CVE-2018-20340

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 v3.0 6.8 MEDIUM
CVSS v2.0 4.6 MEDIUM

6.8^/10

CVSS v3.0 : MEDIUM

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

Exploitability : 0.9 / Impact : 5.9

Attack Vector PHYSICAL

Attack Complexity LOW

Privileges Required NONE

User Interaction NONE

Confidentiality Impact HIGH

Integrity Impact HIGH

Availability Impact HIGH

Scope UNCHANGED

4.6^/10

CVSS v2.0 : MEDIUM

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

Exploitability : 3.9 / Impact : 6.4

Access Vector LOCAL

Access Complexity LOW

Authentication NONE

Confidentiality Impact PARTIAL

Integrity Impact PARTIAL

Availability Impact PARTIAL

References

Link	Resource
https://www.yubico.com/support/security-advisories/ysa-2019-01/	Patch Vendor Advisory
https://www.debian.org/security/2019/dsa-4389	Third Party Advisory
https://seclists.org/bugtraq/2019/Feb/23	Mailing List Third Party Advisory
https://developers.yubico.com/libu2f-host/Release_Notes.html	Release Notes Vendor Advisory
https://blog.inhq.net/posts/yubico-libu2f-host-vuln-part1/
https://security.gentoo.org/glsa/202004-15

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Configurations

Configuration 1 (hide)

cpe:2.3:a:yubico:libu2f-host:1.1.6:*:*:*:*:*:*:*

Configuration 2 (hide)

cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:*

Information

Published : 2019-03-21 09:00

Updated : 2019-12-05 09:15

NVD link : CVE-2018-20340

Mitre link : CVE-2018-20340

JSON object : View

CWE

CWE-119

Improper Restriction of Operations within the Bounds of a Memory Buffer

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Products Affected

debian

debian_linux

yubico

libu2f-host

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