CyberSecBulletin
CVE-2023-47674NVD status: Modified

CFR-904E, CFR-908E, CFR-916E: Missing Authentication for Critical Functionality

Published Updated By the CyberSecBulletin desk

CVE-2023-47674 is a critical-severity missing authentication for critical functionality vulnerability in CFR-904E, CFR-908E, CFR-916E from First, with a CVSS 3.1 base score of 9.8 out of 10. It can be exploited remotely over the network by an unauthenticated attacker, without any action from a user. Affected CFR-904E, CFR-908E, CFR-916E 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 1.26% chance of exploitation within 30 days, higher than 70% of scored CVEs.

Patch this week

Critical severity: a successful attack would have severe impact.

What to do

  1. Check which version of CFR-904E, CFR-908E, CFR-916E you run against the affected versions below, and install the vendor's latest release.
  2. Read the advisory on c-first.co.jp for workarounds and exact fixed builds.
  3. 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
FirstCFR-904E, CFR-908E, CFR-916Efirmware all versionsNot stated
FirstCFR-4EHD, CFR-8EHD, CFR-16EHDfirmware all versionsNot stated
FirstCFR-4EHA, CFR-8EHA, CFR-16EHAfirmware all versionsNot stated
FirstCFR-4EAAM, CFR-4EABCfirmware all versionsNot stated
FirstCFR-4EAA, CFR-8EAA, CFR-16EAAfirmware all versionsNot stated
FirstCFR-4EAB, CFR-8EAB, CFR-16EABfirmware all versionsNot stated
FirstCFR-1004EA, CFR-1008EA, CFR-1016EAfirmware all versionsNot stated
FirstMD-404HD, MD-808HDfirmware all versionsNot stated
FirstMD-404HA, MD-808HAfirmware all versionsNot stated
FirstMD-404AA, MD-808AAfirmware all versionsNot stated
FirstMD-404AB, MD-808ABfirmware all versionsNot stated
C-firstCfr-1004ea FirmwareNot specified in the recordNot stated
C-firstCfr-1008ea FirmwareNot specified in the recordNot stated
C-firstCfr-1016ea FirmwareNot specified in the recordNot stated
C-firstCfr-16eaa FirmwareNot specified in the recordNot stated
C-firstCfr-16eab FirmwareNot specified in the recordNot stated
C-firstCfr-16eha FirmwareNot specified in the recordNot stated
C-firstCfr-16ehd FirmwareNot specified in the recordNot stated
C-firstCfr-4eaa FirmwareNot specified in the recordNot stated
C-firstCfr-4eaam FirmwareNot specified in the recordNot stated
C-firstCfr-4eab FirmwareNot specified in the recordNot stated
C-firstCfr-4eabc FirmwareNot specified in the recordNot stated
C-firstCfr-4eha FirmwareNot specified in the recordNot stated
C-firstCfr-4ehd FirmwareNot specified in the recordNot stated
C-firstCfr-8eaa FirmwareNot specified in the recordNot stated

Version data comes from the organisation that assigned the CVE; 14 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
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:N/UI:N/S:U/C:H/I:H/A:H. Scored by NVD.

Scoring systemScoreSeverityScored by
CVSS 3.19.8CriticalNVD
CVSS 3.19.8CriticalCISA (ADP)

Official description

Missing authentication for critical function vulnerability in First Corporation's DVRs allows a remote unauthenticated attacker to rewrite or obtain the configuration information of the affected device. Note that updates are provided only for Late model of CFR-4EABC, CFR-4EAB, CFR-8EAB, CFR-16EAB, MD-404AB, and MD-808AB. As for the other products, apply the workaround.

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

The underlying weakness: Missing Authentication for Critical Functionality

The product does not perform any authentication for functionality that requires a provable user identity or consumes a significant amount of resources.

How developers prevent this class of flaw

  • 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.
  • 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, consider using libraries with authentication capabilities such as OpenSSL or the ESAPI Authenticator.
  • When storing data in the cloud (e.g., S3 buckets, Azure blobs, Google Cloud Storage, etc.), use the provider's controls to require strong authentication for users who should be allowed to access the data.

More Missing Authentication for Critical Functionality vulnerabilities (CWE-306)

Timeline

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

References

Third-party and government advisories

Other vulnerabilities in CFR-904E, CFR-908E, CFR-916E

All CFR-904E, CFR-908E, CFR-916E vulnerabilities

Recent Missing Authentication for Critical Functionality vulnerabilities

Spotted an error? Tell us.