FortiOS DRBG unsufficient entropy (FG-IR-19-186)

high Nessus Plugin ID 130209
New! Plugin Severity Now Using CVSS v3

The calculated severity for Plugins has been updated to use CVSS v3 by default. Plugins that do not have a CVSS v3 score will fall back to CVSS v2 for calculating severity. Severity display preferences can be toggled in the settings dropdown.

Synopsis

The remote host is affected by an information disclosure vulnerability.

Description

An Insufficient Entropy in PRNG vulnerability in Fortinet FortiOS 6.2.1 and below for device not enable hardware TRNG token and models not support builtin TRNG seed allows attacker to theoretically recover the long term ECDSA secret in a TLS client with a RSA handshake and mutual ECDSA authentication via the help of flush+reload side channel attacks in FortiGate VM models only.

Solution

Upgrade to Fortinet FortiOS version 6.2.1 or later.

See Also

https://fortiguard.com/psirt/FG-IR-19-186

Plugin Details

Severity: High

ID: 130209

File Name: fortios_FG-IR-19-186.nasl

Version: 1.5

Type: local

Family: Firewalls

Published: 10/25/2019

Updated: 4/29/2021

Dependencies: fortinet_version.nbin

Configuration: Enable paranoid mode

Risk Information

CVSS Score Source: CVE-2019-15703

VPR

Risk Factor: Low

Score: 3.6

CVSS v2

Risk Factor: Low

Base Score: 2.6

Temporal Score: 1.9

Vector: AV:N/AC:H/Au:N/C:P/I:N/A:N

Temporal Vector: E:U/RL:OF/RC:C

CVSS v3

Risk Factor: High

Base Score: 7.5

Temporal Score: 6.5

Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

Temporal Vector: E:U/RL:O/RC:C

Vulnerability Information

CPE: cpe:/o:fortinet:fortios

Required KB Items: Host/Fortigate/model, Host/Fortigate/version, Settings/ParanoidReport

Exploit Ease: No known exploits are available

Patch Publication Date: 10/18/2019

Vulnerability Publication Date: 10/18/2019

Reference Information

CVE: CVE-2019-15703