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Debian DSA-4389-1 : libu2f-host - security update

medium Nessus Plugin ID 122102

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Synopsis

The remote Debian host is missing a security-related update.

Description

Christian Reitter discovered that libu2f-host, a library implementing the host-side of the U2F protocol, failed to properly check for a buffer overflow. This would allow an attacker with a custom made malicious USB device masquerading as a security key, and physical access to a computer where PAM U2F or an application with libu2f-host integrated, to potentially execute arbitrary code on that computer.

Solution

Upgrade the libu2f-host packages.

For the stable distribution (stretch), this problem has been fixed in version 1.1.2-2+deb9u1.

See Also

https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=921725

https://security-tracker.debian.org/tracker/source-package/libu2f-host

https://packages.debian.org/source/stretch/libu2f-host

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

Plugin Details

Severity: Medium

ID: 122102

File Name: debian_DSA-4389.nasl

Version: 1.3

Type: local

Agent: unix

Published: 2/12/2019

Updated: 2/13/2020

Supported Sensors: Frictionless Assessment Agent, Nessus Agent, Agentless Assessment, Nessus

Risk Information

VPR

Risk Factor: Medium

Score: 5.9

CVSS v2

Risk Factor: Medium

Base Score: 4.6

Temporal Score: 3.4

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

CVSS v3

Risk Factor: Medium

Base Score: 6.8

Temporal Score: 5.9

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

Temporal Vector: CVSS:3.0/E:U/RL:O/RC:C

Vulnerability Information

CPE: p-cpe:/a:debian:debian_linux:libu2f-host, cpe:/o:debian:debian_linux:9.0

Required KB Items: Host/local_checks_enabled, Host/Debian/release, Host/Debian/dpkg-l

Exploit Ease: No known exploits are available

Patch Publication Date: 2/11/2019

Vulnerability Publication Date: 3/21/2019

Reference Information

CVE: CVE-2018-20340

DSA: 4389