CVE-2021-31894

Severity Score

8.8

*CVSS v3.1

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

*Multiple Sources

Exploited in Wild

*KEV

Decision

*SSVC

Descriptions

A vulnerability has been identified in SIMATIC PCS 7 V8.2 and earlier (All versions), SIMATIC PCS 7 V9.X (All versions < V9.1 SP2), SIMATIC PDM (All versions < V9.2 SP2), SIMATIC STEP 7 V5.X (All versions < V5.7), SINAMICS STARTER (containing STEP 7 OEM version) (All versions < V5.4 SP2 HF1). A directory containing metafiles relevant to devices' configurations has write permissions. An attacker could leverage this vulnerability by changing the content of certain metafiles and subsequently manipulate parameters or behavior of devices that would be later configured by the affected software.

Se ha identificado una vulnerabilidad en SIMATIC PCS 7 V8.2 y anteriores (Todas las versiones), SIMATIC PCS 7 V9.X (Todas las versiones anteriores a V9.1 SP2), SIMATIC PDM (Todas las versiones anteriores a V9.2 SP2), SIMATIC STEP 7 V5.X (Todas las versiones anteriores a V5.7), SINAMICS STARTER (que contiene la versión OEM de STEP 7) (Todas las versiones anteriores a V5.4 SP2 HF1). Un directorio que contiene metafichas relevantes para las configuraciones de los dispositivos tiene permisos de escritura. Un atacante podría aprovechar esta vulnerabilidad cambiando el contenido de ciertos metaficheros y posteriormente manipular los parámetros o el comportamiento de los dispositivos que posteriormente serían configurados por el software afectado

*Credits: N/A

Attack Vector

Local

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Changed

Confidentiality

High

Integrity

High

Availability

High

Attack Vector

Local

Attack Complexity

Low

Authentication

None

Confidentiality

Complete

Integrity

Complete

Availability

Complete

* Common Vulnerability Scoring System

SSVC

Decision:-

Exploitation

Automatable

Tech. Impact

* Organization's Worst-case Scenario

Timeline

2021-04-29 CVE Reserved
2021-07-13 CVE Published
2023-03-08 EPSS Updated
2024-08-03 CVE Updated
---------- Exploited in Wild
---------- KEV Due Date
---------- First Exploit

CWE

CWE-732: Incorrect Permission Assignment for Critical Resource

CAPEC

References (1)

URL	Tag	Source

URL	Date	SRC

URL	Date	SRC
https://cert-portal.siemens.com/productcert/pdf/ssa-661034.pdf	2022-08-10

URL	Date	SRC

Affected Vendors, Products, and Versions

Vendor		Product				Version		Other		Status
Vendor	Product	Version	Other	Status	<-- -->	Vendor	Product	Version	Other	Status
Siemens Search vendor "Siemens"	Simatic Pcs 7 Firmware Search vendor "Siemens" for product "Simatic Pcs 7 Firmware"	<= 8.2 Search vendor "Siemens" for product "Simatic Pcs 7 Firmware" and version " <= 8.2"	-	Affected	in	Siemens Search vendor "Siemens"	Simatic Pcs 7 Search vendor "Siemens" for product "Simatic Pcs 7"	-	-	Safe
Siemens Search vendor "Siemens"	Simatic Pcs 7 Firmware Search vendor "Siemens" for product "Simatic Pcs 7 Firmware"	9.0 Search vendor "Siemens" for product "Simatic Pcs 7 Firmware" and version "9.0"	-	Affected	in	Siemens Search vendor "Siemens"	Simatic Pcs 7 Search vendor "Siemens" for product "Simatic Pcs 7"	-	-	Safe
Siemens Search vendor "Siemens"	Simatic Pdm Firmware Search vendor "Siemens" for product "Simatic Pdm Firmware"	-	-	Affected	in	Siemens Search vendor "Siemens"	Simatic Pdm Search vendor "Siemens" for product "Simatic Pdm"	-	-	Safe
Siemens Search vendor "Siemens"	Simatic Step 7 Firmware Search vendor "Siemens" for product "Simatic Step 7 Firmware"	>= 5.0 < 5.7 Search vendor "Siemens" for product "Simatic Step 7 Firmware" and version " >= 5.0 < 5.7"	-	Affected	in	Siemens Search vendor "Siemens"	Simatic Step 7 Search vendor "Siemens" for product "Simatic Step 7"	-	-	Safe
Siemens Search vendor "Siemens"	Sinamics Starter Firmware Search vendor "Siemens" for product "Sinamics Starter Firmware"	< 5.4 Search vendor "Siemens" for product "Sinamics Starter Firmware" and version " < 5.4"	-	Affected	in	Siemens Search vendor "Siemens"	Sinamics Starter Search vendor "Siemens" for product "Sinamics Starter"	-	-	Safe
Siemens Search vendor "Siemens"	Sinamics Starter Firmware Search vendor "Siemens" for product "Sinamics Starter Firmware"	5.4 Search vendor "Siemens" for product "Sinamics Starter Firmware" and version "5.4"	-	Affected	in	Siemens Search vendor "Siemens"	Sinamics Starter Search vendor "Siemens" for product "Sinamics Starter"	-	-	Safe
Siemens Search vendor "Siemens"	Sinamics Starter Firmware Search vendor "Siemens" for product "Sinamics Starter Firmware"	5.4 Search vendor "Siemens" for product "Sinamics Starter Firmware" and version "5.4"	hf1	Affected	in	Siemens Search vendor "Siemens"	Sinamics Starter Search vendor "Siemens" for product "Sinamics Starter"	-	-	Safe
Siemens Search vendor "Siemens"	Sinamics Starter Firmware Search vendor "Siemens" for product "Sinamics Starter Firmware"	5.4 Search vendor "Siemens" for product "Sinamics Starter Firmware" and version "5.4"	hf2	Affected	in	Siemens Search vendor "Siemens"	Sinamics Starter Search vendor "Siemens" for product "Sinamics Starter"	-	-	Safe
Siemens Search vendor "Siemens"	Sinamics Starter Firmware Search vendor "Siemens" for product "Sinamics Starter Firmware"	5.4 Search vendor "Siemens" for product "Sinamics Starter Firmware" and version "5.4"	sp1	Affected	in	Siemens Search vendor "Siemens"	Sinamics Starter Search vendor "Siemens" for product "Sinamics Starter"	-	-	Safe
Siemens Search vendor "Siemens"	Sinamics Starter Firmware Search vendor "Siemens" for product "Sinamics Starter Firmware"	5.4 Search vendor "Siemens" for product "Sinamics Starter Firmware" and version "5.4"	sp1_hf1	Affected	in	Siemens Search vendor "Siemens"	Sinamics Starter Search vendor "Siemens" for product "Sinamics Starter"	-	-	Safe
Siemens Search vendor "Siemens"	Sinamics Starter Firmware Search vendor "Siemens" for product "Sinamics Starter Firmware"	5.4 Search vendor "Siemens" for product "Sinamics Starter Firmware" and version "5.4"	sp2	Affected	in	Siemens Search vendor "Siemens"	Sinamics Starter Search vendor "Siemens" for product "Sinamics Starter"	-	-	Safe