Siemens Updates DCP DoS Hole

Friday, June 16, 2017 @ 04:06 PM gHale


Siemens released more firmware updates for devices using the PROFINET Discovery and Configuration Protocol (DCP) to mitigate a denial of service (DoS) vulnerability, according to a report with ICS-CERT.

Successful exploitation of these vulnerabilities, discovered by Duan JinTong, Ma ShaoShuai, and Cheng Lei from NSFOCUS Security Team who reported these vulnerabilities directly to Siemens, could cause the targeted device to enter a denial-of-service condition, which may require human interaction to recover the system.

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The vulnerability is exploitable from an adjacent network.
• SIMATIC CP 343-1 Std, CP 343-1 Lean: All versions
• SIMATIC CP 343-1 Adv: All versions
• SIMATIC CP 443-1 Std, CP 443-1 Adv: All versions prior to V3.2.17
• SIMATIC CP 443-1 OPC-UA: All versions
• SIMATIC CP 1243-1: All versions
• SIMATIC CM 1542-1: All versions prior to V2.0
• SIMATIC CP 1543SP-1, CP 1542SP-1 and CP 1542SP-1 IRC: All versions
• SIMATIC CP 1543-1: All versions prior to V2.1
• SIMATIC RF650R, RF680R, RF685R: All versions prior to V3.0
• SIMATIC CP 1616, CP 1604, DK-16xx PN IO: All versions prior to V2.7
• SCALANCE X200: All versions
• SCALANCE X200 IRT: All versions
• SCALANCE X300, X408: All versions prior to V4.1.0
• X414: All versions prior to V3.10.2
• SCALANCE XM400, XR500: All versions
• SCALANCE W700: All versions prior to V6.1
• SCALANCE M-800,S615: All versions
• Softnet PROFINET IO for PC-based Windows systems: All versions
• IE/PB-Link: All versions prior to V3.0
• IE/AS-i Link PN IO: All versions
• SIMATIC Teleservice Adapter Standard Modem, IE Basic, IE Advanced: All versions
• SITOP PSU8600 PROFINET: All versions prior to V1.2.0
• SITOP UPS1600 PROFINET: All versions prior to V2.2.0
• SIMATIC ET 200 Interface modules for PROFINET IO:
SIMATIC ET 200AL: All versions
SIMATIC ET 200ecoPN: All versions
SIMATIC ET 200M: All versions
SIMATIC ET 200MP: All versions prior to V4.0.1
SIMATIC ET 200pro: All versions
SIMATIC ET 200S: All versions
SIMATIC ET 200SP: All versions
• PN/PN Coupler: All versions
• Development/Evaluation Kits for PROFINET IO:
DK Standard Ethernet Controller: All versions prior to V4.1.1 Patch04
EK-ERTEC 200P PN IO: All versions prior to V4.4.0 Patch01
EK-ERTEC 200 PN IO: All versions prior to V4.2.1 Patch03
• SIMATIC S7-200 SMART: All versions
• SIMATIC S7-300 including F and T: All versions prior to V3.X.14
• SIMATIC S7-400 including F and H: All versions prior to V8.2
• SIMATIC S7-1200 including F: All versions prior to V4.2.1
• SIMATIC S7-1500 including F, T, and TF: All versions prior to V2.1
• SIMATIC S7-1500 Software Controller including F: All versions prior to V2.1
• SIMATIC WinAC RTX 2010 including F: All versions
• SIRIUS ACT 3SU1 interface module PROFINET: All versions
• SIRIUS Soft starter 3RW44 PN: All versions
• SIRIUS Motor starter M200D PROFINET: All versions
• SIMOCODE pro V PROFINET : All versions
• SINAMICS:
SINAMICS DCM: All versions
SINAMICS DCP: All versions
SINAMICS G110M / G120(C/P/D) w. PN: All versions prior to V4.7 SP6 HF3
SINAMICS G130 and G150: All versions prior to V4.8 HF4
SINAMICS S110 w. PN: All versions
SINAMICS S120: All versions prior to V4.8 HF4
SINAMICS S150: All versions prior to V4.8 HF4
SINAMICS V90 w. PN: All versions
• SIMOTION: All versions prior to V4.5 HF1
• SINUMERIK 828D:
V4.5 and prior: All versions
V4.7: All versions prior to V4.7 SP4 HF1
• SINUMERIK 840D sl:
V4.5 and prior: All versions prior to V4.5 SP6 HF8
V4.7: All versions prior to V4.7 SP4 HF1
• SIMATIC HMI Comfort Panels, HMI Multi Panels, HMI Mobile Panels: All versions

Specially crafted PROFINET DCP broadcast packets could cause a DoS condition of affected products on a local Ethernet segment (Layer 2). Human interaction is required to recover the systems. PROFIBUS interfaces are not affected.

