ICS-CERT: Siemens Scalance X Industrial Ethernet Vulnerability

Wednesday, April 18, 2012

Infosec Island Admin

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ICS-CERT has received a report from Siemens regarding a buffer overflow vulnerability in the web interface of the Scalance X Industrial Ethernet switch. This vulnerability was reported to Siemens by Jürgen Bilberger from Daimler TSS GmbH.

This vulnerability leaves the affected devices susceptible to a remote denial of service attack. Siemens has published a firmware update that addresses this vulnerability.

AFFECTED PRODUCTS

The following Scalance X products affected by this vulnerability:

• Scalance X414-3E
• Scalance X308-2M
• Scalance X-300EEC
• Scalance XR-300
• Scalance X-300

IMPACT

Successful exploitation of the reported vulnerability allows an attacker to perform malicious actions which may lead to a denial of service condition or possible arbitrary code execution. These actions may ultimately impact the process environment in which the system is deployed.

Impact to individual organizations depends on many factors that are unique to each organization. ICS-CERT recommends that organizations evaluate the impact of this vulnerability based on their operational environment, architecture, and product implementation.

BACKGROUND

Scalance X Industrial Ethernet switches are industrial grade Ethernet switches used to connect industrial components. This product line provides a web interface to manage controller configuration.

Scalance X is used in the Agriculture and Food, Critical Manufacturing, Government Facilities, Dams, Transportation Systems, Water, Chemical, Defense Industrial Base, Energy, and Communications sectors.

VULNERABILITY OVERVIEW

BUFFER OVERFLOW:  The embedded web server does not properly sanitize URLs in HTTP requests. If an attacker requests a malformed URL from the web server, a vulnerable Scalance X switch reboots, inhibits further data transmission to the switch, and may allow arbitrary code execution. CVE-2012-1802 has been assigned to this vulnerability. Siemens has assigned a CVSS V2 base score of 7.8.

EXPLOITABILITY: This vulnerability is remotely exploitable.

EXISTENCE OF EXPLOIT: No known exploits specifically target this vulnerability.

DIFFICULTY: An attacker with a moderate skill level would be able to exploit these vulnerabilities.

MITIGATION

Siemens has produced firmware updates that resolve this vulnerability for the listed hardware platforms. Siemens strongly recommends installing the updates as soon as possible. Download the appropriate update from the following links:

Firmware Update Location (Scalance X414-3E):

Firmware Update Location (Scalance X308-2M, X-300EEC, XR-300, X-300):

An overview over the Operational Guidelines for Industrial Security (with the cell protection concept):

• Information about industrial security by Siemens:

• Recommended security practices by US-CERT:

• For further inquiries on vulnerabilities in Siemens products and solutions, please contact the Siemens Product CERT:

The Siemens Security Advisory is available at:

The full ISC-CERT advisory can be found here:

Source:  http://www.us-cert.gov/control_systems/pdf/ICSA-12-102-04.pdf

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