CyberSecBulletin
CVE-2022-36331NVD status: Modified

My Cloud OS 5: Authentication Bypass by Spoofing

Published Updated By the CyberSecBulletin desk

CVE-2022-36331 is a high-severity authentication bypass by spoofing vulnerability in My Cloud OS 5 from Western Digital, 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 5.25.132 as the first without the flaw, so updating My Cloud OS 5 to that release or later removes the exposure. There is no confirmed exploitation so far. EPSS estimates a 0.59% 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 My Cloud OS 5 to 5.25.132 or a later version.
  2. Update My Cloud Home and My Cloud Home Duo to 8.13.1-102 or a later version.
  3. Update ibi to 8.13.1-102 or a later version.
  4. Read the advisory on westerndigital.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
Western DigitalMy Cloud OS 5before 5.25.1325.25.132
Western DigitalMy Cloud Home and My Cloud Home Duobefore 8.13.1-1028.13.1-102
SanDiskibibefore 8.13.1-1028.13.1-102
WesterndigitalMy Cloud Pr2100 Firmwarebefore 5.25.1325.25.132
WesterndigitalMy Cloud Pr4100 Firmwarebefore 5.25.1325.25.132
WesterndigitalMy Cloud Ex4100 Firmwarebefore 5.25.1325.25.132
WesterndigitalMy Cloud Ex2 Ultra Firmwarebefore 5.25.1325.25.132
WesterndigitalMy Cloud Mirror G2 Firmwarebefore 5.25.1325.25.132
WesterndigitalMy Cloud Dl2100 Firmwarebefore 5.25.1325.25.132
WesterndigitalMy Cloud Dl4100 Firmwarebefore 5.25.1325.25.132
WesterndigitalMy Cloud Ex2100 Firmwarebefore 5.25.1325.25.132
WesterndigitalMy Cloud Home Firmwarebefore 8.13.1-1028.13.1-102
WesterndigitalMy Cloud Home Duo Firmwarebefore 8.13.1-1028.13.1-102
WesterndigitalSandisk Ibi Firmwarebefore 8.13.1-1028.13.1-102
WesterndigitalMy Cloud Firmwarebefore 5.25.1325.25.132

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
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
NoneNothing can be modified.
Availability
NoneAvailability is not affected.

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

Scoring systemScoreSeverityScored by
CVSS 3.110.0CriticalCNA (wdc.com)
CVSS 3.17.5HighNVD

Official description

Western Digital My Cloud, My Cloud Home, My Cloud Home Duo, and SanDisk ibi devices were vulnerable to an impersonation attack that could allow an unauthenticated attacker to gain access to user data. This issue affects My Cloud OS 5 devices: before 5.25.132; My Cloud Home and My Cloud Home Duo: before 8.13.1-102; SanDisk ibi: before 8.13.1-102.

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

The underlying weakness: Authentication Bypass by Spoofing

This attack-focused weakness is caused by incorrectly implemented authentication schemes that are subject to spoofing attacks.

More Authentication Bypass by Spoofing vulnerabilities (CWE-290)

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 My Cloud OS 5

All My Cloud OS 5 vulnerabilities

Recent Authentication Bypass by Spoofing vulnerabilities

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