8.8
HIGH
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 :

Aug. 10, 2022, 8:28 p.m.

Source :

[email protected]

Remotely Exploitable :

No

Impact Score :

6.0

Exploitability Score :

2.0
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
: Total Affected Vendor : 1 | Products : 4
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

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.

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 [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.
Exploit Prediction

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

0.04 }} 0.00%

score

0.10264

percentile

CVSS31 - Vulnerability Scoring System
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