CVE-2020-28896

2020-11-2300:00:00

ubuntu.com

mutt

neomutt

tls

imap

authentication

credentials

encrypted connection

man-in-the-middle

CVSS2

2.6

Attack Vector

NETWORK

Attack Complexity

HIGH

Authentication

NONE

Confidentiality Impact

PARTIAL

Integrity Impact

NONE

Availability Impact

NONE

AV:N/AC:H/Au:N/C:P/I:N/A:N

CVSS3

5.3

Attack Vector

NETWORK

Attack Complexity

HIGH

Privileges Required

NONE

User Interaction

REQUIRED

Scope

UNCHANGED

Confidentiality Impact

HIGH

Integrity Impact

NONE

Availability Impact

NONE

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

EPSS

0.003

Percentile

69.9%

JSON

Mutt before 2.0.2 and NeoMutt before 2020-11-20 did not ensure that
$ssl_force_tls was processed if an IMAP server’s initial server response
was invalid. The connection was not properly closed, and the code could
continue attempting to authenticate. This could result in authentication
credentials being exposed on an unencrypted connection, or to a
machine-in-the-middle.

OSVersionArchitecturePackageVersionFilename
ubuntu18.04noarchmutt< 1.9.4-3ubuntu0.4UNKNOWN
ubuntu20.04noarchmutt< 1.13.2-1ubuntu0.3UNKNOWN
ubuntu20.10noarchmutt< 1.14.6-1ubuntu0.1UNKNOWN
ubuntu16.04noarchmutt< 1.5.24-1ubuntu0.5UNKNOWN
ubuntu18.04noarchneomutt< anyUNKNOWN
ubuntu20.04noarchneomutt< anyUNKNOWN

OS	Version	Architecture	Package	Version	Filename
ubuntu	18.04	noarch	mutt	< 1.9.4-3ubuntu0.4	UNKNOWN
ubuntu	20.04	noarch	mutt	< 1.13.2-1ubuntu0.3	UNKNOWN
ubuntu	20.10	noarch	mutt	< 1.14.6-1ubuntu0.1	UNKNOWN
ubuntu	16.04	noarch	mutt	< 1.5.24-1ubuntu0.5	UNKNOWN
ubuntu	18.04	noarch	neomutt	< any	UNKNOWN
ubuntu	20.04	noarch	neomutt	< any	UNKNOWN