CVE-2018-20340

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    CVE-2018-20340

    Published: 21 Mar 2019Last Modified: 15 Mar 2026

    Summary:

    Details: 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.debian.org/security/2019/dsa-4389, 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.yubico.com/support/security-advisories/ysa-2019-01/, https://blog.inhq.net/posts/yubico-libu2f-host-vuln-part1/

    Affected packages

    Package

    Name:

    Purl:

    Affected ranges

    Type: N/A

    Events:

    Introduced- None
    Fixed -None

    Affected versions

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High
    CVE-2018-20340 | CVE-DB