Vulnerability identifier: #VU19158

Vulnerability risk: Medium

CVSSv3.1: 6.3 [CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2019-10935

CWE-ID: CWE-434

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
SIMATIC WinCC Professional
Server applications / SCADA systems
SIMATIC PCS 7
Server applications / SCADA systems
Siemens SIMATIC WinCC
Server applications / SCADA systems
SIMATIC WinCC Runtime Professional
Server applications / SCADA systems

Vendor: Siemens

Description

The vulnerability allows a remote attacker to compromise vulnerable system.

The vulnerability exists due to insufficient validation of file uploads. A remote authenticated user with network access to the WinCC DataMonitor application can upload arbitrary ASPX code on the server.

The vulnerability is relevant only in situations where an attacker has access via the web interface but not to the directory structure.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

SIMATIC WinCC Professional: 13.001 - 15

SIMATIC PCS 7: 8.0 - 9.0

Siemens SIMATIC WinCC: 5.0 - 7.5 Update 2

SIMATIC WinCC Runtime Professional: 13.0 - 15 Update 4

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External links
http://cert-portal.siemens.com/productcert/pdf/ssa-121293.pdf

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Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote authenticated privileged user via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.