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Denial of service in Siemens SIMATIC S7



Published: 2020-02-12
Severity Medium
Patch available YES
Number of vulnerabilities 1
CVE ID CVE-2019-13940
CWE ID CWE-400
Exploitation vector Network
Public exploit N/A
Vulnerable software
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SIMATIC S7-1200
Hardware solutions / Firmware

SIMATIC S7-300 PN/DP
Hardware solutions / Firmware

SIMATIC S7-400 PN/DP V6
Server applications / SCADA systems

SIMATIC S7-400 PN/DP V7
Server applications / SCADA systems

Vendor Siemens

Security Advisory

This security advisory describes one medium risk vulnerability.

1) Resource exhaustion

Severity: Medium

CVSSv3: 4.6 [CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L/E:U/RL:O/RC:C] [PCI]

CVE-ID: CVE-2019-13940

CWE-ID: CWE-400 - Uncontrolled Resource Consumption ('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 uncontrolled resource consumption. A remote attacker can send a specially crafted HTTP request to Ports 80/TCP and 443/TCP, trigger resource exhaustion and perform a denial of service (DoS) attack on the web server.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

SIMATIC S7-1200: 2.00, 2.2, 3.0, 3.1, 4.0

SIMATIC S7-400 PN/DP V6: -

SIMATIC S7-400 PN/DP V7: -

SIMATIC S7-300 PN/DP: -

CPE External links

https://cert-portal.siemens.com/productcert/pdf/ssa-431678.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.