CyberSecBulletin
CVE-2022-40179NVD status: Modified

Desigo PXM30-1: Cross-Site Request Forgery

Published Updated By the CyberSecBulletin desk

CVE-2022-40179 is a high-severity cross-site request forgery vulnerability in Desigo PXM30-1 from Siemens, with a CVSS 3.1 base score of 8.1 out of 10. It can be exploited remotely over the network by an unauthenticated attacker, but only if a user takes part, for example by opening a link or file. Affected Desigo PXM30-1 versions: All versions < V02.20.126.11-41. The record does not name a fixed version, so check the vendor advisory. There is no confirmed exploitation so far. EPSS estimates a 0.37% chance of exploitation within 30 days, which is low compared with other CVEs.

Next patch cycle

High severity with no evidence of exploitation so far.

What to do

  1. Update Desigo Pxm30-1 Firmware to 02.20.126.11-41 or a later version.
  2. Update Desigo Pxm30.e Firmware to 02.20.126.11-41 or a later version.
  3. Update Desigo Pxm40-1 Firmware to 02.20.126.11-41 or a later version.
  4. Read the advisory on cert-portal.siemens.com for workarounds and exact fixed builds.
  5. Until you can update, restrict network access to the affected service so it is not reachable from untrusted networks.
  6. Because the attack needs a user to take part, warn users about unexpected links and files related to this product until it is patched.

Affected products and versions

VendorProductAffected versionsFixed in
SiemensDesigo PXM30-1All versions < V02.20.126.11-41Not stated
SiemensDesigo PXM30.EAll versions < V02.20.126.11-41Not stated
SiemensDesigo PXM40-1All versions < V02.20.126.11-41Not stated
SiemensDesigo PXM40.EAll versions < V02.20.126.11-41Not stated
SiemensDesigo PXM50-1All versions < V02.20.126.11-41Not stated
SiemensDesigo PXM50.EAll versions < V02.20.126.11-41Not stated
SiemensPXG3.W100-1All versions < V02.20.126.11-37Not stated
SiemensPXG3.W100-2All versions < V02.20.126.11-41Not stated
SiemensPXG3.W200-1All versions < V02.20.126.11-37Not stated
SiemensPXG3.W200-2All versions < V02.20.126.11-41Not stated
SiemensDesigo Pxm30-1 Firmwarebefore 02.20.126.11-4102.20.126.11-41
SiemensDesigo Pxm30.e Firmwarebefore 02.20.126.11-4102.20.126.11-41
SiemensDesigo Pxm40-1 Firmwarebefore 02.20.126.11-4102.20.126.11-41
SiemensDesigo Pxm40.e Firmwarebefore 02.20.126.11-4102.20.126.11-41
SiemensDesigo Pxm50-1 Firmwarebefore 02.20.126.11-4102.20.126.11-41
SiemensDesigo Pxm50.e Firmwarebefore 02.20.126.11-4102.20.126.11-41
SiemensPxg3.w100-1 Firmwarebefore 02.20.126.11-3702.20.126.11-37
SiemensPxg3.w100-2 Firmwarebefore 02.20.126.11-4102.20.126.11-41
SiemensPxg3.w200-1 Firmwarebefore 02.20.126.11-3702.20.126.11-37
SiemensPxg3.w200-2 Firmwarebefore 02.20.126.11-4102.20.126.11-41

Version data comes from the organisation that assigned the CVE. Confirm against the vendor advisory before deciding you are unaffected.

How the severity score breaks down

Attack vector
NetworkCan be exploited remotely over a network, including the internet.
Attack complexity
LowNo special conditions are needed; the attack works reliably.
Privileges required
NoneNo account or login is needed.
User interaction
RequiredA user must take an action such as opening a file or link.
Scope
UnchangedImpact stays within the vulnerable component.
Confidentiality
HighAll data handled by the component can be read.
Integrity
HighData or code can be modified at will.
Availability
NoneAvailability is not affected.

Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N. Scored by NVD.

Official description

A vulnerability has been identified in Desigo PXM30-1 (All versions < V02.20.126.11-41), Desigo PXM30.E (All versions < V02.20.126.11-41), Desigo PXM40-1 (All versions < V02.20.126.11-41), Desigo PXM40.E (All versions < V02.20.126.11-41), Desigo PXM50-1 (All versions < V02.20.126.11-41), Desigo PXM50.E (All versions < V02.20.126.11-41), PXG3.W100-1 (All versions < V02.20.126.11-37), PXG3.W100-2 (All versions < V02.20.126.11-41), PXG3.W200-1 (All versions < V02.20.126.11-37), PXG3.W200-2 (All versions < V02.20.126.11-41). A Cross-Site Request Forgery exists in endpoints of the “Operation” web application that interpret and execute Axon language queries, due to the missing validation of anti-CSRF tokens or other origin checks. By convincing a victim to click on a malicious link or visit a specifically crafted webpage while logged-in to the device web application, a remote unauthenticated attacker can execute arbitrary Axon queries against the device.

Source: the CVE record as published by its numbering authority, via NVD and CVE.org.

The underlying weakness: Cross-Site Request Forgery

The web application does not, or cannot, sufficiently verify whether a request was intentionally provided by the user who sent the request, which could have originated from an unauthorized actor.

How developers prevent this class of flaw

  • Use a vetted library or framework that does not allow this weakness to occur or provides constructs that make this weakness easier to avoid. For example, use anti-CSRF packages such as the OWASP CSRFGuard. Another example is the ESAPI Session Management control, which includes a component for CSRF.
  • Ensure that the application is free of cross-site scripting issues (CWE-79), because most CSRF defenses can be bypassed using attacker-controlled script.
  • Generate a unique nonce for each form, place the nonce into the form, and verify the nonce upon receipt of the form. Be sure that the nonce is not predictable (CWE-330).

More Cross-Site Request Forgery vulnerabilities (CWE-352)

Timeline

  1. CVE record published.
  2. Record last changed materially (score, affected products, status or references).

References

Other vulnerabilities in Desigo PXM30-1

All Desigo PXM30-1 vulnerabilities

Recent Cross-Site Request Forgery vulnerabilities

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