CyberSecBulletin
CVE-2023-40158NVD status: Modified

NR4H, NR8H, NR16H series: Hidden Functionality

Published Updated By the CyberSecBulletin desk

CVE-2023-40158 is a high-severity hidden functionality 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 1.28% chance of exploitation within 30 days, higher than 71% 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
Cbcdr-4fall versionsNot stated
Cbcdr-16hall versionsNot stated
Cbcdr-8hall versionsNot stated
Cbcdr-4hall versionsNot stated
Cbcdr-4m41all versionsNot stated
Cbcnr-4mall versionsNot stated
Cbcnr4hall versionsNot stated
Cbcnr8hall versionsNot stated
Cbcnr16hall versionsNot stated
Cbcdr-16fall versionsNot stated
Cbcdr-8fall versionsNot stated
Cbcnr-8mall versionsNot stated
Cbcnr-16mall versionsNot stated
Cbcnr-4fall versionsNot stated
Cbcnr-8fall versionsNot stated
Cbcnr-16fall versionsNot stated
Cbcdr-16mall versionsNot stated
Cbcdr-8mall versionsNot stated
Cbcdr-4m51all versionsNot stated
CbcNr4h FirmwareNot specified in the recordNot stated

Version data comes from the organisation that assigned the CVE; 22 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.

Scoring systemScoreSeverityScored by
CVSS 3.18.8HighNVD
CVSS 3.18.8HighCISA (ADP)

Official description

Hidden functionality 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: Hidden Functionality

The product contains functionality that is not documented, not part of the specification, and not accessible through an interface or command sequence that is obvious to the product's users or administrators.

How developers prevent this class of flaw

  • Always verify the integrity of the product that is being installed.

More Hidden Functionality vulnerabilities (CWE-912)

Timeline

  1. CVE record published.
  2. CISA published its SSVC assessment (exploitation: none, automatable: no, technical impact: total).
  3. 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 Hidden Functionality vulnerabilities

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