Chemical Safety Incidents
Schneider Working on Modicon, SoMachine Holes
Friday, April 14, 2017 @ 03:04 PM gHale
Schneider Electric recommends users employ strategic mitigation methods to fend off a use of hard-coded cryptographic key and protection mechanism vulnerabilities in its Modicon M221 PLCs and SoMachine Basic products, according to a report with ICS-CERT.
Simon Heming, Maik Brüggemann, Hendrik Schwartke, and Ralf Spenneberg of Open Source Security discovered these remotely exploitable vulnerabilities. Public exploits are available.
The vulnerabilities affect the following PLCs and tools for configuring and developing automation machinery:
• Modicon M221 PLC, firmware versions up to v220.127.116.11
• SoMachine Basic, software versions up to v1.5
One vulnerability may allow an attacker to extract a protected project file from the controller to obtain sensitive project information. While the other vulnerability may allow a user with access to a protected project file to decrypt it in order to obtain sensitive information without authorization.
Schneider Electric recommends users store project files in secure, access-restricted locations and encrypt project files with reputable third party file encryption tools. A fix to enhance the SoMachine Basic encryption mechanism will release June 15.
Schneider Electric’s security notice SEVD-2017-097-01 is available.
The products see use in the Commercial Facilities sector. They also see action on a global basis.
Project files, including user-defined project passwords, end up encrypted with a hardcoded password.
CVE-2017-7574 is the case number assigned to this vulnerability, which has a CVSS v3 base score of 10.0.
In the other vulnerability, an attacker can send a specifically crafted command via Modbus over TCP port 502 to the logic controller to discover an application protection password.
CVE-2017-7575 is the case number assigned to this vulnerability, which has a CVSS v3 base score of 10.0.
Schneider Electric recommends users implement the following mitigations until an enhanced encryption mechanism releases June 15:
• Activate Application Protection with a blank password within Modicon M221 applications, as described in section “Password Protecting an Application” of SoMachine Basic online help. This will disable the application upload features of the M221.
• Protect access to controllers using a firewall and blocking all remote/external access to Port 502/TCP.
Schneider Electric’s security notice SEVD-2017-097-02 is available.