CyberSecBulletin
CVE-2022-22995NVD status: Modified

My Cloud: Improper Link Resolution Before File Access

Published Updated By the CyberSecBulletin desk

CVE-2022-22995 is a critical-severity improper link resolution before file access vulnerability in My Cloud from Western Digital, 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. The record lists version 5.19.117 as the first without the flaw, so updating My Cloud to that release or later removes the exposure. There is no confirmed exploitation so far. EPSS estimates a 2.73% chance of exploitation within 30 days, higher than 86% of scored CVEs.

Patch this week

Critical severity: a successful attack would have severe impact.

What to do

  1. Update My Cloud to 5.19.117 or a later version.
  2. Update My Cloud Home to 7.16-220 or a later version.
  3. Update My Cloud Pr2100 Firmware to 5.19.117 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 CloudMy Cloud OS 5 up to, but not including, 5.19.1175.19.117
Western DigitalMy Cloud HomeMy Cloud Home up to, but not including, 7.16-2207.16-220
WesterndigitalMy Cloud Pr2100 Firmwarebefore 5.19.1175.19.117
WesterndigitalMy Cloud Pr4100 Firmwarebefore 5.19.1175.19.117
WesterndigitalMy Cloud Ex4100 Firmwarebefore 5.19.1175.19.117
WesterndigitalMy Cloud Ex2 Ultra Firmwarebefore 5.19.1175.19.117
WesterndigitalMy Cloud Mirror Gen 2 Firmwarebefore 5.19.1175.19.117
WesterndigitalMy Cloud Dl2100 Firmwarebefore 5.19.1175.19.117
WesterndigitalMy Cloud Dl4100 Firmwarebefore 5.19.1175.19.117
WesterndigitalMy Cloud Ex2100 Firmwarebefore 5.19.1175.19.117
WesterndigitalMy Cloud Firmwarebefore 5.19.1175.19.117
WesterndigitalWd Cloud Firmwarebefore 5.19.1175.19.117
WesterndigitalMy Cloud Home Firmwarebefore 7.16-2207.16-220
NetatalkNetatalkbefore 3.1.183.1.18
Fedora ProjectFedora37; 38; 39Not stated

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
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 3.110.0CriticalCNA (wdc.com)
CVSS 3.19.8CriticalNVD
CVSS 2.07.5HighNVD

Official description

The combination of primitives offered by SMB and AFP in their default configuration allows the arbitrary writing of files. By exploiting these combination of primitives, an attacker can execute arbitrary code.

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

The underlying weakness: Improper Link Resolution Before File Access

The product attempts to access a file based on the filename, but it does not properly prevent that filename from identifying a link or shortcut that resolves to an unintended resource.

How developers prevent this class of flaw

  • Follow the principle of least privilege when assigning access rights to entities in a software system. Denying access to a file can prevent an attacker from replacing that file with a link to a sensitive file. Ensure good compartmentalization in the system to provide protected areas that can be trusted.

More Improper Link Resolution Before File Access vulnerabilities (CWE-59)

Timeline

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

References

Third-party and government advisories

Other vulnerabilities in My Cloud

All My Cloud vulnerabilities

Recent Improper Link Resolution Before File Access vulnerabilities

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