CVE-2020-28026

2021-05-0400:00:00

ubuntu.com

exim 4.94.2

line delimiters

delivery status notification

orcpt

spool header

remote attackers

arbitrary commands

unix

CVSS2

9.3

Attack Vector

NETWORK

Attack Complexity

MEDIUM

Authentication

NONE

Confidentiality Impact

COMPLETE

Integrity Impact

COMPLETE

Availability Impact

COMPLETE

AV:N/AC:M/Au:N/C:C/I:C/A:C

CVSS3

9.8

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

NONE

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

HIGH

Integrity Impact

HIGH

Availability Impact

HIGH

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

EPSS

0.009

Percentile

83.1%

JSON

Exim 4 before 4.94.2 has Improper Neutralization of Line Delimiters,
relevant in non-default configurations that enable Delivery Status
Notification (DSN). Certain uses of ORCPT= can place a newline into a spool
header file, and indirectly allow unauthenticated remote attackers to
execute arbitrary commands as root.

OSVersionArchitecturePackageVersionFilename
ubuntu18.04noarchexim4< 4.90.1-1ubuntu1.8UNKNOWN
ubuntu20.04noarchexim4< 4.93-13ubuntu1.5UNKNOWN
ubuntu20.10noarchexim4< 4.94-7ubuntu1.2UNKNOWN
ubuntu21.04noarchexim4< 4.94-15ubuntu1.2UNKNOWN
ubuntu21.10noarchexim4< 4.94-15ubuntu1.2UNKNOWN
ubuntu22.04noarchexim4< 4.94-15ubuntu1.2UNKNOWN
ubuntu14.04noarchexim4< 4.82-3ubuntu2.4+esm3UNKNOWN
ubuntu16.04noarchexim4< 4.86.2-2ubuntu2.6+esm1UNKNOWN

OS	Version	Architecture	Package	Version	Filename
ubuntu	18.04	noarch	exim4	< 4.90.1-1ubuntu1.8	UNKNOWN
ubuntu	20.04	noarch	exim4	< 4.93-13ubuntu1.5	UNKNOWN
ubuntu	20.10	noarch	exim4	< 4.94-7ubuntu1.2	UNKNOWN
ubuntu	21.04	noarch	exim4	< 4.94-15ubuntu1.2	UNKNOWN
ubuntu	21.10	noarch	exim4	< 4.94-15ubuntu1.2	UNKNOWN
ubuntu	22.04	noarch	exim4	< 4.94-15ubuntu1.2	UNKNOWN
ubuntu	14.04	noarch	exim4	< 4.82-3ubuntu2.4+esm3	UNKNOWN
ubuntu	16.04	noarch	exim4	< 4.86.2-2ubuntu2.6+esm1	UNKNOWN