#VU46521 Insufficiently protected credentials in SIMATIC S7-300 and SIMATIC S7-400 - CVE-2020-15791

Vulnerability identifier: #VU46521

Vulnerability risk: Low

CVSSv4.0: 2.3 [CVSS:4.0/AV:A/AC:L/AT:P/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2020-15791

CWE-ID: CWE-522

Exploitation vector: Local network

Exploit availability: No

Vulnerable software:
SIMATIC S7-300
Hardware solutions / Firmware
SIMATIC S7-400
Hardware solutions / Firmware

Vendor: Siemens

Description

The vulnerability allows a remote attacker to gain access to sensitive information on the system.

The vulnerability exists due to the authentication protocol between a client and a PLC via Port 102/TCP (ISO-TSAP) insufficiently protects the transmitted password. A remote attacker on the local network can obtain valid PLC credentials.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

SIMATIC S7-300: All versions

SIMATIC S7-400: All versions

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External links
https://ics-cert.us-cert.gov/advisories/icsa-20-252-02

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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 local network (LAN).

Is there known malware, which exploits this vulnerability?

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