CVE-2018-18509

thunderbird: flaw in verification of S/MIME signature resulting in signature spoofing

Severity Score

5.3

*CVSS v3

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

*Multiple Sources

Exploited in Wild

*KEV

Decision

*SSVC

Descriptions

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.

Un fallo durante la comprobación de ciertas firmas S/MIME produce correos electrónicos que se mostrarán en Thunderbird con una firma digital válida, incluso si el contenido del mensaje mostrado no está cubierto por la firma. El fallo le permite a un atacante reutilizar una firma S/MIME válida para poder elaborar un mensaje de correo electrónico con contenido arbitrario. Esta vulnerabilidad afecta a Thunderbird versiones <60.5.1.

A use-after-free was discovered in libical. If a user were tricked in to opening a specially crafted ICS calendar file, an attacker could potentially exploit this to cause a denial of service. Multiple security issues were discovered in Thunderbird. If a user were tricked in to opening a specially crafted message, an attacker could potentially exploit these to cause a denial of service, or execute arbitrary code. Various other issues were also addressed.

*Credits: N/A

CVSS Scores

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

Low

Availability

None

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

Low

Integrity

None

Availability

None

Attack Vector

Network

Attack Complexity

Low

Authentication

None

Confidentiality

None

Integrity

Partial

Availability

None

* Common Vulnerability Scoring System

SSVC

Decision:-

Exploitation

Automatable

Tech. Impact

* Organization's Worst-case Scenario

Timeline

2018-10-19 CVE Reserved
2019-02-18 CVE Published
2019-05-01 First Exploit
2024-08-05 CVE Updated
2025-03-30 EPSS Updated
---------- Exploited in Wild
---------- KEV Due Date

CWE

CWE-347: Improper Verification of Cryptographic Signature

CAPEC

References (11)

URL	Tag	Source
http://packetstormsecurity.com/files/152703/Johnny-You-Are-Fired.html	Third Party Advisory
http://seclists.org/fulldisclosure/2019/Apr/38	Mailing List
http://www.openwall.com/lists/oss-security/2019/04/30/4	Mailing List
https://github.com/RUB-NDS/Johnny-You-Are-Fired	X_refsource_misc
https://github.com/RUB-NDS/Johnny-You-Are-Fired/blob/master/paper/johnny-fired.pdf	X_refsource_misc

URL	Date	SRC
https://packetstorm.news/files/id/152703	2019-05-01

URL	Date	SRC

URL	Date	SRC
http://lists.opensuse.org/opensuse-security-announce/2019-04/msg00043.html	2019-06-03
https://access.redhat.com/errata/RHSA-2019:1144	2019-06-03
https://www.mozilla.org/security/advisories/mfsa2019-06	2019-06-03
https://access.redhat.com/security/cve/CVE-2018-18509	2019-05-13
https://bugzilla.redhat.com/show_bug.cgi?id=1677613	2019-05-13

Affected Vendors, Products, and Versions

Vendor		Product				Version		Other		Status
Vendor	Product	Version	Other	Status	<-- -->	Vendor	Product	Version	Other	Status
Mozilla Search vendor "Mozilla"		Thunderbird Search vendor "Mozilla" for product "Thunderbird"				< 60.5.1 Search vendor "Mozilla" for product "Thunderbird" and version " < 60.5.1"		-		Affected