Denial of service in Siemens SIMATIC S7

1) Resource exhaustion

EUVDB-ID: #VU25258

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-2019-13940

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 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 - 4.0

SIMATIC S7-400 PN/DP V6: All versions

SIMATIC S7-400 PN/DP V7: All versions

SIMATIC S7-300 PN/DP: All versions

CPE2.3

• cpe:2.3:h:siemens:simatic_s7-1200:2.00:*:*:*:*:*:*:*
• cpe:2.3:h:siemens:simatic_s7-1200:2.2:*:*:*:*:*:*:*
• cpe:2.3:h:siemens:simatic_s7-1200:3.0:*:*:*:*:*:*:*
• cpe:2.3:a:siemens:simatic_s7-400_pn_dp_v6:*:*:*:*:*:*:*:*
• cpe:2.3:a:siemens:simatic_s7-400_pn_dp_v7:*:*:*:*:*:*:*:*
• cpe:2.3:h:siemens:simatic_s7-300_pn_dp:*:*:*:*:*:*:*:*

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.