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AmazonALAS-2023-1722

HistoryMar 30, 2023 - 10:50 p.m.

Important: exim

2023-03-3022:50:00

alas.aws.amazon.com

exim

starttls

response injection

buffer

cve-2021-38371

update

red hat

mitre

unix

CVSS2

Attack Vector

NETWORK

Attack Complexity

LOW

Authentication

NONE

Confidentiality Impact

NONE

Integrity Impact

PARTIAL

Availability Impact

NONE

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

CVSS3

7.5

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

NONE

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

NONE

Integrity Impact

HIGH

Availability Impact

NONE

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

EPSS

0.001

Percentile

50.0%

JSON

Issue Overview:

The STARTTLS feature in Exim through 4.94.2 allows response injection (buffering) during MTA SMTP sending. (CVE-2021-38371)

Affected Packages:

exim

Issue Correction:
Run yum update exim to update your system.

New Packages:

i686:  
    exim-debuginfo-4.92-1.36.amzn1.i686  
    exim-mysql-4.92-1.36.amzn1.i686  
    exim-mon-4.92-1.36.amzn1.i686  
    exim-greylist-4.92-1.36.amzn1.i686  
    exim-4.92-1.36.amzn1.i686  
    exim-pgsql-4.92-1.36.amzn1.i686  
  
src:  
    exim-4.92-1.36.amzn1.src  
  
x86_64:  
    exim-greylist-4.92-1.36.amzn1.x86_64  
    exim-mysql-4.92-1.36.amzn1.x86_64  
    exim-mon-4.92-1.36.amzn1.x86_64  
    exim-pgsql-4.92-1.36.amzn1.x86_64  
    exim-4.92-1.36.amzn1.x86_64  
    exim-debuginfo-4.92-1.36.amzn1.x86_64

Additional References

Red Hat: CVE-2021-38371

Mitre: CVE-2021-38371

OSVersionArchitecturePackageVersionFilename
Amazon Linux1i686exim-debuginfo< 4.92-1.36.amzn1exim-debuginfo-4.92-1.36.amzn1.i686.rpm
Amazon Linux1i686exim-mysql< 4.92-1.36.amzn1exim-mysql-4.92-1.36.amzn1.i686.rpm
Amazon Linux1i686exim-mon< 4.92-1.36.amzn1exim-mon-4.92-1.36.amzn1.i686.rpm
Amazon Linux1i686exim-greylist< 4.92-1.36.amzn1exim-greylist-4.92-1.36.amzn1.i686.rpm
Amazon Linux1i686exim< 4.92-1.36.amzn1exim-4.92-1.36.amzn1.i686.rpm
Amazon Linux1i686exim-pgsql< 4.92-1.36.amzn1exim-pgsql-4.92-1.36.amzn1.i686.rpm
Amazon Linux1x86_64exim-greylist< 4.92-1.36.amzn1exim-greylist-4.92-1.36.amzn1.x86_64.rpm
Amazon Linux1x86_64exim-mysql< 4.92-1.36.amzn1exim-mysql-4.92-1.36.amzn1.x86_64.rpm
Amazon Linux1x86_64exim-mon< 4.92-1.36.amzn1exim-mon-4.92-1.36.amzn1.x86_64.rpm
Amazon Linux1x86_64exim-pgsql< 4.92-1.36.amzn1exim-pgsql-4.92-1.36.amzn1.x86_64.rpm

OS	Version	Architecture	Package	Version	Filename
Amazon Linux	1	i686	exim-debuginfo	< 4.92-1.36.amzn1	exim-debuginfo-4.92-1.36.amzn1.i686.rpm
Amazon Linux	1	i686	exim-mysql	< 4.92-1.36.amzn1	exim-mysql-4.92-1.36.amzn1.i686.rpm
Amazon Linux	1	i686	exim-mon	< 4.92-1.36.amzn1	exim-mon-4.92-1.36.amzn1.i686.rpm
Amazon Linux	1	i686	exim-greylist	< 4.92-1.36.amzn1	exim-greylist-4.92-1.36.amzn1.i686.rpm
Amazon Linux	1	i686	exim	< 4.92-1.36.amzn1	exim-4.92-1.36.amzn1.i686.rpm
Amazon Linux	1	i686	exim-pgsql	< 4.92-1.36.amzn1	exim-pgsql-4.92-1.36.amzn1.i686.rpm
Amazon Linux	1	x86_64	exim-greylist	< 4.92-1.36.amzn1	exim-greylist-4.92-1.36.amzn1.x86_64.rpm
Amazon Linux	1	x86_64	exim-mysql	< 4.92-1.36.amzn1	exim-mysql-4.92-1.36.amzn1.x86_64.rpm
Amazon Linux	1	x86_64	exim-mon	< 4.92-1.36.amzn1	exim-mon-4.92-1.36.amzn1.x86_64.rpm
Amazon Linux	1	x86_64	exim-pgsql	< 4.92-1.36.amzn1	exim-pgsql-4.92-1.36.amzn1.x86_64.rpm