Siemens Fixing SIMATIC, SIMOTION, SINUMERIK

Thursday, March 1, 2018 @ 03:03 PM gHale

Siemens has mitigations and workarounds to remedy stack-based buffer overflow and a permissions, privileges, and access controls issues in its SIMATIC, SIMOTION, and SINUMERIK, according to a report with ICS-CERT.

Successful exploitation of these remotely exploitable vulnerabilities, that Siemens self-reported, could result in execution of arbitrary code, extended privileges, and unauthenticated access to sensitive data.

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Siemens Updates SIMATIC Industrial PCs

Siemens reports the vulnerabilities affect the following Industrial PCs and BIOS versions:
• SIMATIC Field-PG M3: ME prior to V6.2.61.3535
• SIMATIC Field-PG M4: BIOS prior to V18.01.06
• SIMATIC Field-PG M5: BIOS prior to V22.01.04
• SIMATIC HMI IPC677C: ME prior to V6.2.61.3535
• SIMATIC IPC427D: BIOS prior to V17.0?.10
• SIMATIC IPC427E: BIOS prior to V21.01.07
• SIMATIC IPC477D: BIOS prior to V17.0?.10
• SIMATIC IPC477D PRO: BIOS prior to V17.0?.10
• SIMATIC IPC477E: BIOS prior to V21.01.07
• SIMATIC IPC547D: ME prior to V7.1.91.3272
• SIMATIC IPC547E: ME prior to V9.1.41.3024
• SIMATIC IPC547G: ME prior to V11.8.50.3425 and BIOS < R1.21.0 • SIMATIC IPC627C: ME prior to V6.2.61.3535 • SIMATIC IPC627D: ME prior to V9.1.41.3024 • SIMATIC IPC647C: ME prior to V6.2.61.3535 • SIMATIC IPC647D: ME prior to V9.1.41.3024 • SIMATIC IPC677D: ME prior to V9.1.41.3024 • SIMATIC IPC827C: ME prior to V6.2.61.3535 • SIMATIC IPC827D: ME prior to V9.1.41.3024 • SIMATIC IPC847C: ME prior to V6.2.61.3535 • SIMATIC IPC847D: ME prior to V9.1.41.3024 • SIMATIC ITP1000: BIOS prior to V23.01.03 • SINUMERIK PCU50.5-C, WIN7: ME prior to V6.2.61.3535 • SINUMERIK PCU50.5-C, WINXP: ME prior to V6.2.61.3535 • SINUMERIK PCU50.5-P, WIN7: ME prior to V6.2.61.3535 • SINUMERIK PCU50.5-P, WINXP: ME prior to V6.2.61.3535 • SIMOTION P320-4S: BIOS < S17.02.06.83.1 No known public exploits specifically target these vulnerabilities. However, an attacker with low skill level could leverage the vulnerabilities. In one vulnerability, multiple buffer overflows could allow attackers to execute arbitrary code. Local access to the system is required to exploit this vulnerability. CVE-2017-5705, CVE-2017-5706, and CVE-2017-5707 are the case numbers assigned to these vulnerabilities, which have a CVSS v3 base score of 8.2. In addition, a buffer overflow could allow remote authenticated attackers to execute arbitrary code with extended privileges. CVE-2017-5712 is the case number assigned to this vulnerability, which has a CVSS v3 base score of 7.2. In addition, multiple buffer overflows could allow attackers with local access to execute arbitrary code. CVE-2017-5711 is the case number assigned to this vulnerability, which has a CVSS v3 base score of 6.7. Also, multiple privilege escalations could allow unauthenticated access to sensitive data. CVE-2017-5708, CVE-2017-5709, and CVE-2017-5710 are the case numbers assigned to these vulnerabilities, which have a CVSS v3 base score of 7.5. The product sees action mainly in the chemical, critical manufacturing, energy, food and agriculture and water and wastewater systems sectors. They also see use on a global basis. As a general security measure, Siemens recommends protecting network access to devices with appropriate mechanisms. In order to run the devices in a protected IT environment, Siemens recommends users configure the environment according to Siemens’ Operational Guidelines for Industrial Security, and follow the recommendations in the product manuals. Click here to view the Operational Guidelines for Industrial Security.

Click here for additional information on Industrial Security by Siemens.

Siemens has identified the following specific workarounds and mitigations users can apply to reduce the risk:
• The attacker must have network access for CVE-2017-5712 and local access for all other vulnerabilities. Siemens recommends operating the devices only within trusted networks.

For more information on these vulnerabilities and associated software updates, see Siemens security notification SSA-892715.



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