Siemens and ICS-CERT published advisories this week to warn organizations of potentially serious vulnerabilities affecting some of the German technology conglomerate’s building controller and smart grid devices.
Users of the OZW672 and OZW772 products, designed for remote plant control and monitoring, have been informed of medium and high severity flaws allowing attackers to access or alter historical measurement data stored on the device, and read or manipulate data in TLS sessions via man-in-the-middle (MitM) attacks.
The security holes, discovered by Stefan Viehböck from SEC Consult, have not been patched, but Siemens has provided a series of recommendations for preventing potential attacks.
Siemens also informed customers of five vulnerabilities affecting Reyrolle protection relays. The flaws, discovered by the vendor itself, can be exploited by remote attackers or ones with network access to obtain sensitive information, bypass authentication and perform administrative operations, and cause a denial-of-service (DoS) condition.
The weaknesses have been patched with the release of firmware version 4.29.01. These and other vulnerabilities also affect SIPROTEC 4 and Compact protection products.
A separate advisory published by Siemens describes a DoS vulnerability affecting the SIMATIC Logon automation software, which provides authentication for access control on SIMATIC human-machine interface (HMI) panels. The security hole has been addressed with the release of version 1.6 of the software.
Schneider Electric patches flaws in Wonderware and Ampla MES products
In addition to the Siemens advisories, ICS-CERT informed industrial organizations this week of vulnerabilities affecting Schneider Electric Ampla Manufacturing Execution Systems (MES) and the Wonderware ArchestrA Logger logging software.
Wonderware ArchestrA Logger versions 2017.426.2307.1 and prior are affected by three high severity flaws that can be exploited for remote code execution and DoS attacks.
Ampla MES versions 6.4 and earlier fail to properly protect sensitive information – specifically, passwords are hashed using a weak algorithm, and session data is not encrypted when the software interacts with third-party databases.