ICS-CERT Publishes Advisory and Three Updates for Siemens Products

Today the DHS ICS-CERT published one new control system security advisory for products from Siemens. They also provided updates for three previously published Siemens control system security advisories.

Siemens Advisory

This advisory describes a file and directory information exposure vulnerability in the Siemens Simatic WinCC OA iOS App. The vulnerability was reported by Alexander Bolshev of IOActive and Ivan Yushkevich of Embedi. Siemens has identified workarounds to mitigate the vulnerability. There is no indication that either researcher was provided an opportunity to verify the efficacy of the fix.

ICS-CERT reports that an uncharacterized attacker with physical access to the mobile device could exploit the vulnerability to read sensitive data located in the app’s directory.

SIMATIC Update

This update provides additional information on an advisory that was originally published on March 18^th, 2018. The update provides links to the updates for all of the affected products.

SIPROTEC Update #1

This update provides additional information on an advisory that was originally published on March 8^th, 2018. The ICS-CERT update provided a link to the updated version of the EN100 Ethernet module DNP3 variant with additional mitigation measures. The Siemens update also provided corrected affected version information on the same product.

SIPROTEC Update #2

This update provides additional information on an advisory that was originally published on March 8^th, 2018. The ICS-CERT update provided a link to the updated version of the EN100 Ethernet module DNP3 variant with additional mitigation measures. The Siemens update also provided corrected affected version information on the same product.

ICS-CERT Publishes 2 Advisories and Siemens Update

Yesterday the DHS ICS-CERT published two control system security advisories for products from Beckhoff and Siemens. They also updated a previously published advisory for products from Siemens. The two Siemens products were mentioned in a previous blog post.

Beckhoff Advisory

This advisory describes an untrusted pointer dereference vulnerability in the Beckhoff TwinCAT PLC products. The vulnerability was reported by Steven Seeley of Source Incite. According to the Beckhoff security advisory, the company has updates available that mitigate the vulnerability. There is no indication that Seeley has been provided an opportunity to verify the efficacy of the fix.

ICS-CERT reports that a relatively low-skilled attacker with uncharacterized access could exploit the vulnerability to escalate privileges. ICS-CERT reports that Matlab modules need to be recompiled after updating.

Siemens Advisory

This advisory describes an improper access control vulnerability in the Siemens SIMATIC WinCC OA UI mobile app. The vulnerability was reported by Alexander Bolshev from IOActive, and Ivan Yushkevich from Embedi. Siemens has updates available that mitigate the vulnerability. There is no indication that the researchers have verified the efficacy of the fix.

ICS-CERT reports that an uncharacterized attacker on an adjacent network could exploit the vulnerability to read and write data from and to the app’s project cache folder. The Siemens security advisory notes that a social engineering attack is required to convince the App user to connect to an attacker-controlled WinCC OA server

Siemens Update

This update provides new information on an advisory that was originally published on January 25th, 2018 and updated on February 6^th. The update removes a product from the affected product list.

ICS-CERT Publishes 4 Advisories and One ABB Update

Today the DHS ICS-CERT published four new control system security advisories for products from Schneider Electric (2), GE and Nortek. Additionally, they provided an update for a previously published advisory for products from ABB.

StructureOn Advisory

This advisory describes an unrestricted upload of file with dangerous type vulnerability in the Schneider StruxureOn Gateway software management program. The vulnerability is being self-reported.

ICS-CERT reports that a relatively low-skilled attacker could remotely exploit the vulnerability to upload a malicious file to any directory on the device, which could lead to remote code execution. The Schneider security advisory reports that the file must be a .zip file with specifically modified metadata for this vulnerability to be exploited.

IGSS Mobile Advisory

This advisory describes two vulnerabilities in the Schneider IGSS Mobile application (iOS and Android). The vulnerabilities were reported by Alexander Bolshev (IOActive) and Ivan Yushkevich (Embedi). Schneider has produced updates for both versions. There is no indication that either researcher has been provided an opportunity to verify the efficacy of the fix.

The two reported vulnerabilities are:

• Improper certificate validation - CVE-2017-9968; and

• Plaintext storage of password - CVE-2017-9969

ICS-CERT reports that a relatively low-skilled attacker with local access (okay they, actually said: “Locally exploitable”; that may not mean ‘local access’) could exploit the vulnerability to execute a man-in-the-middle attack. In addition, passwords can be accessed by unauthorized users.

NOTE: Marc Ayala pointed out to me that anyone can download these apps from the appropriate (iOs/Android) app store. This means that it would be easy to exploit a compromised mobile password. All the attacker needs to do is to get access to the IGSS configuration file on an oh so secure smart phone to compromise the password.

GE Advisory

This advisory describes two vulnerabilities in the GE D60 Line Distance Relay. The vulnerabilities were reported by Kirill Nesterov of Kaspersky Labs. GE has released new firmware that mitigates the vulnerability. There is no indication that Nesterov was provided an opportunity to verify the efficacy of the fix.

The two reported vulnerabilities are:

• Stack-based buffer overflow - CVE-2018-5475; and

• Improper restriction of operations within bounds of memory buffer - CVE-2018-5473

ICS-CERT reports that relatively low-skilled attacker could remotely exploit the vulnerability to execute arbitrary code on the device.

Nortek Advisory

This advisory describes a command injection vulnerability in the Nortek Linear eMerge E3 Series access control interface. The vulnerability was reported by Evgeny Ermakov and Sergey Gordeychik. Nortek recommends upgrading the system using established procedures. There is no indication that either researcher was provided an opportunity to verify the efficacy of the fix.

ICS-CERT reports that a relatively low-skilled attacker could remotely exploit the vulnerability  to execute malicious code on the system with elevated privileges, allowing for full control of the server.

ABB Update

This update provides additional information on an advisory that was originally published on November 14^th, 2017. The update reports that the new update of Mesh OS mitigates the KRACK vulnerability in these devices.

NOTE: The updated ABB security advisory that forms the basis for this ICS-CERT update was published on January 11^th, 2018.