Vulnerability identifier: #VU12174

Vulnerability risk: High

CVSSv3.1: 8.5 [CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H/E:U/RL:W/RC:C]

CVE-ID: CVE-2018-8835

CWE-ID: CWE-415

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
WebAccess HMI Designer
Server applications / SCADA systems

Vendor: Advantech Co., Ltd

Description
The vulnerability allows a remote attacker to execute arbitrary code on the target system.

The weakness exists due to double free memory error when handling malicious input. A remote attacker can trick the victim into processing specially crafted .pm3 files, trigger memory corruption and execute arbitrary code with elevated privileges.

Successful exploitation of the vulnerability may result in system compromise.

Mitigation

NCCIC recommends that users take defensive measures to minimize the risk of exploitation of these vulnerabilities. Specifically, users should:

• Minimize network exposure for all control system devices and/or systems, and ensure that they are not accessible from the Internet.
• Locate control system networks and remote devices behind firewalls, and isolate them from the business network.
• When remote access is required, use secure methods, such as Virtual Private Networks (VPNs), recognizing that VPNs may have vulnerabilities and should be updated to the most current version available. Also recognize that VPN is only as secure as the connected devices.

Vulnerable software versions

WebAccess HMI Designer: 2.1 - 2.1.7.32

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External links
http://ics-cert.us-cert.gov/advisories/ICSA-18-114-03

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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.