Multiple Siemens Products CVE-2019-10936 Denial of Service Vulnerability

Description

Multiple Siemens products are prone to a denial-of-service vulnerability. Attackers can exploit this issue to crash the affected device, denying service to legitimate users.

Technologies Affected

• Siemens SIMATIC CFU PA
• Siemens SIMATIC ET 200AL
• Siemens SIMATIC ET 200M
• Siemens SIMATIC ET 200MP IM 155-5 PN BA
• Siemens SIMATIC ET 200MP IM 155-5 PN HF
• Siemens SIMATIC ET 200MP IM 155-5 PN ST
• Siemens SIMATIC ET 200S
• Siemens SIMATIC ET 200SP IM 155-6 PN BA
• Siemens SIMATIC ET 200SP IM 155-6 PN HA
• Siemens SIMATIC ET 200SP IM 155-6 PN HF
• Siemens SIMATIC ET 200SP IM 155-6 PN HS
• Siemens SIMATIC ET 200SP IM 155-6 PN ST
• Siemens SIMATIC ET 200SP IM 155-6 PN/2 HF
• Siemens SIMATIC ET 200SP IM 155-6 PN/3 HF
• Siemens SIMATIC ET 200pro
• Siemens SIMATIC PN/PN Coupler
• Siemens SIMATIC PROFINET Driver
• Siemens SIMATIC S7-1200 CPU Family
• Siemens SIMATIC S7-1500 CPU family 2.0
• Siemens SIMATIC S7-1500 CPU family
• Siemens SIMATIC S7-300 CPU family
• Siemens SIMATIC S7-400 PN/DP 7
• Siemens SIMATIC S7-400 V6
• Siemens SIMATIC S7-400H V6
• Siemens SIMATIC S7-410 8
• Siemens SINAMICS DCM
• Siemens SINAMICS DCP
• Siemens SINAMICS G110M v4.7 (PN Control Unit)
• Siemens SINAMICS G120 v4.7 (PN Control Unit)
• Siemens SINAMICS GH150 4.7
• Siemens SINAMICS GL150 4.7
• Siemens SINAMICS GM150 4.7
• Siemens SINAMICS SL150 4.7.0
• Siemens SINAMICS SM120 4.7
• Siemens SINUMERIK 828D
• Siemens SINUMERIK 840D sl
• Siemens Sinamics G130 4.7
• Siemens Sinamics S110 -
• Siemens Sinamics S120 4.7
• Siemens Sinamics S150 -

Recommendations

Block external access at the network boundary, unless external parties require service.
If global access isn’t needed, filter access to the affected device at the network boundary. Restricting access to only trusted computers and networks might greatly reduce the likelihood of exploits.

Deploy network intrusion detection systems to monitor network traffic for malicious activity.
Deploy NIDS to monitor network traffic for signs of anomalous or suspicious activity. This includes but is not limited to unexplained incoming and outgoing traffic. This may indicate exploit attempts or activity that results from successful exploits.

Updates are available. Please see the references or vendor advisory for more information.