UBUNTU-CVE-2018-12556

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    UBUNTU-CVE-2018-12556

    Published: 16 May 2019Last Modified: 20 May 2026
    Upstream:
    CVE-2018-12556

    Summary:

    Details: The signature verification routine in install.sh in yarnpkg/website through 2018-06-05 only verifies that the yarn release is signed by any (arbitrary) key in the local keyring of the user, and does not pin the signature to the yarn release key, which allows remote attackers to sign tampered yarn release packages with their own key.

    References: https://ubuntu.com/security/CVE-2018-12556, http://packetstormsecurity.com/files/152703/Johnny-You-Are-Fired.html, http://seclists.org/fulldisclosure/2019/Apr/38, https://github.com/RUB-NDS/Johnny-You-Are-Fired, https://github.com/RUB-NDS/Johnny-You-Are-Fired/blob/master/paper/johnny-fired.pdf, https://github.com/yarnpkg/website/commits/master, https://www.openwall.com/lists/oss-security/2019/04/30/4, https://neopg.io/blog/yarn-signature-bypass/, https://www.cve.org/CVERecord?id=CVE-2018-12556

    Affected packages

    Package

    Name: node-yarnpkg

    Purl: pkg:deb/ubuntu/node-yarnpkg?arch=source&distro=focal

    Affected ranges

    Type: ECOSYSTEM

    Events:

    Introduced- 0
    Fixed -None

    Affected versions

    1.13.0-1build1
    1.13.0-3

    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
    UBUNTU-CVE-2018-12556 | CVE-DB