Denial of service in Siemens SIMATIC S7-300

1) Input validation error

EUVDB-ID: #VU17655

Risk: Low

CVSSv4.0: 6.6 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2018-16561

CWE-ID: CWE-20 - Improper input validation

Exploit availability: No

Description

The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.

The vulnerability exists due to insufficient validation of user-supplied input. A remote attacker can send a specially crafted S7 communication packet to a communication interface of the CPU and cause a denial-of-service condition of the core functionality of the CPU.

Mitigation

Update to version 3.X.16.

Vulnerable software versions

SIMATIC S7-300: 2.0.0 - 3.3.0

CPE2.3

• cpe:2.3:h:siemens:simatic_s7-300:2.0.0:*:*:*:*:*:*:*
• cpe:2.3:h:siemens:simatic_s7-300:3.0.0:*:*:*:*:*:*:*
• cpe:2.3:h:siemens:simatic_s7-300:3.1.0:*:*:*:*:*:*:*

External links

https://cert-portal.siemens.com/productcert/pdf/ssa-306710.pdf

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.