#VU15892 Improper input validation in Siemens products - CVE-2018-16557

Vulnerability identifier: #VU15892

Vulnerability 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-2018-16557

CWE-ID: CWE-20

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
SIMATIC S7-410
Hardware solutions / Firmware
SIMATIC S7-400
Hardware solutions / Firmware
SIMATIC S7-400 PN/DP V7
Server applications / SCADA systems
SIMATIC S7-400 H
Server applications / SCADA systems

Vendor: Siemens

Description

The vulnerability allows a remote attacker to cause DoS condition on the target system.

The vulnerability exists due to an error when processing malicious input. A remote attacker can send specially crafted packets to Port 102/TCP via Ethernet interface via PROFIBUS or MPI and cause the affected devices to crash.

Mitigation
Install update from vendor's website.

Vulnerable software versions

SIMATIC S7-410: All versions

SIMATIC S7-400 PN/DP V7: All versions

SIMATIC S7-400 H: All versions

SIMATIC S7-400: All versions

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External links
https://ics-cert.us-cert.gov/advisories/ICSA-18-317-02

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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 Internet.

Is there known malware, which exploits this vulnerability?

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