Vulnerability identifier: #VU36998

Vulnerability risk: Medium

CVSSv3.1: 5.2 [CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N/E:U/RL:O/RC:C]

CVE-ID: CVE-2017-16718

CWE-ID: CWE-327

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
TwinCAT
Client/Desktop applications / Software for system administration

Vendor: Beckhoff

Description

The vulnerability allows a remote non-authenticated attacker to gain access to sensitive information.

Beckhoff TwinCAT 3 supports communication over ADS. ADS is a protocol for industrial automation in protected environments. This protocol uses user configured routes, that can be edited remotely via ADS. This special command supports encrypted authentication with username/password. The encryption uses a fixed key, that could be extracted by an attacker. Precondition of the exploitation of this weakness is network access at the moment a route is added.

Mitigation
Install update from vendor's website.

Vulnerable software versions

TwinCAT: 3.0

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External links
http://download.beckhoff.com/download/Document/product-security/Advisories/advisory-2017-002.pdf

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Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

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