Information disclosure in Siemens SIMATIC S7-300 and S7-400 CPUs



Published: 2020-09-09
Risk Low
Patch available YES
Number of vulnerabilities 1
CVE-ID CVE-2020-15791
CWE-ID CWE-522
Exploitation vector Local network
Public exploit N/A
Vulnerable software
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SIMATIC S7-300
Hardware solutions / Firmware

SIMATIC S7-400
Hardware solutions / Firmware

Vendor Siemens

Security Bulletin

This security bulletin contains one low risk vulnerability.

1) Insufficiently protected credentials

EUVDB-ID: #VU46521

Risk: Low

CVSSv3.1: 4.6 [CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N/E:U/RL:O/RC:C]

CVE-ID: CVE-2020-15791

CWE-ID: CWE-522 - Insufficiently Protected Credentials

Exploit availability: No

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

External links

http://ics-cert.us-cert.gov/advisories/icsa-20-252-02


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.



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