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8.8
HIGH CVSS 3.1
CVE-2021-31894
Siemens SIMATIC PCS 7/STEP 7/PDM SINAMICS STARTER File Write Permission Vulnerability
Description

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.

INFO

Published Date :

July 13, 2021, 11:15 a.m.

Last Modified :

Nov. 21, 2024, 6:06 a.m.

Remotely Exploit :

No

Source :

[email protected]
Affected Products

The following products are affected by CVE-2021-31894 vulnerability. Even if cvefeed.io is aware of the exact versions of the products that are affected, the information is not represented in the table below.

ID Vendor Product Action
1 Siemens simatic_pdm_firmware
2 Siemens simatic_step_7_firmware
3 Siemens sinamics_starter_firmware
4 Siemens simatic_pcs_7_firmware
5 Siemens simatic_pdm
6 Siemens simatic_step_7
7 Siemens sinamics_starter
8 Siemens simatic_pcs_7
: Total Affected Vendor : 1 | Products : 8
CVSS Scores
The Common Vulnerability Scoring System is a standardized framework for assessing the severity of vulnerabilities in software and systems. We collect and displays CVSS scores from various sources for each CVE.
Score Version Severity Vector Exploitability Score Impact Score Source
CVSS 2.0 HIGH [email protected]
CVSS 3.1 HIGH [email protected]
References to Advisories, Solutions, and Tools

Here, you will find a curated list of external links that provide in-depth information, practical solutions, and valuable tools related to CVE-2021-31894.

URL Resource
https://cert-portal.siemens.com/productcert/pdf/ssa-661034.pdf Patch Vendor Advisory
https://cert-portal.siemens.com/productcert/pdf/ssa-661034.pdf Patch Vendor Advisory
CWE - Common Weakness Enumeration

While CVE identifies specific instances of vulnerabilities, CWE categorizes the common flaws or weaknesses that can lead to vulnerabilities. CVE-2021-31894 is associated with the following CWEs:

Common Attack Pattern Enumeration and Classification (CAPEC)

Common Attack Pattern Enumeration and Classification (CAPEC) stores attack patterns, which are descriptions of the common attributes and approaches employed by adversaries to exploit the CVE-2021-31894 weaknesses.

We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).

Results are limited to the first 15 repositories due to potential performance issues.

The following list is the news that have been mention CVE-2021-31894 vulnerability anywhere in the article.

Results are limited to the first 20 news articles due to potential performance issues.

The following table lists the changes that have been made to the CVE-2021-31894 vulnerability over time.

Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.

  • CVE Modified by af854a3a-2127-422b-91ae-364da2661108

    Nov. 21, 2024

    Action Type Old Value New Value
    Added Reference https://cert-portal.siemens.com/productcert/pdf/ssa-661034.pdf
  • CVE Modified by [email protected]

    May. 14, 2024

    Action Type Old Value New Value
  • CVE Modified by [email protected]

    Aug. 10, 2022

    Action Type Old Value New Value
    Changed Description 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. 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.
  • CVE Modified by [email protected]

    Aug. 10, 2022

    Action Type Old Value New Value
    Changed Description A vulnerability has been identified in SIMATIC PCS 7 V8.2 and earlier (All versions), SIMATIC PCS 7 V9.X (All versions), SIMATIC PDM (All versions), 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. 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.
  • Modified Analysis by [email protected]

    Jul. 01, 2022

    Action Type Old Value New Value
    Changed CPE Configuration AND OR *cpe:2.3:o:siemens:simatic_pcs_7_firmware:*:*:*:*:*:*:*:* versions up to (including) 8.2 OR cpe:2.3:h:siemens:simatic_pcs_7:-:*:*:*:*:*:*:* AND OR *cpe:2.3:o:siemens:simatic_pcs_7_firmware:*:*:*:*:*:*:*:* versions up to (including) 8.2 *cpe:2.3:o:siemens:simatic_pcs_7_firmware:9.0:*:*:*:*:*:*:* OR cpe:2.3:h:siemens:simatic_pcs_7:-:*:*:*:*:*:*:*
    Changed CPE Configuration AND OR *cpe:2.3:o:siemens:simatic_step_7_firmware:*:*:*:*:*:*:*:* versions up to (excluding) 5.7 OR cpe:2.3:h:siemens:simatic_step_7:-:*:*:*:*:*:*:* AND OR *cpe:2.3:o:siemens:simatic_step_7_firmware:*:*:*:*:*:*:*:* versions from (including) 5.0 up to (excluding) 5.7 OR cpe:2.3:h:siemens:simatic_step_7:-:*:*:*:*:*:*:*
    Changed CPE Configuration AND OR *cpe:2.3:o:siemens:sinamics_starter_firmware:-:*:*:*:*:*:*:* OR cpe:2.3:h:siemens:sinamics_starter:-:*:*:*:*:*:*:* AND OR *cpe:2.3:o:siemens:sinamics_starter_firmware:*:*:*:*:*:*:*:* versions up to (excluding) 5.4 *cpe:2.3:o:siemens:sinamics_starter_firmware:5.4:-:*:*:*:*:*:* *cpe:2.3:o:siemens:sinamics_starter_firmware:5.4:hf1:*:*:*:*:*:* *cpe:2.3:o:siemens:sinamics_starter_firmware:5.4:hf2:*:*:*:*:*:* *cpe:2.3:o:siemens:sinamics_starter_firmware:5.4:sp1:*:*:*:*:*:* *cpe:2.3:o:siemens:sinamics_starter_firmware:5.4:sp1_hf1:*:*:*:*:*:* *cpe:2.3:o:siemens:sinamics_starter_firmware:5.4:sp2:*:*:*:*:*:* OR cpe:2.3:h:siemens:sinamics_starter:-:*:*:*:*:*:*:*
  • CVE Modified by [email protected]

