Denial of service in Siemens SIMATIC RFID Readers

1) Resource exhaustion

EUVDB-ID: #VU54016

Risk: Medium

CVSSv3.1: 6.5 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2021-31340

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 application does not properly control consumption of internal resources. A remote attacker can trigger resource exhaustion and perform a denial of service (DoS) attack.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

SIMATIC RF166C: 1.1

SIMATIC RF185C: 1.1

SIMATIC RF186C: 1.1

SIMATIC RF186CI: 1.1

SIMATIC RF188C: 1.1

SIMATIC RF188CI: 1.1

SIMATIC RF360R: All versions

SIMATIC RF615R: before 3.0

SIMATIC RF680R: before 3.0

SIMATIC RF685R: before 3.0

External links

http://cert-portal.siemens.com/productcert/pdf/ssa-787292.pdf
http://us-cert.cisa.gov/ics/advisories/icsa-21-159-13

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.