SCADA Vulnerabilities & Exposures (SVE)

CRITIFENCE® SCADA Vulnerabilities and Exposures Database (SVE)

[SVE-589175412] Siemens SCALANCE W1750D, M800, and S615 (Update A)

Date Type Platform Author EDB-ID CVE-ID OSVDB-ID Download App SIS Signature
2017-11-28OtherSiemensSiemens Product CERT reported the vulnerabilities to NCCIC.N/ACVE-2017-1370 CVE-2017-1449 CVE-2017-1449 CVE-2017-1449 N/AN/AN/A

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# Siemens SCALANCE W1750D, M800, and S615 (Update A)
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### VULNERABLE VENDOR
Siemens


### VULNERABLE PRODUCT
SCALANCE W1750D, M800, and S615 


### RESEARCHER
Siemens Product CERT reported the vulnerabilities to NCCIC.


### AFFECTED PRODUCTS
The following versions of SCALANCE, network interfaces, are affected:

SCALANCE W1750D: All versions, and
SCALANCE M800/S615: All versions


### IMPACT



### VULNERABILITY OVERVIEW
4.2.1 UNCONTROLLED RESOURCE CONSUMPTION ('RESOURCE EXHAUSTION') CWE-400
An attacker can cause a crash of the DNSmasq process by sending specially-crafted request messages to the service.
The following CVEs have been assigned to this group of vulnerabilities:
CVE-2017-13704
CVE-2017-14495
CVE-2017-14496
A CVSS v3 base score of 5.3 has been assigned; the CVSS vector string is (AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L)


4.2.2 IMPROPER RESTRICTION OF OPERATIONS WITHIN THE BOUNDS OF A MEMORY BUFFER CWE-119
An attacker can cause a crash or potentially execute arbitrary code by sending specially-crafted DNS responses to the DNSmasq process.
In order to exploit this vulnerability, an attacker must be able to trigger DNS requests from the device, and must be in a position that allows the injection of malicious DNS responses.
CVE-2017-14491 has been assigned to this vulnerability.
A CVSS v3 base score of 8.1 has been assigned; the CVSS vector string is (AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H)


4.3 


### BACKGROUND
Critical Infrastructure Sectors: Chemical, Energy, Food and Agriculture, Healthcare and Public Health, Transportation Systems, and Water and Wastewater Systems
Countries/Areas Deployed: Worldwide
Company Headquarters Location: Germany
4.4 RESEARCHER
Siemens Product CERT reported the vulnerabilities to NCCIC.
5. MITIGATIONS
Siemens reports they are preparing updates for the affected products and recommends the following mitigations until patches are available:
--------- Begin Update A Part 1 of 1 --------
For SCALANCE W1750D: Siemens recommends that users install V6.5.1.5-4.3.1.8 of the software. Users who do not use the “OpenDNS,” “Captive Portal,” or “URL redirection” functionalities can deploy firewall rules in the device configuration to block incoming access to Port 53/UDP.
--------- End Update A Part 1 of 1 --------
For SCALANCE M800/S615: Disable DNS proxy in the device configuration (System - DNS - DNS Proxy - Disable Checkbox for Enable DNS Proxy) and configure the connected devices in the internal network to use a different DNS server.
Apply Defense-in-Depth
Siemens has produced an advisory that can be found at:
https://www.siemens.com/cert/pool/cert/siemens_security_advisory_ssa-689071.pdf
(link is external)
Siemens also reports that SCALANCE W1750D devices that are operated in controller mode on an Aruba Mobility Controller are not affected if AOS versions newer than V6.3.1.25, V6.4.4.16 V6.5.1.9, V6.5.3.3, V6.5.4.2, or 8.1.0.4 are used.
NCCIC/ICS-CERT recommends that users take defensive measures to minimize the risk of exploitation of these vulnerabilities. Specifically, users should:
Minimize network exposure for all control system devices and/or systems, and ensure that they are not accessible from the Internet.
Locate control system networks and remote devices behind firewalls, and isolate them from the business network.
When remote access is required, use secure methods, such as Virtual Private Networks (VPNs), recognizing that VPNs may have vulnerabilities and should be updated to the most current version available. Also recognize that VPN is only as secure as the connected devices.
ICS-CERT reminds organizations to perform proper impact analysis and risk assessment prior to deploying defensive measures.
ICS-CERT also provides a section for control systems security recommended practices on the ICS-CERT web page. Several recommended practices are available for reading and download, including Improving Industrial Control Systems Cybersecurity with Defense-in-Depth Strategies.
Additional mitigation guidance and recommended practices are publicly available in the ICS‑CERT Technical Information Paper, ICS-TIP-12-146-01B--Targeted Cyber Intrusion Detection and Mitigation Strategies, that is available for download from the ICS-CERT web site.
Organizations observing any suspected malicious activity should follow their established internal procedures and report their findings to ICS-CERT for tracking and correlation against other incidents.




### MITIGATION
Siemens reports they are preparing updates for the affected products and recommends the following mitigations until patches are available:

--------- Begin Update A Part 1 of 1 --------
For SCALANCE W1750D: Siemens recommends that users install V6.5.1.5-4.3.1.8 of the software. Users who do not use the “OpenDNS,” “Captive Portal,” or “URL redirection” functionalities can deploy firewall rules in the device configuration to block incoming access to Port 53/UDP.

--------- End Update A Part 1 of 1 --------
For SCALANCE M800/S615: Disable DNS proxy in the device configuration (System - DNS - DNS Proxy - Disable Checkbox for Enable DNS Proxy) and configure the connected devices in the internal network to use a different DNS server.

Apply Defense-in-Depth
Siemens has produced an advisory that can be found at:

https://www.siemens.com/cert/pool/cert/siemens_security_advisory_ssa-689071.pdf


Siemens also reports that SCALANCE W1750D devices that are operated in controller mode on an Aruba Mobility Controller are not affected if AOS versions newer than V6.3.1.25, V6.4.4.16 V6.5.1.9, V6.5.3.3, V6.5.4.2, or 8.1.0.4 are used.