Siemens Fixes SIMATIC Vulnerabilities

Wednesday, February 5, 2014 @ 02:02 PM gHale


Siemens created an update that mitigates multiple vulnerabilities in the Siemens SIMATIC WinCC Open Architecture (OA) application, according to a report on ICS-CERT.

SIMATIC WinCC OA, all versions prior to 3.12 P002 suffer from the remotely exploitable vulnerabilities, discovered by researchers Gleb Gritsai, Ilya Karpov, and Kirill Nesterov of Positive Technologies.

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Successful exploitation of these vulnerabilities may result in attackers escalating their privileges, performing remote code execution, traversing through file systems, or causing a denial of service.

Siemens is a multinational company headquartered in Munich, Germany. The affected product, SIMATIC WinCC OA, is a client-server human-machine interface (HMI) system.

SIMATIC WinCC OA deploys across several sectors including food and beverage, water and wastewater, oil and gas, and chemical, according to Siemens. Siemens estimates these products primarily see use in the United States and Europe with a small percentage in Asia.

The SIMATIC WinCC OA integrated Web server at Port 4999/TCP might allow attackers to perform remote code execution by sending specially crafted packets without authentication.

CVE-2014-1697 is the case number assigned to this vulnerability, which has a CVSS v2 base score of 9.3.

The SIMATIC WinCC OA integrated Web server at Port 4999/TCP might allow attackers to traverse through the server’s file system based on the application’s Windows user permissions by sending specially crafted packets over the network without authentication.

CVE-2014-1698 is the case number assigned to this vulnerability, which has a CVSS v2 base score of 5.0.

The SIMATIC WinCC OA integrated Web server at Port 4999/TCP might allow attackers to perform a denial of service attack on the SIMATIC WinCC OA monitoring service by sending malformed HTTP requests over the network without authentication. Restarting the WinCC OA Console recovers the monitoring service.

CVE-2014-1699 is the case number assigned to this vulnerability, which has a CVSS v2 base score of 5.0.

The SIMATIC WinCC OA server application has a weak hashing algorithm for project users’ credentials. By brute force, attackers might be able to escalate their privileges within the affected WinCC OA server application.

CVE-2014-1696 is the case number assigned to this vulnerability, which has a CVSS v2 base score of 7.5.

No known public exploits specifically target these vulnerabilities. An attacker with a low to moderate skill would be able to exploit these vulnerabilities.

Siemens recommends updating to SIMATIC WinCC OA v3.12 and to install patch P002 January.

Click here to obtain SIMATIC WiNCC OA v3.12 (login and password required).

Click here for the SIMATIC WinCC OA v3.12 P002 January patch (login and password required).

Click here for additional information on the Siemens security advisory.



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