CyberSecBulletin
CVE-2023-40144NVD status: Modified

NR4H, NR8H, NR16H series: Improper Neutralization of Special Elements used in an OS Command

Published Updated By the CyberSecBulletin desk

CVE-2023-40144 is a high-severity improper neutralization of special elements used in an OS command vulnerability in NR4H, NR8H, NR16H series from Cbc, with a CVSS 3.1 base score of 8.8 out of 10. It can be exploited remotely over the network by an attacker with a low-privileged account, without any action from a user. Affected NR4H, NR8H, NR16H series versions: firmware all versions. The record does not name a fixed version, so check the vendor advisory. There is no confirmed exploitation so far. EPSS estimates a 2.14% chance of exploitation within 30 days, higher than 82% of scored CVEs.

Next patch cycle

High severity with no evidence of exploitation so far.

What to do

  1. Check which version of NR4H, NR8H, NR16H series you run against the affected versions below, and install the vendor's latest release.
  2. Read the advisory on ganzsecurity.com for workarounds and exact fixed builds.

Affected products and versions

VendorProductAffected versionsFixed in
CBCNR4H, NR8H, NR16H seriesfirmware all versionsNot stated
CBCDR-16F, DR-8F, DR-4F, DR-16H, DR-8H, DR-4H, DR-4M41 seriesfirmware all versionsNot stated
CBCNR-4M, NR-8M, NR-16M seriesfirmware all versionsNot stated
CBCNR-4F, NR-8F, NR-16F seriesfirmware all versionsNot stated
CBCDR-16M, DR-8M, DR-4M51 seriesfirmware all versionsNot stated
CbcNr4h FirmwareNot specified in the recordNot stated
CbcNr8h FirmwareNot specified in the recordNot stated
CbcNr16h FirmwareNot specified in the recordNot stated
CbcDr-16f42a FirmwareNot specified in the recordNot stated
CbcDr-16f45at FirmwareNot specified in the recordNot stated
CbcDr-8f42a FirmwareNot specified in the recordNot stated
CbcDr-8f45at FirmwareNot specified in the recordNot stated
CbcDr-4fx1 FirmwareNot specified in the recordNot stated
CbcDr-16h FirmwareNot specified in the recordNot stated
CbcDr-8h FirmwareNot specified in the recordNot stated
CbcDr-4h FirmwareNot specified in the recordNot stated
CbcDrh8-4m41-a FirmwareNot specified in the recordNot stated
CbcNr8-4m71 FirmwareNot specified in the recordNot stated
CbcNr8-8m72 FirmwareNot specified in the recordNot stated
CbcNr-16m FirmwareNot specified in the recordNot stated
CbcNr-16f85-8pra FirmwareNot specified in the recordNot stated
CbcNr-16f82-16p FirmwareNot specified in the recordNot stated
CbcNr-4f FirmwareNot specified in the recordNot stated
CbcNr-8f FirmwareNot specified in the recordNot stated
CbcDr-16m52 FirmwareNot specified in the recordNot stated

Version data comes from the organisation that assigned the CVE; 3 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
LowA basic user account is enough.
User interaction
NoneNo action by a victim is required.
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
HighThe component can be taken down completely.

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

Official description

OS command injection vulnerability in the CBC products allows a remote authenticated attacker to execute an arbitrary OS command on the device or alter its settings. As for the affected products/versions, see the detailed information provided by the vendor. Note that NR4H, NR8H, NR16H series and DR-16F, DR-8F, DR-4F, DR-16H, DR-8H, DR-4H, DR-4M41 series are no longer supported, therefore updates for those products are not provided.

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

The underlying weakness: Improper Neutralization of Special Elements used in an OS Command

The product constructs all or part of an OS command using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the intended OS command before it is sent to a downstream component.

How developers prevent this class of flaw

  • If at all possible, use library calls rather than external processes to recreate the desired functionality.
  • For any data that will be used to generate a command to be executed, keep as much of that data out of external control as possible. For example, in web applications, this may require storing the data locally in the session's state instead of sending it out to the client in a hidden form field.
  • For any security checks that are performed on the client side, ensure that these checks are duplicated on the server side, in order to avoid CWE-602. Attackers can bypass the client-side checks by modifying values after the checks have been performed, or by changing the client to remove the client-side checks entirely. Then, these modified values would be submitted to the server.

More Improper Neutralization of Special Elements used in an OS Command vulnerabilities (CWE-78)

Timeline

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

References

Third-party and government advisories

Other references

Other vulnerabilities in NR4H, NR8H, NR16H series

All NR4H, NR8H, NR16H series vulnerabilities

Recent Improper Neutralization of Special Elements used in an OS Command vulnerabilities

Spotted an error? Tell us.