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Schneider Electric Modicon M221 PLCs and SoMachine Basic Use of Hard-Coded Cryptographic Key (CVE-2017-7574)
critical Tenable OT Security Plugin ID 500298
Synopsis
The remote OT asset is affected by a vulnerability.Description
Schneider Electric SoMachine Basic 1.4 SP1 and Schneider Electric Modicon TM221CE16R 1.3.3.3 devices have a hardcoded- key vulnerability. The Project Protection feature is used to prevent unauthorized users from opening an XML protected project file, by prompting the user for a password. This XML file is AES-CBC encrypted; however, the key used for encryption (SoMachineBasicSoMachineBasicSoMa) cannot be changed. After decrypting the XML file with this key, the user password can be found in the decrypted data. After reading the user password, the project can be opened and modified with the Schneider product.This plugin only works with Tenable.ot. Please visit https://www.tenable.com/products/tenable-ot for more information.
Solution
The following text was originally created by the Cybersecurity and Infrastructure Security Agency (CISA). The original can be found at CISA.gov.Schneider Electric recommends that users store project files in secure, access-restricted locations and encrypt project files with reputable third party file encryption tools.
On June 14, 2017, Schneider Electric released firmware v1.5.1.0 and associated SoMachineBasic V1.5SP1. The new version uses an enhanced encryption mechanism and prevents M221 from returning the password. Users may download SoMachineBasic V1.5SP1 (including firmware v1.5.1.0) from the Schneider Electric web site at the following location:
http://www.schneider-electric.com/en/download/document/SOMBASAP15SP1SOFT/
or by using Schneider Electric Software Update tool.
Schneider Electric’s security notice SEVD-2017-097-01 is available at the following location:
http://www.schneider-electric.com/en/download/document/SEVD-2017-097-01/
Schneider Electric’s security notice SEVD-2017-097-02 is available at the following location:
http://www.schneider-electric.com/en/download/document/SEVD-2017-097-02/
See Also
https://os-s.net/advisories/OSS-2017-02.pdf
https://www.cisa.gov/news-events/ics-advisories/icsa-17-103-02a
http://www.securityfocus.com/bid/97518
Plugin Details
Severity: Critical
ID: 500298
Version: 1.9
Type: remote
Family: Tenable.ot
Published: 2/7/2022
Updated: 3/4/2024
Supported Sensors: Tenable OT Security
Risk Information
VPR
Risk Factor: Medium
Score: 5.9
CVSS v2
Risk Factor: High
Base Score: 7.5
Temporal Score: 5.5
Vector: CVSS2#AV:N/AC:L/Au:N/C:P/I:P/A:P
CVSS Score Source: CVE-2017-7574
CVSS v3
Risk Factor: Critical
Base Score: 9.8
Temporal Score: 8.5
Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Temporal Vector: CVSS:3.0/E:U/RL:O/RC:C
Vulnerability Information
CPE: cpe:/o:schneider-electric:modicon_tm221ce16r_firmware:1.3.3.3
Required KB Items: Tenable.ot/Schneider
Exploit Ease: No known exploits are available
Patch Publication Date: 4/6/2017
Vulnerability Publication Date: 4/6/2017
Reference Information
CVE: CVE-2017-7574
CWE: 798