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Amazon Linux AMI : dovecot (ALAS-2020-1435)
high Nessus Plugin ID 141982
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Synopsis
The remote Amazon Linux AMI host is missing a security update.Description
The version of dovecot installed on the remote host is prior to 2.2.36-6.21. It is, therefore, affected by multiple vulnerabilities as referenced in the ALAS-2020-1435 advisory.A flaw was found in dovecot. A remote attacker could cause a denial of service by repeatedly sending emails containing MIME parts containing malicious content of which dovecot will attempt to parse. The highest threat from this vulnerability is to system availability. In Dovecot before 2.3.11.3, uncontrolled recursion in submission, lmtp, and lda allows remote attackers to cause a denial of service (resource consumption) via a crafted e-mail message with deeply nested MIME parts. (CVE-2020-12100)
In Dovecot before 2.3.11.3, sending a specially formatted NTLM request will crash the auth service because of an out-of-bounds read. A flaw was found in dovecot. An out-of-bounds read flaw was found in the way dovecot handled NTLM authentication allowing an attacker to crash the dovecot auth process repeatedly preventing login. The highest threat from this vulnerability is to system availability. (CVE-2020-12673)
In Dovecot before 2.3.11.3, sending a specially formatted RPA request will crash the auth service because a length of zero is mishandled. A flaw was found in dovecot. An attacker can use the way dovecot handles RPA (Remote Passphrase Authentication) to crash the authentication process repeatedly preventing login.
The highest threat from this vulnerability is to system availability. (CVE-2020-12674)
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 dovecot' to update your system.See Also
https://alas.aws.amazon.com/ALAS-2020-1435.html
https://access.redhat.com/security/cve/CVE-2020-12100
Plugin Details
Severity: High
ID: 141982
File Name: ala_ALAS-2020-1435.nasl
Version: 1.5
Type: local
Agent: unix
Published: 10/28/2020
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: 4.4
CVSS v2
Risk Factor: Medium
Base Score: 5
Temporal Score: 3.9
Vector: CVSS2#AV:N/AC:L/Au:N/C:N/I:N/A:P
CVSS Score Source: CVE-2020-12674
CVSS v3
Risk Factor: High
Base Score: 7.5
Temporal Score: 6.7
Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Temporal Vector: CVSS:3.0/E:P/RL:O/RC:C
Vulnerability Information
CPE: p-cpe:/a:amazon:linux:dovecot, p-cpe:/a:amazon:linux:dovecot-pigeonhole, p-cpe:/a:amazon:linux:dovecot-devel, p-cpe:/a:amazon:linux:dovecot-debuginfo, p-cpe:/a:amazon:linux:dovecot-pgsql, p-cpe:/a:amazon:linux:dovecot-mysql, cpe:/o:amazon:linux
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: 10/26/2020
Vulnerability Publication Date: 8/12/2020
Reference Information
CVE: CVE-2020-12100, CVE-2020-12673, CVE-2020-12674
ALAS: 2020-1435