Detections
Analytics

Schneider Electric Modicon M241 and M251 PLCs Insufficiently Random Values

critical Nessus Network Monitor Plugin ID 720114

Synopsis

A Use of Insufficiently Random Values issue was discovered in Schneider Electric Modicon PLCs.

Description

A Use of Insufficiently Random Values issue was discovered in Schneider Electric Modicon PLCs Modicon M241, firmware versions prior to Version 4.0.5.11, and Modicon M251, firmware versions prior to Version 4.0.5.11. The session numbers generated by the web application are lacking randomization and are shared between several users. This may allow a current session to be compromised.

Solution

Perform vendor recommended mitigations and apply available vendor upgrades.

See Also

http://www.securityfocus.com/bid/97254,https://www.exploit-db.com/exploits/45918/,https://ics-cert.us-cert.gov/advisories/ICSA-17-089-02

Plugin Details

Severity: Critical

ID: 720114

Family: SCADA

Published: 5/8/2019

Updated: 9/30/2019

Risk Information

VPR

Risk Factor: Medium

Score: 6.0

CVSS v2

Risk Factor: Medium

Base Score: 6.4

Temporal Score: 5

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

CVSS v3

Risk Factor: Critical

Base Score: 9.1

Temporal Score: 8.2

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

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

Vulnerability Information

Patch Publication Date: 3/30/2017

Vulnerability Publication Date: 3/30/2017

Reference Information

CVE: CVE-2017-6026

BID: 97254