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Category:   Application (Generic)  >   Siemens SIMATIC WinCC Vendors:   Siemens
Siemens SIMATIC WinCC OPC Discovery Service Bug Lets Remote Users Cause Denial of Service Attacks
SecurityTracker Alert ID:  1039510
SecurityTracker URL:  http://securitytracker.com/id/1039510
CVE Reference:   CVE-2017-12069   (Links to External Site)
Date:  Oct 5 2017
Impact:   Denial of service via network, Disclosure of system information, Host/resource access via network
Fix Available:  Yes  Vendor Confirmed:  Yes  
Version(s): Runtime Professional; 13, 14
Description:   A vulnerability was reported in Siemens SIMATIC WinCC. A remote user can cause resource denial of service attacks.

A remote user can supply an XML request containing specially crafted DTD references to TCP port 4840 to cause the target system to connect to arbitrary resources. This can be exploited to obtain potentially sensitive information or consume excessive resources on the target system.

The vulnerability resides in the OPC Foundation UA Local Discovery Services (LDS) component.

The original advisory is available at:

https://opcfoundation-onlineapplications.org/faq/SecurityBulletins/OPC_Foundation_Security_Bulletin_CVE-2017-12069.pdf

Sergey Temnikov (Kaspersky Lab ICS CERT) reported this vulnerability.

Impact:   A remote user can cause resource denial of service attacks.
Solution:   The vendor has issued a fix (WinCC Runtime Professional V14 SP1).

For WinCC 7.2, the vendor recommends turning the vulnerable service off.

The vendor advisory is available at:

https://www.siemens.com/cert/pool/cert/siemens_security_advisory_ssa-535640.pdf

Vendor URL:  www.siemens.com/cert/pool/cert/siemens_security_advisory_ssa-535640.pdf (Links to External Site)
Cause:   Access control error
Underlying OS:  Windows (Any)

Message History:   None.


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