Uninitialized PRNG in Z/IP Gateway Products: Predictable S0 Encryption Key Vulnerability

Uninitialized PRNG in Z/IP Gateway Products: Predictable S0 Encryption Key Vulnerability

CVE-2023-4489 · CRITICAL Severity

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

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.

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