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.

CVSS v3.0 5.3 MEDIUM
CVSS v2.0 5.0 MEDIUM

5.3^/10

CVSS v3.0 : MEDIUM

Vector : AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N

Exploitability : 3.9 / Impact : 1.4

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required NONE

User Interaction NONE

Confidentiality Impact NONE

Integrity Impact LOW

Availability Impact NONE

Scope UNCHANGED

5.0^/10

CVSS v2.0 : MEDIUM

Vector : AV:N/AC:L/Au:N/C:N/I:P/A:N

Exploitability : 10.0 / Impact : 2.9

Access Vector NETWORK

Access Complexity LOW

Authentication NONE

Confidentiality Impact NONE

Integrity Impact PARTIAL

Availability Impact NONE

References

Link	Resource
https://www.mozilla.org/security/advisories/mfsa2019-06/	Vendor Advisory
https://bugzilla.mozilla.org/show_bug.cgi?id=1507218	Issue Tracking Permissions Required Vendor Advisory
http://www.openwall.com/lists/oss-security/2019/04/30/4	Mailing List Third Party Advisory
http://seclists.org/fulldisclosure/2019/Apr/38	Mailing List Third Party Advisory
http://packetstormsecurity.com/files/152703/Johnny-You-Are-Fired.html	Third Party Advisory VDB Entry
https://github.com/RUB-NDS/Johnny-You-Are-Fired/blob/master/paper/johnny-fired.pdf
https://github.com/RUB-NDS/Johnny-You-Are-Fired
http://lists.opensuse.org/opensuse-security-announce/2019-04/msg00043.html
https://access.redhat.com/errata/RHSA-2019:1144

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Configurations

Configuration 1 (hide)

cpe:2.3:a:mozilla:thunderbird:*:*:*:*:*:*:*:*

Information

Published : 2019-04-26 10:29

Updated : 2019-06-03 12:29

NVD link : CVE-2018-18509

Mitre link : CVE-2018-18509

JSON object : View

CWE

CWE-347

Improper Verification of Cryptographic Signature

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Products Affected

mozilla

thunderbird

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