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amazonAmazonALAS-2017-932
HistoryDec 20, 2017 - 6:51 p.m.

Critical: exim

2017-12-2018:51:00
alas.aws.amazon.com
21

CVSS2

7.5

Attack Vector

NETWORK

Attack Complexity

LOW

Authentication

NONE

Confidentiality Impact

PARTIAL

Integrity Impact

PARTIAL

Availability Impact

PARTIAL

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

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

EPSS

0.851

Percentile

98.5%

Issue Overview:

Use-after-free in receive_msg function via vectors involving BDAT commands
The receive_msg function in receive.c in the SMTP daemon in Exim 4.88 and 4.89 allows remote attackers to execute arbitrary code or cause a denial of service (use-after-free) via vectors involving BDAT commands. (CVE-2017-16943)

Infinite loop and stack exhaustion in receive_msg function via vectors involving BDAT commands
The receive_msg function in receive.c in the SMTP daemon in Exim 4.88 and 4.89 allows remote attackers to cause a denial of service (infinite loop and stack exhaustion) via vectors involving BDAT commands and an improper check for a ‘.’ character signifying the end of the content, related to the bdat_getc function. (CVE-2017-16944)

Affected Packages:

exim

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

New Packages:

i686:  
    exim-mysql-4.89-4.17.amzn1.i686  
    exim-greylist-4.89-4.17.amzn1.i686  
    exim-debuginfo-4.89-4.17.amzn1.i686  
    exim-pgsql-4.89-4.17.amzn1.i686  
    exim-mon-4.89-4.17.amzn1.i686  
    exim-4.89-4.17.amzn1.i686  
  
src:  
    exim-4.89-4.17.amzn1.src  
  
x86_64:  
    exim-debuginfo-4.89-4.17.amzn1.x86_64  
    exim-4.89-4.17.amzn1.x86_64  
    exim-greylist-4.89-4.17.amzn1.x86_64  
    exim-mysql-4.89-4.17.amzn1.x86_64  
    exim-pgsql-4.89-4.17.amzn1.x86_64  
    exim-mon-4.89-4.17.amzn1.x86_64  

Additional References

Red Hat: CVE-2017-16943, CVE-2017-16944

Mitre: CVE-2017-16943, CVE-2017-16944

CVSS2

7.5

Attack Vector

NETWORK

Attack Complexity

LOW

Authentication

NONE

Confidentiality Impact

PARTIAL

Integrity Impact

PARTIAL

Availability Impact

PARTIAL

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

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

EPSS

0.851

Percentile

98.5%