#VU78231 Resource exhaustion in Siemens products - CVE-2023-35920

Vulnerability identifier: #VU78231

Vulnerability 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-2023-35920

CWE-ID: CWE-400

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
SIMATIC MV540 H
Hardware solutions / Firmware
SIMATIC MV540 S
Hardware solutions / Firmware
SIMATIC MV550 H
Hardware solutions / Firmware
SIMATIC MV550 S
Hardware solutions / Firmware
SIMATIC MV560 U
Hardware solutions / Firmware
SIMATIC MV560 X
Hardware solutions / Firmware

Vendor: Siemens

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 when processing specially crafted IP packets. 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 MV540 H: before 3.3.4

SIMATIC MV540 S: before 3.3.4

SIMATIC MV550 H: before 3.3.4

SIMATIC MV550 S: before 3.3.4

SIMATIC MV560 U: before 3.3.4

SIMATIC MV560 X: before 3.3.4

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External links
https://cert-portal.siemens.com/productcert/txt/ssa-561322.txt

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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.