#VU27554 Insecure DLL loading in jSerialComm and EcoStruxure IT Gateway - CVE-2020-10626

Vulnerability identifier: #VU27554

Vulnerability risk: Low

CVSSv4.0: 4 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2020-10626

CWE-ID: CWE-427

Exploitation vector: Local

Exploit availability: No

Vulnerable software:
jSerialComm
Web applications / JS libraries
EcoStruxure IT Gateway
Server applications / IDS/IPS systems, Firewalls and proxy servers

Vendor: Fazecast
Schneider Electric

Description

The vulnerability allows a local user to compromise vulnerable system.

The vulnerability exists due to the application loads DLL libraries in an insecure manner. A local user can place a specially crafted .dll file into a temporary directory on the system and execute arbitrary code with SYSTEM privileges.

Note: This vulnerability affects the following EcoStruxure IT Gateway versions:

• Versions 1.5.x, 1.6.x, 1.7.x

Mitigation
Install updates from vendor's website.

Vulnerable software versions

jSerialComm: 2.0.2 - 2.2.2

EcoStruxure IT Gateway: before 1.8.1

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External links
https://ics-cert.us-cert.gov/advisories/ICSA2012601
https://www.zerodayinitiative.com/advisories/ZDI-20-588/

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Q & A

Can this vulnerability be exploited remotely?

No. This vulnerability can be exploited locally. The attacker should have authentication credentials and successfully authenticate on the system.

Is there known malware, which exploits this vulnerability?

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