UBUNTU-CVE-2018-18509

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    UBUNTU-CVE-2018-18509

    Published: 31 Dec 2018Last Modified: 22 Apr 2026
    Upstream:
    CVE-2018-18509
    Aliases:
    USN-3897-1

    Summary:

    Details: A flaw during verification of certain S/MIME signatures causes emails to be shown in Thunderbird as having a valid digital signature, even if the shown message contents aren't covered by the signature. The flaw allows an attacker to reuse a valid S/MIME signature to craft an email message with arbitrary content. This vulnerability affects Thunderbird < 60.5.1.

    References: https://ubuntu.com/security/CVE-2018-18509, https://www.mozilla.org/en-US/security/advisories/mfsa2019-06/#CVE-2018-18511, https://ubuntu.com/security/notices/USN-3897-1, https://www.cve.org/CVERecord?id=CVE-2018-18509

    Affected packages

    Package

    Name: thunderbird

    Purl: pkg:deb/ubuntu/thunderbird@1:60.5.1+build2-0ubuntu0.14.04.1?arch=source&distro=trusty

    Affected ranges

    Type: ECOSYSTEM

    Events:

    Introduced- 0
    Fixed -1:60.5.1+build2-0ubuntu0.14.04.1

    Affected versions

    1:24.0+build1-0ubuntu1

    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