Tuesday, December 5, 2017

ICS-CERT Publishes 1 Advisory and 1 Update

Today the DHS ICS-CERT published a control system security advisory for a product from Siemens. It also updated a previously issued advisory for products from Siemens.

Siemens Advisory

This advisory describes an improper input validation vulnerability in the Siemens Industrial Products. The vulnerability was reported by George Lashenko of CyberX. Siemens has produced a firmware update that mitigates the vulnerability. There is no indication that Lashenko was provided an opportunity to verify the efficacy of the fix.

ICS-CERT reports that a relatively low-skilled attacker could remotely exploit the vulnerability to conduct a denial-of-service (DoS) attack. The Siemens security advisory notes that the attacker requires network access to the affected devices.

Siemens Update

This update provides additional information for an advisory that was originally published on November 14th, 2017. The new information is updated affected version and mitigation information for:

• SCALANCE W-700 (IEEE 802.11n): All versions prior to V6.2.1

The associated Siemens updated security advisory also provides additional mitigating factors for:

• SCALANCE W-700 devices operated in Access Point;
• RUGGEDCOM RX1400 and RS9xxW;


The first vendor has now published a fix for the Key Reinstallation Attack – (KRACK) set of vulnerabilities that make control systems utilizing wireless systems using WPA2 security vulnerable to man-in-the-middle attacks; this is good news. Unfortunately, ICS-CERT still has not issued an alert outlining the extent of the vulnerability to the control system community. Nor have they even provided links to either the KRACK web site or the original paper describing the vulnerabilities. So much for ICS-CERT being interested in keeping the ICS community up to date on wide ranging vulnerabilities.

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