#VU49032 Improper Authentication in Western Digital products - CVE-2020-28971

Vulnerability identifier: #VU49032

Vulnerability risk: Low

CVSSv4.0: 1.3 [CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2020-28971

CWE-ID: CWE-287

Exploitation vector: Local network

Exploit availability: No

Vulnerable software:
My Cloud PR2100
Hardware solutions / Other hardware appliances
My Cloud PR4100
Hardware solutions / Other hardware appliances
My Cloud EX2 Ultra
Hardware solutions / Other hardware appliances
My Cloud EX4100
Hardware solutions / Other hardware appliances
My Cloud Mirror Gen 2
Hardware solutions / Other hardware appliances

Vendor: Western Digital

Description

The vulnerability allows a remote attacker to bypass authentication process.

The vulnerability exists due to an error when processing authentication requests within the nasAdmin service. A remote attacker on the local network can bypass authentication process and execute arbitrary commands on the device.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

My Cloud PR2100: before 5.06.115

My Cloud PR4100: before 5.06.115

My Cloud EX2 Ultra: before 5.06.115

My Cloud EX4100: before 5.06.115

My Cloud Mirror Gen 2: before 5.06.115

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External links
https://support.wdc.com/downloads.aspx?g=907&lang=en#downloads
https://www.westerndigital.com/support/productsecurity/wdc-20009-os5-firmware-5-06-115
https://www.zerodayinitiative.com/advisories/ZDI-20-1447/

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Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the local network (LAN).

Is there known malware, which exploits this vulnerability?

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