CVE-2017-2680 is the case number assigned to this vulnerability, which has a CVSS v3 base score of 6.5.

Specially crafted PROFINET DCP packets sent on a local Ethernet segment (Layer 2) to an affected product could cause a DoS condition in that product. Human interaction is required to recover the system. PROFIBUS interfaces are not affected.

This vulnerability affects only SIMATIC HMI Multi Panels and HMI Mobile Panels, and S7-300/S7-400 devices.

CVE-2017-2681 is the case number assigned to this vulnerability, which has a CVSS v3 base score of 6.5.

The product sees use in the critical manufacturing, food and agriculture, chemical, energy, and water and wastewater system sectors. The products see use on a global basis.

No known public exploits specifically target these vulnerabilities. However, an attacker with low skill level would be able to leverage the vulnerability.

The attacker must have network access to the local Ethernet segment (Layer 2).

Siemens recommends verifying the affected products are protected as described in PROFINET Security Guidelines and Siemens Operational Guidelines in order to run the devices in a protected IT environment.
http://www.profibus.com/download/downloads/profinet-security-guideline/display/
https://www.siemens.com/cert/operational-guidelines-industrial-security

Siemens provides firmware updates fixing the vulnerabilities for the following affected products and recommends users update to the new fixed version:
• SIMATIC CP 443-1 Std: Update to V3.2.17
• SIMATIC CP 443-1 Adv: Update to V3.2.17
• SIMATIC CM1542-1: Update to V2.0
• SIMATIC CP 1543-1: Update to V2.1
• SIMATIC RF650R, RF680R, RF685R: Update to V3.0
• SIMATIC CP 1616, CP 1604, DK-16xx PN IO: Update to V2.7
• SCALANCE X-300/X408: Update to V4.1.0
https://support.industry.siemens.com/cs/ww/en/view/109748080
• SCALANCE X414: Update to V3.10.2
https://support.industry.siemens.com/cs/ww/en/view/109747276
• SCALANCE W700: Update to V6.1.0
• IE/PB-Link: Upgrade to V3.0
• SITOP PSU8600 PROFINET: Update to V1.2.0
• SITOP UPS1600 PROFINET: Update to V2.2.0
• Development/Evaluation Kits for PROFINET IO:
DK Standard Ethernet Controller: All versions prior to V4.1.1 Patch04
EK-ERTEC 200P PN IO: All versions prior to V4.4.0 Patch01
EK-ERTEC 200 PN IO: All versions prior to V4.2.1 Patch03
• Updates for Development/Evaluation Kits for PROFINET IO can be obtained via email at ComDeC 
• SIMATIC S7-300 including F and T: Update to V3.X.14
• SIMATIC S7-CPU 410: Update to V8.2
• SIMATIC S7-1200 including F: Update to V4.2
• SIMATIC S7-1500 including F, T and TF: Update to V2.1
• SIMATIC S7-1500 Software Controller including F: Update to V2.1
• SINAMICS:
SINAMICS G110M/G120(C/P/D) w. PN: Update to V4.7 SP6 HF3
SINAMICS G130 and G150: V4.8: Update to V4.8 HF4
SINAMICS S120: V4.8: Update to V4.8 HF4
SINAMICS S150: V4.8: Update to V4.8 HF4
• SIMOTION: Update to V4.5 HF1
• SINUMERIK 828D: V4.7: All versions prior to V4.7 SP4 HF1
SINUMERIK software can be obtained from the local Siemens account manager
• SINUMERIK 840D sl:V4.5 and prior: Update to V4.5 SP6 HF8
V4.7: Update to V4.7 SP4 HF1

SINUMERIK software can end up obtained from the local Siemens account manager

Siemens is preparing updates for the remaining affected products and recommends the following mitigations in the meantime:
• Apply cell protection concept
• Use VPN for protecting network communication between cells
• Apply Defense-in-Depth

As a general security measure Siemens and PNO recommend protecting industrial control systems networks with appropriate mechanisms. Siemens encourages users to verify the affected products are protected as described in PNO Security Guidelines and Siemens operational guidelines in order to run the devices in a protected IT environment.

For more information on these vulnerabilities and more detailed mitigation instructions, see Siemens Security Advisory SSA-293562.



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