Vulnerability identifier: #VU65274

Vulnerability risk: Low

CVSSv3.1: 6.6 [CVSS:3.1/AV:A/AC:H/PR:H/UI:N/S:C/C:H/I:H/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2022-34821

CWE-ID: CWE-94

Exploitation vector: Local network

Exploit availability: No

Vulnerable software:
SIMATIC CP 1242-7 V2
Hardware solutions / Firmware
SIMATIC CP 1243-1
Hardware solutions / Firmware
SIMATIC CP 1243-7 LTE EU
Hardware solutions / Firmware
SIMATIC CP 1243-7 LTE US
Hardware solutions / Firmware
SIMATIC CP 1243-8 IRC
Hardware solutions / Firmware
SIMATIC CP 1542SP-1 IRC
Hardware solutions / Firmware
SIMATIC CP 1543SP-1
Hardware solutions / Firmware
SIPLUS ET 200SP CP 1542SP-1 IRC TX RAIL
Hardware solutions / Firmware
SIPLUS ET 200SP CP 1543SP-1 ISEC
Hardware solutions / Firmware
SIPLUS ET 200SP CP 1543SP-1 ISEC TX RAIL
Hardware solutions / Firmware
SIPLUS NET CP 1242-7 V2
Hardware solutions / Firmware
SIPLUS S7-1200 CP 1243-1
Hardware solutions / Firmware
SIPLUS S7-1200 CP 1243-1 RAIL
Hardware solutions / Firmware
SIMATIC CP 1543-1
Hardware solutions / Firmware
SIPLUS NET CP 1543-1
Hardware solutions / Firmware

Vendor: Siemens

Description

The vulnerability allows a remote user to execute arbitrary code on the target system.

The vulnerability exists due to improper input validation within the specific configuration options for OpenVPN. A remote administrator on the local network can send a specially crafted request and execute arbitrary code on the target system.

Successful exploitation of this vulnerability may result in complete compromise of vulnerable system.

Mitigation
Install update from vendor's website.

Vulnerable software versions

SIMATIC CP 1242-7 V2: All versions

SIMATIC CP 1243-1: All versions

SIMATIC CP 1243-7 LTE EU: All versions

SIMATIC CP 1243-7 LTE US: All versions

SIMATIC CP 1243-8 IRC: All versions

SIMATIC CP 1542SP-1 IRC: 2.0

SIMATIC CP 1543SP-1: 2.0

SIPLUS ET 200SP CP 1542SP-1 IRC TX RAIL: 2.0

SIPLUS ET 200SP CP 1543SP-1 ISEC: 2.0

SIPLUS ET 200SP CP 1543SP-1 ISEC TX RAIL: 2.0

SIPLUS NET CP 1242-7 V2: All versions

SIPLUS S7-1200 CP 1243-1: All versions

SIPLUS S7-1200 CP 1243-1 RAIL: All versions

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External links
http://cert-portal.siemens.com/productcert/pdf/ssa-517377.pdficsa-22-195-12

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Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote authenticated privileged user via the local network (LAN).

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.