Vulnerability Report

CVE-2018-20340

Title: Yubico Libu2F-Host Memory Corruption

Memory Corruption

Proof Of Concept

No public PoC currently indexed for CVE-2018-20340.

CWE Category CWE-119

Published Date Mar 21, 2019

Modified Date Nov 21, 2024

Exploit Status Not Found

Score 6.8 CVSS v3.0

Exploit Probability (EPSS)

0.50%

Vulnerability Summary

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.

Impacted Vendors

yubico 1

Reference Links

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/ 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/

CVSS v3.0

Source Entity [email protected]

Severity MEDIUM

6.8

Attack Vector

PHYSICAL

Complexity

LOW

Privileges

N/A

Interaction

NONE

Confidentiality

N/A

Integrity

N/A

Availability

N/A

Scope

UNCHANGED

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

CVSS v2.0

Source Entity [email protected]

Severity MEDIUM

4.6

Access Vector

N/A

Authentication

N/A

RAW VECTOR AV:L/AC:L/Au:N/C:P/I:P/A:P

Associated Attack Patterns (CAPEC)

Total: Patterns

CVE-2018-20340 Exploits & PoCs (Proof Of Concept)

No public PoCs found in our database for this CVE.

November 21, 2024 MODIFIED

Vulnerability data or affected products updated.

March 21, 2019 PUBLISHED

Vulnerability first announced in NVD.

Attack Vector Matrix

Access Vector PHYSICAL

Complexity LOW

Privileges N/A

Interaction NONE

CVSS Vector String


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

Affected Stack

No specific products linked.