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    CVE-2018-18509

    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.

    Published:Feb 14, 2019
    Last Modified:Nov 21, 2024
    EPS:Apr 26, 2019
    EPSS Score:0.0028
    CVSS Score:5.3

    Affected Products

    Vendor
    Mozilla
    Product
    Thunderbird
    Vendor
    Redhat
    Product
    Enterprise Linux

    Exploits

    No exploit reference

    Related CVEs

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    CVE-2026-84640 (CVSS 7.5) — A maliciously constructed mail header could lead to a one byte read past the end of a buffer. This vulnerabili…
    CVE-2026-84639 (CVSS 9.1) — Triggering an error condition in certain MIME bodies would cause uninitialized memory to be used. This vulnera…
    CVE-2026-84637 (CVSS 9.8) — Malicious calendar invitations could use file URI attachments to launch local or network-hosted executables on…
    CVE-2026-84144 (CVSS 7.5) — Internally found bugs present in Thunderbird 154 and Thunderbird ESR 153.1. Some of these bugs showed evidence…
    CVE-2026-84143 (CVSS 9.8) — Internally found bugs present in Thunderbird 154, Thunderbird ESR 153.1 and Thunderbird ESR 140.14. Some of th…
    CVE-2026-84142 (CVSS 9.8) — Internally found bugs present in Thunderbird 154. Some of these bugs showed evidence of memory corruption or a…
    CVE-2026-84141 (CVSS 9.8) — Integer overflow in the Graphics: ImageLib component. This vulnerability was fixed in Firefox 155, Firefox ESR…
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    References

    http://lists.opensuse.org/opensuse-security-announce/2019-04/msg00043.html
    http://packetstormsecurity.com/files/152703/Johnny-You-Are-Fired.html
    http://seclists.org/fulldisclosure/2019/Apr/38
    http://www.openwall.com/lists/oss-security/2019/04/30/4
    https://access.redhat.com/errata/RHSA-2019:1144
    https://bugzilla.mozilla.org/show_bug.cgi?id=1507218
    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://www.mozilla.org/security/advisories/mfsa2019-06/
    http://lists.opensuse.org/opensuse-security-announce/2019-04/msg00043.html
    http://packetstormsecurity.com/files/152703/Johnny-You-Are-Fired.html
    http://seclists.org/fulldisclosure/2019/Apr/38
    http://www.openwall.com/lists/oss-security/2019/04/30/4
    https://access.redhat.com/errata/RHSA-2019:1144
    https://bugzilla.mozilla.org/show_bug.cgi?id=1507218
    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://www.mozilla.org/security/advisories/mfsa2019-06/

    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