Denial of service in Siemens SIMATIC S7-1500 and SIMATIC ET 200SP Open Controller

1) Improper input validation

EUVDB-ID: #VU15304

Risk: Low

CVSSv4.0: 2.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2018-13805

CWE-ID: CWE-20 - Improper input validation

Exploit availability: No

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 a large number of specially crafted packets to the PLC and cause the PLC to lose its ability to communicate over the network.

Mitigation

Update to version 2.5.

Vulnerable software versions

SIMATIC ET 200SP Open Controller: All versions

SIMATIC S7-1500 CPU: before 2.5

SIMATIC S7-1500 Software Controller: before 2.5

CPE2.3

• cpe:2.3:a:siemens:simatic_et_200sp_open_controller:*:*:*:*:*:*:*:*
• cpe:2.3:h:siemens:simatic_s7-1500_cpu:*:*:*:*:*:*:*:*
• cpe:2.3:a:siemens:simatic_s7-1500_software_controller:*:*:*:*:*:*:*:*

External links

https://cert-portal.siemens.com/productcert/pdf/ssa-347726.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.