Denial of service in Siemens SIMATIC S7-1500

1) Resource exhaustion

EUVDB-ID: #VU25266

Risk: Medium

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:Green]

CVE-ID: CVE-2019-19281

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 uncontrolled resource consumption. A remote attacker can send a specially crafted UDP packets, trigger resource exhaustion and perform a denial of service (DoS) attack.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

SIMATIC ET 200SP Open Controller CPU 1515SP PC2: All versions

SIMATIC S7-1500 CPU: 2.5

SIMATIC S7-1500 Software Controller: 2.5

CPE2.3

• cpe:2.3:a:siemens:simatic_et_200sp_open_controller_cpu_1515sp_pc2:*:*:*:*:*:*:*:*
• cpe:2.3:h:siemens:simatic_s7-1500_cpu:*:*:*:*:*:*:*:*
• cpe:2.3:h:siemens:simatic_s7-1500_cpu:2.5:*:*:*:*:*:*:*
• cpe:2.3:a:siemens:simatic_s7-1500_software_controller:*:*:*:*:*:*:*:*
• cpe:2.3:a:siemens:simatic_s7-1500_software_controller:2.5:*:*:*:*:*:*:*

External links

https://ics-cert.us-cert.gov/advisories/icsa-20-042-11
https://cert-portal.siemens.com/productcert/pdf/ssa-750824.pdf

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

How the attacker can exploit this vulnerability?

The attacker would have to send a specially crafted request to the affected application in order to exploit this vulnerability.

Is there known malware, which exploits this vulnerability?

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