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CVE-2018-20340

Published: 8 February 2019

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.

Notes

AuthorNote
sbeattie
requires libpam-u2f setup or other yubikey based software
applications. Browser U2F implmentations are NOT affected.

Priority

Medium

Cvss 3 Severity Score

6.8

Score breakdown

Status

Package Release Status
libu2f-host
Launchpad, Ubuntu, Debian
jammy Not vulnerable
(1.1.7-1)
kinetic Not vulnerable
(1.1.7-1)
bionic
Released (1.1.4-1ubuntu0.1)
cosmic
Released (1.1.6-1ubuntu0.1)
disco Not vulnerable
(1.1.7-1)
eoan Not vulnerable
(1.1.7-1)
focal Not vulnerable
(1.1.7-1)
groovy Not vulnerable
(1.1.7-1)
hirsute Not vulnerable
(1.1.7-1)
impish Not vulnerable
(1.1.7-1)
lunar Not vulnerable
(1.1.7-1)
trusty Does not exist

upstream Pending
(1.1.7)
xenial Needed

mantic Not vulnerable
(1.1.7-1)
Patches:
upstream: https://github.com/Yubico/libu2f-host/commit/4d490bb2c528c351e32837fcdaebd998eb5d3f27
Binaries built from this source package are in Universe and so are supported by the community.

Severity score breakdown

Parameter Value
Base score 6.8
Attack vector Physical
Attack complexity Low
Privileges required None
User interaction None
Scope Unchanged
Confidentiality High
Integrity impact High
Availability impact High
Vector CVSS:3.0/AV:P/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H