Amazon Linux AMI : exim (ALAS-2021-1497)

critical Nessus Plugin ID 149430

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Synopsis

The remote Amazon Linux AMI host is missing a security update.

Description

The version of exim installed on the remote host is prior to 4.92-1.27. It is, therefore, affected by multiple vulnerabilities as referenced in the ALAS-2021-1497 advisory.

Prior versions of Exim 4 have Improper Neutralization of Line Delimiters. Local users can alter the behavior of root processes because a recipient address can have a newline character. (CVE-2020-28015)

Prior versions of Exim 4 allowed Integer Overflow to Buffer Overflow in receive_add_recipient via an e-mail message with fifty million recipients. NOTE: remote exploitation may be difficult because of resource consumption. (CVE-2020-28017)

Prior versions of Exim 4 allowed Use After Free in smtp_reset in certain situations that may be common for builds with OpenSSL. (CVE-2020-28018)

Prior versions of Exim 4 have Improper Neutralization of Line Delimiters. An authenticated remote SMTP client can insert newline characters into a spool file (which indirectly leads to remote code execution as root) via AUTH= in a MAIL FROM command. (CVE-2020-28021)

Tenable has extracted the preceding description block directly from the tested product security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

Solution

Run 'yum update exim' to update your system.

Plugin Details

Severity: Critical

ID: 149430

File Name: ala_ALAS-2021-1497.nasl

Version: 1.5

Type: local

Agent: unix

Family: Amazon Linux Local Security Checks

Published: 5/12/2021

Updated: 12/11/2024

Supported Sensors: Agentless Assessment, Continuous Assessment, Frictionless Assessment Agent, Frictionless Assessment AWS, Nessus Agent, Nessus

Risk Information

VPR

Risk Factor: Medium

Score: 6.7

CVSS v2

Risk Factor: High

Base Score: 9

Temporal Score: 7

Vector: CVSS2#AV:N/AC:L/Au:S/C:C/I:C/A:C

CVSS Score Source: CVE-2020-28021

CVSS v3

Risk Factor: Critical

Base Score: 9.8

Temporal Score: 8.8

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

Temporal Vector: CVSS:3.0/E:P/RL:O/RC:C

CVSS Score Source: CVE-2020-28018

Vulnerability Information

CPE: p-cpe:/a:amazon:linux:exim, p-cpe:/a:amazon:linux:exim-debuginfo, p-cpe:/a:amazon:linux:exim-pgsql, p-cpe:/a:amazon:linux:exim-mon, p-cpe:/a:amazon:linux:exim-greylist, cpe:/o:amazon:linux, p-cpe:/a:amazon:linux:exim-mysql

Required KB Items: Host/local_checks_enabled, Host/AmazonLinux/release, Host/AmazonLinux/rpm-list

Exploit Available: true

Exploit Ease: Exploits are available

Patch Publication Date: 5/6/2021

Vulnerability Publication Date: 5/6/2021

Reference Information

CVE: CVE-2020-28015, CVE-2020-28017, CVE-2020-28018, CVE-2020-28021

ALAS: 2021-1497

Detections

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