Schneider Electric Modicon PLCs Predictable Value Range

critical Nessus Network Monitor Plugin ID 720116

Synopsis

A Predictable Value Range from Previous Values issue was discovered in Schneider Electric Modicon PLCs.

Description

A Predictable Value Range from Previous Values issue was discovered in Schneider Electric Modicon PLCs Modicon M221, firmware versions prior to Version 1.5.0.0, Modicon M241, firmware versions prior to Version 4.0.5.11, and Modicon M251, firmware versions prior to Version 4.0.5.11. The affected products generate insufficiently random TCP initial sequence numbers that may allow an attacker to predict the numbers from previous values. This may allow an attacker to spoof or disrupt TCP connections.

Solution

Perform vendor recommended mitigations and apply available vendor upgrades.

Plugin Details

Severity: Critical

ID: 720116

Family: SCADA

Published: 5/8/2019

Updated: 9/30/2019

Risk Information

VPR

Risk Factor: Low

Score: 2.5

CVSS v2

Risk Factor: Medium

Base Score: 6.4

Temporal Score: 4.7

Vector: CVSS2#AV:N/AC:L/Au:N/C:P/I:N/A:P

CVSS v3

Risk Factor: Critical

Base Score: 9.1

Temporal Score: 7.9

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

Temporal Vector: CVSS:3.0/E:U/RL:O/RC:C

Vulnerability Information

Patch Publication Date: 3/30/2017

Vulnerability Publication Date: 3/30/2017

Reference Information

CVE: CVE-2017-6030

BID: 97254

Detections

Analytics