CVE-2018-20340 Information

Description

Yubico libu2f-host 1.1.6 contains unchecked buffers in devs.c which could enable a malicious token to exploit a buffer overflow. An attacker could use this to attempt to execute malicious code using a crafted USB device masquerading as a security token on a computer where the affected library is currently in use. It is not possible to perform this attack with a genuine YubiKey.

CVSS Vector

CVSS:3.0/AV:P/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Reference

https://blog.inhq.net/posts/yubico-libu2f-host-vuln-part1/ https://developers.yubico.com/libu2f-host/Release_Notes.html https://seclists.org/bugtraq/2019/Feb/23 https://security.gentoo.org/glsa/202004-15 https://www.debian.org/security/2019/dsa-4389 https://www.yubico.com/support/security-advisories/ysa-2019-01/

Attack Complexity

LOW

Privileges Required

NONE

User Interaction Required

NONE

Scope

NONE

Confidentiality Impact

UNCHANGED

Integrity Impact

HIGH

Availability Impact

HIGH

Base Score

HIGH

Base Severity

6.8