PT-2021-7664 · Western Digital · Western Digital My Cloud

Pedro Ribeiro + 1 · Published 2021-07-02 · Updated 2023-02-14 · CVE-2021-36226

Positive Technologies (AI Summary)

CVSS v3.1

9.8

Critical

Base vector

AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Name of the Vulnerable Software and Affected Versions Western Digital My Cloud devices before OS5

Description The issue is related to incorrect cryptographic signature verification in the Western Digital MyCloud PR4100 firmware. This could allow a remote attacker to execute arbitrary code. The problem arises because Western Digital My Cloud devices before OS5 do not use cryptographically signed firmware upgrade files.

Recommendations For Western Digital My Cloud devices before OS5, consider updating to OS5 or later to address the issue of unsigned firmware upgrade files, as this update likely includes cryptographically signed firmware upgrades. At the moment, there is no information about additional mitigation measures for this specific issue.

Exploit

Fix

Improper Verification of Cryptographic Signature

Insufficient Verification of Data Authenticity

Weakness Enumeration

CWE-347

CWE-345

Related Identifiers

BDU:2023-01118

CVE-2021-36226

Affected Products

Western Digital My Cloud

References · 8

• 🔥 https://github.com/pedrib/PoC/blob/master/advisories/Pwn2Own/Tokyo_2020/weekend_destroyer/weekend_destroyer.md · Exploit
• 🔥 https://krebsonsecurity.com/2021/07/another-0-day-looms-for-many-western-digital-users · Exploit
• 🔥 https://youtube.com/watch?v=vsg9YgvGBec · Exploit
• https://bdu.fstec.ru/vul/2023-01118 · Security Note
• https://nvd.nist.gov/vuln/detail/CVE-2021-36226 · Security Note
• https://osv.dev/vulnerability/CVE-2021-36226 · Vendor Advisory
• https://t.me/cibsecurity/57541 · Telegram Post
• https://t.me/cvenotify/43675 · Telegram Post