Detections
Analytics

Siemens SIMATIC S7-400 CPUs Denial of Service

high Nessus Network Monitor Plugin ID 720146

Synopsis

Siemens SIMATIC S7-400 CPUs improperly validate S7 communication packets which could cause a Denial-of-Service condition.

Description

A vulnerability has been identified in SIMATIC S7-400 (incl. F) CPU hardware version 4.0 and below (All versions), SIMATIC S7-400 (incl. F) CPU hardware version 5.0 (All firmware versions < V5.2), SIMATIC S7-400H CPU hardware version 4.5 and below (All versions). The affected CPUs improperly validate S7 communication packets which could cause a Denial-of-Service condition of the CPU. The CPU will remain in DEFECT mode until manual restart.

Solution

Perform vendor recommended mitigations and apply available vendor upgrades.

See Also

http://www.securityfocus.com/bid/104217,https://www.siemens.com/global/en/home/products/services/cert.html#SecurityPublications,https://ics-cert.us-cert.gov/advisories/ICSA-18-137-03,https://cert-portal.siemens.com/productcert/pdf/ssa-914382.pdf

Plugin Details

Severity: High

ID: 720146

Family: SCADA

Published: 5/8/2019

Updated: 9/30/2019

Risk Information

VPR

Risk Factor: Low

Score: 3.6

CVSS v2

Risk Factor: Medium

Base Score: 5

Temporal Score: 3.7

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

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:N/I:N/A:H

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

Vulnerability Information

Patch Publication Date: 5/17/2018

Vulnerability Publication Date: 5/17/2018

Reference Information

CVE: CVE-2018-4850

BID: 104217