    Sep. 14, 2021

    Action Type Old Value New Value
    Changed Description A vulnerability has been identified in SIMATIC PCS 7 V8.2 and earlier (All versions), SIMATIC PCS 7 V9.X (All versions), SIMATIC PDM (All versions), SIMATIC STEP 7 V5.X (All versions < V5.7), SINAMICS STARTER (containing STEP 7 OEM version) (All versions). 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. A vulnerability has been identified in SIMATIC PCS 7 V8.2 and earlier (All versions), SIMATIC PCS 7 V9.X (All versions), SIMATIC PDM (All versions), 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.
  • Initial Analysis by [email protected]

    Aug. 06, 2021

    Action Type Old Value New Value
    Added CVSS V2 NIST (AV:L/AC:L/Au:N/C:C/I:C/A:C)
    Added CVSS V3.1 NIST AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
    Changed Reference Type https://cert-portal.siemens.com/productcert/pdf/ssa-661034.pdf No Types Assigned https://cert-portal.siemens.com/productcert/pdf/ssa-661034.pdf Patch, Vendor Advisory
    Added CPE Configuration AND OR *cpe:2.3:o:siemens:simatic_pcs_7_firmware:*:*:*:*:*:*:*:* versions up to (including) 8.2 OR cpe:2.3:h:siemens:simatic_pcs_7:-:*:*:*:*:*:*:*
    Added CPE Configuration AND OR *cpe:2.3:o:siemens:simatic_pdm_firmware:-:*:*:*:*:*:*:* OR cpe:2.3:h:siemens:simatic_pdm:-:*:*:*:*:*:*:*
    Added CPE Configuration AND OR *cpe:2.3:o:siemens:simatic_step_7_firmware:*:*:*:*:*:*:*:* versions up to (excluding) 5.7 OR cpe:2.3:h:siemens:simatic_step_7:-:*:*:*:*:*:*:*
    Added CPE Configuration AND OR *cpe:2.3:o:siemens:sinamics_starter_firmware:-:*:*:*:*:*:*:* OR cpe:2.3:h:siemens:sinamics_starter:-:*:*:*:*:*:*:*
  • CVE Modified by [email protected]

    Jul. 13, 2021

    Action Type Old Value New Value
    Changed Description A vulnerability has been identified in SIMATIC PCS 7 V8.2 and earlier (All versions), SIMATIC PCS 7 V9.X (All versions), SIMATIC PDM (All versions), SIMATIC STEP 7 V5.X (All versions < V5.7), SINAMICS STARTER (containing STEP 7 OEM version) (All versions). 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. A vulnerability has been identified in SIMATIC PCS 7 V8.2 and earlier (All versions), SIMATIC PCS 7 V9.X (All versions), SIMATIC PDM (All versions), SIMATIC STEP 7 V5.X (All versions < V5.7), SINAMICS STARTER (containing STEP 7 OEM version) (All versions). 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.
EPSS is a daily estimate of the probability of exploitation activity being observed over the next 30 days. Following chart shows the EPSS score history of the vulnerability.
Vulnerability Scoring Details
Base CVSS Score: 8.8
Attack Vector
Attack Complexity
Privileges Required
User Interaction
Scope
Confidentiality Impact
Integrity Impact
Availability Impact
Base CVSS Score: 7.2
Access Vector
Access Complexity
Authentication
Confidentiality Impact
Integrity Impact
Availability Impact
Exploit Prediction

EPSS is a daily estimate of the probability of exploitation activity being observed over the next 30 days.

0.03 }} -0.05%

score

0.06329

percentile