CyberSecBulletin
CVE-2022-47391NVD status: Analyzed

In multiple CODESYS products in multiple versions an unauthorized, remote attacker may use a…

Published Updated By the CyberSecBulletin desk

CVE-2022-47391 is a high-severity improper input validation vulnerability in CODESYS Control RTE (SL) from Codesys, with a CVSS 3.1 base score of 7.5 out of 10. It can be exploited remotely over the network by an unauthenticated attacker, without any action from a user. The record lists version V3.5.19.0 as the first without the flaw, so updating CODESYS Control RTE (SL) to that release or later removes the exposure. There is no confirmed exploitation so far. EPSS estimates a 1.86% chance of exploitation within 30 days, higher than 80% of scored CVEs.

Next patch cycle

High severity with no evidence of exploitation so far.

What to do

  1. Update CODESYS Control RTE (SL) to V3.5.19.0 or a later version.
  2. Update CODESYS Control RTE (for Beckhoff CX) SL to V3.5.19.0 or a later version.
  3. Update CODESYS Control Win (SL) to V3.5.19.0 or a later version.
  4. Read the advisory on customers.codesys.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.

Affected products and versions

VendorProductAffected versionsFixed in
CODESYSCODESYS Control RTE (SL)V0.0.0.0 up to, but not including, V3.5.19.0V3.5.19.0
CODESYSCODESYS Control RTE (for Beckhoff CX) SLV0.0.0.0 up to, but not including, V3.5.19.0V3.5.19.0
CODESYSCODESYS Control Win (SL)V0.0.0.0 up to, but not including, V3.5.19.0V3.5.19.0
CODESYSCODESYS Control Runtime System ToolkitV0.0.0.0 up to, but not including, V3.5.19.0V3.5.19.0
CODESYSCODESYS Safety SIL2 Runtime ToolkitV0.0.0.0 up to, but not including, V3.5.19.0V3.5.19.0
CODESYSCODESYS Safety SIL2 PSPV0.0.0.0 up to, but not including, V3.5.19.0V3.5.19.0
CODESYSCODESYS Edge Gateway for WindowsV0.0.0.0 up to, but not including, V3.5.19.0V3.5.19.0
CODESYSCODESYS GatewayV0.0.0.0 up to, but not including, V3.5.19.0V3.5.19.0
CODESYSCODESYS HMI (SL)V0.0.0.0 up to, but not including, V3.5.19.0V3.5.19.0
CODESYSCODESYS Development System V3V0.0.0.0 up to, but not including, V3.5.19.0V3.5.19.0
CODESYSCODESYS Control for BeagleBone SLV0.0.0.0 up to, but not including, V4.8.0.0V4.8.0.0
CODESYSCODESYS Control for emPC-A/iMX6 SLV0.0.0.0 up to, but not including, V4.8.0.0V4.8.0.0
CODESYSCODESYS Control for IOT2000 SLV0.0.0.0 up to, but not including, V4.8.0.0V4.8.0.0
CODESYSCODESYS Control for Linux SLV0.0.0.0 up to, but not including, V4.8.0.0V4.8.0.0
CODESYSCODESYS Control for PFC100 SLV0.0.0.0 up to, but not including, V4.8.0.0V4.8.0.0
CODESYSCODESYS Control for PFC200 SLV0.0.0.0 up to, but not including, V4.8.0.0V4.8.0.0
CODESYSCODESYS Control for PLCnext SLV0.0.0.0 up to, but not including, V4.8.0.0V4.8.0.0
CODESYSCODESYS Control for Raspberry Pi SLV0.0.0.0 up to, but not including, V4.8.0.0V4.8.0.0
CODESYSCODESYS Control for WAGO Touch Panels 600 SLV0.0.0.0 up to, but not including, V4.8.0.0V4.8.0.0
CODESYSCODESYS Edge Gateway for LinuxV0.0.0.0 up to, but not including, V4.8.0.0V4.8.0.0
CodesysControl For Beaglebone Slbefore 4.8.0.04.8.0.0
CodesysControl For Empc-a/imx6 Slbefore 4.8.0.04.8.0.0
CodesysControl For Iot2000 Slbefore 4.8.0.04.8.0.0
CodesysControl For Linux Slbefore 4.8.0.04.8.0.0
CodesysControl For Pfc100 Slbefore 4.8.0.04.8.0.0

Version data comes from the organisation that assigned the CVE; 12 further products are omitted here. 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
NoneNo action by a victim is required.
Scope
UnchangedImpact stays within the vulnerable component.
Confidentiality
NoneNo data is disclosed.
Integrity
NoneNothing can be modified.
Availability
HighThe component can be taken down completely.

Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H. Scored by CNA (cert.vde.com).

Official description

In multiple CODESYS products in multiple versions an unauthorized, remote attacker may use a improper input validation vulnerability to read from invalid addresses leading to a denial of service.

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

The underlying weakness: Improper Input Validation

The product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly.

How developers prevent this class of flaw

  • Consider using language-theoretic security (LangSec) techniques that characterize inputs using a formal language and build recognizers for that language. This effectively requires parsing to be a distinct layer that effectively enforces a boundary between raw input and internal data representations, instead of allowing parser code to be scattered throughout the program, where it could be subject to errors or inconsistencies that create weaknesses.
  • Use an input validation framework such as Struts or the OWASP ESAPI Validation API. Note that using a framework does not automatically address all input validation problems; be mindful of weaknesses that could arise from misusing the framework itself (CWE-1173).
  • Understand all the potential areas where untrusted inputs can enter the product, including but not limited to: parameters or arguments, cookies, anything read from the network, environment variables, reverse DNS lookups, query results, request headers, URL components, e-mail, files, filenames, databases, and any external systems that provide data to the application. Remember that such inputs may be obtained indirectly through API calls.

More Improper Input Validation vulnerabilities (CWE-20)

Timeline

  1. CVE record published.
  2. CISA published its SSVC assessment (exploitation: none, automatable: yes, technical impact: partial).
  3. Record last changed materially (score, affected products, status or references).

References

Other vulnerabilities in CODESYS Control RTE (SL)

All CODESYS Control RTE (SL) vulnerabilities

Recent Improper Input Validation vulnerabilities

Spotted an error? Tell us.