Arbitrary file upload in Siemens SIMATIC WinCC Professional

1) Arbitrary file upload

EUVDB-ID: #VU19158

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 - Unrestricted Upload of File with Dangerous Type

Exploit availability: No

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

External links

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

Q & A

Can this vulnerability be exploited remotely?

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

How the attacker can exploit this vulnerability?

The attacker would have to send a specially crafted request to the affected application in order to exploit this vulnerability.

Is there known malware, which exploits this vulnerability?

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