#VU27963 Insecure DLL loading in EcoStruxure Operator Terminal Expert - CVE-2020-7494

Vulnerability identifier: #VU27963

Vulnerability risk: High

CVSSv4.0: 5.7 [CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Amber]

CVE-ID: CVE-2020-7494

CWE-ID: CWE-427

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
EcoStruxure Operator Terminal Expert
Client/Desktop applications / Other client software

Vendor: Schneider Electric

Description

The vulnerability allows a remote attacker to compromise vulnerable system.

The vulnerability exists within the handling of VXDZ files due to the application loads DLL libraries in an insecure manner. A remote attacker can place a specially crafted .dll file, trick the victim into opening a file, associated with the vulnerable application, and execute arbitrary code on victim's system.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

EcoStruxure Operator Terminal Expert: 3.1 SP1

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External links
https://www.zerodayinitiative.com/advisories/ZDI-20-656/
https://www.se.com/ww/en/download/document/SEVD-2020-133-04/

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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.