CVE-2019-11755 Information

Description

A crafted S/MIME message consisting of an inner encryption layer and an outer SignedData layer was shown as having a valid digital signature although the signer might have had no access to the contents of the encrypted message and might have stripped a different signature from the encrypted message. Previous versions had only suppressed showing a digital signature for messages with an outer multipart/signed layer. This vulnerability affects Thunderbird 68.1.1.

CVSS Vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

Reference

http://lists.opensuse.org/opensuse-security-announce/2019-10/msg00009.html http://lists.opensuse.org/opensuse-security-announce/2019-10/msg00010.html https://bugzilla.mozilla.org/show_bug.cgi?id=1240290 https://lists.debian.org/debian-lts-announce/2019/11/msg00017.html https://seclists.org/bugtraq/2019/Nov/24 https://usn.ubuntu.com/4202-1/ https://usn.ubuntu.com/4335-1/ https://www.debian.org/security/2019/dsa-4571 https://www.mozilla.org/security/advisories/mfsa2019-32/

Attack Complexity

LOW

Privileges Required

NONE

User Interaction Required

NONE

Scope

NONE

Confidentiality Impact

UNCHANGED

Integrity Impact

NONE

Availability Impact

HIGH

Base Score

NONE

Base Severity

7.5