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.
SIMATIC STEP 7 SOFTWARE 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, 2īe installed as soon as possible. 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).
SIMATIC STEP 7 SOFTWARE CODE
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 Overview 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. SIMATIC PCS 7 versions before and including V7.1 SP3.Īn attacker can execute arbitrary code by exploiting this vulnerability.SIMATIC STEP 7 versions prior to V5.5 Service Pack 1 (V5.5.1 equivalent), and.The following Siemens products and versions are affected. This vulnerability was fixed in 2011 by Siemens through a security update. Note: This advisory, together with advisory “ ICSA-12-205-01-Siemens WinCC Insecure SQL Authentication,” addresses vulnerabilities first discovered in 2010 in conjunction with the discovery of Stuxnet.
SIMATIC STEP 7 SOFTWARE PATCH
Siemens has produced a patch that resolves this vulnerability. This vulnerability can be remotely exploited, as was the case with Stuxnet malware which was known to target this vulnerability. Previous versions of SIMATIC STEP 7 and PCS 7 allowed the loading of malicious DLL files into the STEP 7 project folder that can be used to attack the system on which STEP 7 is installed. Siemens has released a software update for a DLL hijacking vulnerability in SIMATIC STEP 7 and SIMATIC PCS 7 software.
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