network access.
problem types: CWE-908 Use of Uninitialized Resource
affected:
{
defaultStatus: affected
product: Z/IP Gateway SDK
vendor: silabs.com
versions:
lessThanOrEqual: 7.18.3, status: affected, version: 0, versionType: LessThan
}
metrics:
cvssV3_1: [
attackComplexity: HIGH
attackVector: PHYSICAL
availabilityImpact: HIGH
baseScore: 6.4
baseSeverity: MEDIUM
confidentialityImpact: HIGH
integrityImpact: HIGH
privilegesRequired: NONE
scope: UNCHANGED
userInteraction: NONE
vectorString: CVSS:3.1/AV:P/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
version: 3.1
]
format: CVSS
scenarios: GENERAL