Improper Authentication in Western Digital MyCloud products

1) Improper Authentication

EUVDB-ID: #VU49038

Risk: High

CVSSv4.0: 8.1 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Amber]

CVE-ID: CVE-2020-29563

CWE-ID: CWE-287 - Improper Authentication

Exploit availability: No

Description

The vulnerability allows a remote attacker to bypass authentication process.

The vulnerability exists due to an error when processing authentication requests within the mod_rewrite module. A remote attacker can bypass authentication process and gain unauthorized access to the application.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

My Cloud PR2100: before 5.07.118

My Cloud PR4100: before 5.07.118

My Cloud EX2 Ultra: before 5.07.118

My Cloud EX4100: before 5.07.118

My Cloud Mirror Gen 2: before 5.07.118

CPE2.3

• cpe:2.3:h:western_digital:my_cloud_pr2100:*:*:*:*:*:*:*:*
• cpe:2.3:h:western_digital:my_cloud_pr4100:*:*:*:*:*:*:*:*
• cpe:2.3:h:western_digital:my_cloud_ex2_ultra:*:*:*:*:*:*:*:*
• cpe:2.3:h:western_digital:my_cloud_ex4100:*:*:*:*:*:*:*:*
• cpe:2.3:h:western_digital:my_cloud_mirror_gen_2:*:*:*:*:*:*:*:*

External links

https://www.westerndigital.com/support/productsecurity/wdc-20010-my-cloud-os5-firmware-5-07-118
https://www.zerodayinitiative.com/advisories/ZDI-20-1446/

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.