SCADA Vulnerabilities & Exposures (SVE)

CRITIFENCE® SCADA Vulnerabilities and Exposures Database (SVE)

[SVE-128522343] Schneider Electric Modicon PLCs

Date Type Platform Author EDB-ID CVE-ID OSVDB-ID Download App SIS Signature
2017-03-30PLCSchneider ElectricDavid Formby and Raheem Beyah of Georgia Tech and Fortiphyd Logic, Inc. reported the identified vulnerabilities.N/ACVE-2017-6030 CVE-2017-6026 CVE-2017-6028 N/AN/AN/A

Source

						
							
								
#
# Schneider Electric Modicon PLCs
#


### VULNERABLE VENDOR
Schneider Electric


### VULNERABLE PRODUCT
Modicon PLCs



### RESEARCHER
David Formby and Raheem Beyah of Georgia Tech and Fortiphyd Logic, Inc. reported the identified vulnerabilities.



### AFFECTED PRODUCTS

The following versions of the Modicon M221, M241, and M251 programmable logic controllers (PLCs) are affected by a predictable value range from previous values vulnerability:

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 following versions of the Modicon M241 and M251 PLCs are affected by a use of insufficiently random values vulnerability:

Modicon M241, firmware versions prior to Version 4.0.5.11, and
Modicon M251, firmware versions prior to Version 4.0.5.11.
The following versions of the Modicon M241 and M251 PLCs are affected by an insufficiently protected credentials vulnerability:

Modicon M241, all firmware versions, and
Modicon M251, all firmware versions.



### IMPACT

Successful exploitation of these vulnerabilities may allow a remote attacker to spoof or disrupt Transmission Control Protocol (TCP) connections, sniff sensitive account information, and gain unauthorized access to a current web session.



### VULNERABILITY OVERVIEW

PREDICTABLE VALUE RANGE FROM PREVIOUS VALUES CWE-343
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.
CVE-2017-6030 has been assigned to this vulnerability.
A CVSS v3 base score of 6.5 has been assigned; the CVSS vector string is (AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:L)


USE OF INSUFFICIENTLY RANDOM VALUES CWE-330
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.
CVE-2017-6026 has been assigned to this vulnerability.
A CVSS v3 base score of 6.5 has been assigned; the CVSS vector string is (AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N)


INSUFFICIENTLY PROTECTED CREDENTIALS CWE-522
Log-in credentials are sent over the network with Base64 encoding leaving them susceptible to sniffing.
Sniffed credentials could then be used to log into the web application.
CVE-2017-6028 has been assigned to this vulnerability.
A CVSS v3 base score of 7.5 has been assigned; the CVSS vector string is (AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N)





### BACKGROUND

Critical Infrastructure Sector(s): Critical Manufacturing, Food and Agriculture, Water and Wastewater Systems
Countries/Areas Deployed: Worldwide
Company Headquarters Location: Paris, France




### MITIGATION

Schneider Electric has released new firmware versions to address the predictable value range from previous values vulnerability and the use of insufficiently random values vulnerability, which are available through Schneider Electric's software update tool, SoMachine, Version 4.2, and SoMachineBasic, Version 1.5. Schneider Electric has not released a product to address the insufficiently protected credentials vulnerability.

however, Schneider Electric has provided compensating controls to reduce the risk of exploitation.

SoMachineBasic, Version 1.5, is available at the following location:

http://www.schneider-electric.fr/fr/download/document/SOMBASAP15SOFT/


Schneider Electric has provided the following compensating controls to reduce the risk of exploitation of the insufficiently protected credentials vulnerability:

Verify that the hardware and software infrastructure that the PLCs are integrated into (along with all organizational measures and rules covering access to the infrastructure) consider the results of the hazard and risk analysis, and are implemented according to best practices and standards such as ISA/IEC 62443.

Limit traffic on the local network with managed switches
Where possible, avoid using Wi-Fi networks, but when Wi-Fi is essential, use only secure communications (such as WPA2 encryption)
Do not grant [network] access to unknown computers
When remote access is essential, use secure methods such as Virtual Private Networks (VPNs), and ensure the remote access solution(s), as well as the remote computer(s) are kept up-to-date with the latest security patches.

Schneider Electric has released Security Notifications SEVD-2017-075-01, SEVD-2017-075-02, and SEVD-2017-075-03, which provide additional information about the identified vulnerabilities, mitigations, and compensating controls:

http://www.schneider-electric.com/en/download/document/SEVD-2017-075-01/


http://www.schneider-electric.com/en/download/document/SEVD-2017-075-02/


http://www.schneider-electric.com/en/download/document/SEVD-2017-075-03/