Information disclosure in WindowsHello library

1) Inadequate Encryption Strength

EUVDB-ID: #VU27046

Risk: Low

CVSSv4.0: 2.1 [CVSS:4.0/AV:L/AC:L/AT:P/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2020-11005

CWE-ID: CWE-326 - Inadequate Encryption Strength

Exploit availability: No

Description

The vulnerability allows a local attacker to gain access to sensitve information on the target system.

The vulnerability exists due to weak hashing algorithm and insecure permissions. If the library is used to encrypt text and write the output to a txt file, a local attacker can use another executable to decrypt the text using the static method "NCryptDecrypt" from this same library without the need to use Windows Hello Authentication again.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

WindowsHello: All versions

CPE2.3

• cpe:2.3:a:sepppenner:windowshello:*:*:*:*:*:*:*:*

External links

https://github.com/SeppPenner/WindowsHello/issues/3
https://github.com/SeppPenner/WindowsHello/security/advisories/GHSA-wvpv-ffcv-r6cw

Q & A

Can this vulnerability be exploited remotely?

No. This vulnerability can be exploited locally. The attacker should have authentication credentials and successfully authenticate on the system.

Is there known malware, which exploits this vulnerability?

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