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ICS-CERT reminds organizations to perform proper impact analysis and risk assessment prior to taking defensive measures. Several recommended practices are available for reading and download, including Improving Industrial Control Systems Cybersecurity with Defense-in-Depth Strategies. The Control Systems Security Program (CSSP) also provides a section for control systems security recommended practices on the CSSP Web page. When remote access is required, use secure methods, such as Virtual Private Networks (VPNs), recognizing that VPN is only as secure as the connected devices.
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Locate control system networks and remote devices behind firewalls, and isolate them from the business network.Critical devices should not directly face the Internet. Minimize network exposure for all control system devices.
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ICS-CERT encourages asset owners to take additional defensive measures to protect against this and other cybersecurity risks. For further information please review the Siemens Security Advisory (SSA-110665) that can be found at the Siemens ProductCERT website. The updates implement a mechanism that rejects DLLs in the STEP 7 project folders, which contain executable code, thus preventing unintended execution of unchecked code. SIMATIC PCS 7 users should also apply this update. Siemens has provided the STEP 7 software update V5.5 SP1 (equivalent to V5.5.1) that resolves the vulnerability, but recommends that the latest Service Pack, V5.5 SP2,Service Pack 2 for STEP 7 V5.5 and STEP 7 Professional 2010,, Web site last accessed July 23, 2012. DifficultyĪn attacker with a medium skill level would be able to exploit these vulnerabilities. Malware and public exploits are known to target this vulnerability. This vulnerability can be remotely exploited. A CVSS v2 base score of 6.9 has been assigned the CVSS vector string is (AV:L/AC:M/Au:N/C:C/I:C/A:C). The code will be executed with the permissions of the STEP 7 application.ĬVE-2012-3015 has been assigned to this vulnerability. An attacker can place arbitrary library files into STEP 7 project folders that will be loaded on STEP 7 startup without validation. SIMATIC STEP 7 supports the loading of DLL files in STEP 7 project folders, which can be used within an attack against systems where STEP 7 is installed. Vulnerability Characterization Vulnerability OverviewĭLL Loading Mechanism Vulnerabilit圜WE-114: Process Control,, Web site last accessed July 23, 2012. Siemens SIMATIC S7 PLCs are used in a variety of industrial applications worldwide, including energy, water and wastewater, oil and gas, chemical, building automation, and manufacturing. Siemens SIMATIC STEP 7 and PCS 7 software is used to configure and manage Siemens SIMATIC S7 PLCs. ICS-CERT recommends that organizations evaluate the impact of this vulnerability based on their operational environment, architecture, and product implementation. Impact to individual organizations depends on many factors that are unique to each organization.