Advisory Details

March 11th, 2021

Western Digital MyCloud PR4100 Link Resolution Information Disclosure Vulnerability

ZDI-21-277
ZDI-CAN-12455

CVE ID CVE-2021-3310
CVSS SCORE 7.5, (AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N)
AFFECTED VENDORS Western Digital
AFFECTED PRODUCTS MyCloud PR4100
VULNERABILITY DETAILS

This vulnerability allows remote attackers to disclose sensitive information on affected installations of Western Digital MyCloud PR4100. Authentication is not required to exploit this vulnerability.

The specific flaw exists within the SMB and AFP services. By creating a symbolic link, an attacker can abuse the service to read arbitrary files. An attacker can leverage this vulnerability to disclose information in the context of the service account.

ADDITIONAL DETAILS Western Digital has issued an update to correct this vulnerability. More details can be found at:
https://www.westerndigital.com/support/productsecurity/wdc-21002-my-cloud-firmware-version-5-10-122
DISCLOSURE TIMELINE
  • 2021-01-05 - Vulnerability reported to vendor
  • 2021-03-11 - Coordinated public release of advisory
CREDIT Chris Hernandez
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