Denial of service in Siemens SIMATIC Controller Web Servers

1) Uncaught Exception

EUVDB-ID: #VU48917

Risk: Medium

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:Green]

CVE-ID: CVE-2020-15796

CWE-ID: CWE-248 - Uncaught Exception

Exploit availability: No

Description

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

The vulnerability exists due to uncaught exception. A remote attacker can send a specially crafted HTTP request to the products web server and cause a denial of service condition.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

SIMATIC ET 200SP Open Controller: 20.8

SIMATIC S7-1500 Software Controller: 20.8

CPE2.3

• cpe:2.3:a:siemens:simatic_et_200sp_open_controller:20.8:*:*:*:*:*:*:*
• cpe:2.3:a:siemens:simatic_s7-1500_software_controller:20.8:*:*:*:*:*:*:*

External links

https://ics-cert.us-cert.gov/advisories/icsa-20-343-09

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.