CVE-2018-20340

medium

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.

References

https://www.yubico.com/support/security-advisories/ysa-2019-01/

https://www.debian.org/security/2019/dsa-4389

https://security.gentoo.org/glsa/202004-15

https://seclists.org/bugtraq/2019/Feb/23

https://developers.yubico.com/libu2f-host/Release_Notes.html

https://blog.inhq.net/posts/yubico-libu2f-host-vuln-part1/

Details

Source: Mitre, NVD

Published: 2019-03-21

Updated: 2019-12-05

Risk Information

CVSS v2

Base Score: 4.6

Vector: CVSS2#AV:L/AC:L/Au:N/C:P/I:P/A:P

Severity: Medium

CVSS v3

Base Score: 6.8

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

Severity: Medium