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Debian DSA-4385-1 : dovecot - security update

medium Nessus Plugin ID 121603

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Synopsis

The remote Debian host is missing a security-related update.

Description

halfdog discovered an authentication bypass vulnerability in the Dovecot email server. Under some configurations Dovecot mistakenly trusts the username provided via authentication instead of failing. If there is no additional password verification, this allows the attacker to login as anyone else in the system. Only installations using :

 - auth_ssl_require_client_cert = yes
 - auth_ssl_username_from_cert = yes

are affected by this flaw.

Solution

Upgrade the dovecot packages.

For the stable distribution (stretch), this problem has been fixed in version 1:2.2.27-3+deb9u3.

See Also

https://security-tracker.debian.org/tracker/source-package/dovecot

https://packages.debian.org/source/stretch/dovecot

https://www.debian.org/security/2019/dsa-4385

Plugin Details

Severity: Medium

ID: 121603

File Name: debian_DSA-4385.nasl

Version: 1.3

Type: local

Agent: unix

Published: 2/6/2019

Updated: 2/20/2020

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

Risk Information

VPR

Risk Factor: Medium

Score: 6.0

CVSS v2

Risk Factor: Medium

Base Score: 4.9

Temporal Score: 3.6

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

CVSS v3

Risk Factor: Medium

Base Score: 6.8

Temporal Score: 5.9

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

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

Vulnerability Information

CPE: p-cpe:/a:debian:debian_linux:dovecot, cpe:/o:debian:debian_linux:9.0

Required KB Items: Host/local_checks_enabled, Host/Debian/release, Host/Debian/dpkg-l

Exploit Ease: No known exploits are available

Patch Publication Date: 2/5/2019

Vulnerability Publication Date: 3/27/2019

Reference Information

CVE: CVE-2019-3814

DSA: 4385