CVE-2017-6030: Schneider Electric Modicon PLCs Predictable Value Range from Previous Values

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/