Denial of service in Siemens KTK, SIDOOR, SIMATIC, and SINAMICS

1) Resource exhaustion

EUVDB-ID: #VU26965

Risk: Medium

CVSSv3.1: 6.5 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2019-19300

CWE-ID: CWE-400 - Resource exhaustion

Exploit availability: No

Description

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

The vulnerability exists due to the Interniche-based TCP stack can be forced to make resource intense calls for every incoming packet. A remote attacker can trigger resource exhaustion and perform a denial of service (DoS) attack.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

KTK ATE530S: All versions

SIDOOR ATD430W: All versions

SIDOOR ATE530S COATED: All versions

SIDOOR ATE531S: All versions

SIMATIC ET200SP IM155-6 MF HF: All versions

SIMATIC ET 200SP Open Controller CPU 1515SP PC: before 2.1.7

SIMATIC ET 200SP Open Controller CPU 1515SP PC2: before 20.8

SIMATIC ET200MP IM155-5 PN HF: 4.2.0

SIMATIC ET200SP IM155-6 PN HA: All versions

SIMATIC ET200SP IM155-6 PN HF: 4.2

SIMATIC ET200SP IM155-6 PN/2 HF: 4.2

SIMATIC ET200SP IM155-6 PN/3 HF: 4.2

SIMATIC MICRO-DRIVE PDC: All versions

SIMATIC PN/PN Coupler: 4.2

SIMATIC S7-1500 CPU: before 2.8

SIMATIC S7-1500 Software Controller: before 20.8

SIMATIC S7-300: All versions

SIMATIC S7-400 PN/DP V7: All versions

SIMATIC S7-400 PN/DP V6: All versions

SIMATIC S7-410: All versions

SIMATIC TDC CP51M1: All versions

SIMATIC TDC CPU555: All versions

SIMATIC WinAC RTX (F) 2010: All versions

SINAMICS S/G Control Unit w. PROFINET: All versions

External links

http://cert-portal.siemens.com/productcert/pdf/ssa-593272.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.