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CVE-2018-18509 Details

Description

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.

Metrics

CVSS 3.x Severity and Vector Strings:

NIST: [email protected]CVSS-B:5.3 MEDIUMVector:CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N

References to Advisories, Solutions, and Tools

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URL	Source(s)	Tag(s)
http://lists.opensuse.org/opensuse-security-announce/2019-04/msg00043.html	CVE
http://packetstormsecurity.com/files/152703/Johnny-You-Are-Fired.html	CVE	Third Party AdvisoryVDB Entry
https://access.redhat.com/errata/RHSA-2019:1144	CVE
https://bugzilla.mozilla.org/show_bug.cgi?id=1507218	CVE	Issue TrackingPermissions RequiredVendor Advisory
http://seclists.org/fulldisclosure/2019/Apr/38	CVE	Mailing ListThird Party Advisory
https://github.com/RUB-NDS/Johnny-You-Are-Fired	CVE
https://github.com/RUB-NDS/Johnny-You-Are-Fired/blob/master/paper/johnny-fired.pdf	CVE
https://www.mozilla.org/security/advisories/mfsa2019-06/	CVE	Vendor Advisory
http://www.openwall.com/lists/oss-security/2019/04/30/4	CVE	Mailing ListThird Party Advisory
http://lists.opensuse.org/opensuse-security-announce/2019-04/msg00043.html	[email protected]
http://packetstormsecurity.com/files/152703/Johnny-You-Are-Fired.html	[email protected]	Third Party AdvisoryVDB Entry
https://access.redhat.com/errata/RHSA-2019:1144	[email protected]
https://bugzilla.mozilla.org/show_bug.cgi?id=1507218	[email protected]	Issue TrackingPermissions RequiredVendor Advisory
http://seclists.org/fulldisclosure/2019/Apr/38	[email protected]	Mailing ListThird Party Advisory
https://github.com/RUB-NDS/Johnny-You-Are-Fired	[email protected]
https://github.com/RUB-NDS/Johnny-You-Are-Fired/blob/master/paper/johnny-fired.pdf	[email protected]
https://www.mozilla.org/security/advisories/mfsa2019-06/	[email protected]	Vendor Advisory
http://www.openwall.com/lists/oss-security/2019/04/30/4	[email protected]	Mailing ListThird Party Advisory

see all 18 references

Weakness Enumeration

CWE-ID	CWE Name	Source
CWE-347	Improper Verification of Cryptographic Signature	[email protected]

Affected Products

Product	Versions
mozilla thunderbird	< 60.5.1
CPE cpe:2.3:a:mozilla:thunderbird:::::::: Remediation No remediation found in references.

Change History

10 change records found show changes

Date	Action	Recorded By
Jun 17, 2026	CVE Modified	[email protected]
Nov 21, 2024	CVE Modified	CVE
May 14, 2024	CVE Modified	[email protected]
Jun 3, 2019	CVE Modified	[email protected]
May 28, 2019	CVE Modified	[email protected]
May 10, 2019	Modified Analysis	[email protected]
May 2, 2019	CVE Modified	[email protected]
Apr 30, 2019	CVE Modified	[email protected]
Apr 30, 2019	Initial Analysis	[email protected]
Apr 30, 2019	CVE Modified	[email protected]