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Debian DSA-4611-1 : opensmtpd - security update

critical Nessus Plugin ID 133326

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Synopsis

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

Description

Qualys discovered that the OpenSMTPD SMTP server performed insufficient validation of email addresses which could result in the execution of arbitrary commands as root. In addition this update fixes a denial of service by triggering an opportunistic TLS downgrade.

Solution

Upgrade the opensmtpd packages.

For the oldstable distribution (stretch), these problems have been fixed in version 6.0.2p1-2+deb9u2.

For the stable distribution (buster), these problems have been fixed in version 6.0.3p1-5+deb10u3. This update also includes non-security bugfixes which were already lined up for the Buster 10.3 point release.

See Also

https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=950121

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

https://www.debian.org/security/2020/dsa-4611

Plugin Details

Severity: Critical

ID: 133326

File Name: debian_DSA-4611.nasl

Version: 1.9

Type: local

Agent: unix

Published: 1/30/2020

Updated: 1/12/2023

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

Risk Information

VPR

Risk Factor: High

Score: 8.4

CVSS v2

Risk Factor: Critical

Base Score: 10

Temporal Score: 8.7

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

CVSS Score Source: CVE-2020-7247

CVSS v3

Risk Factor: Critical

Base Score: 9.8

Temporal Score: 9.4

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:H/RL:O/RC:C

Vulnerability Information

CPE: cpe:/o:debian:debian_linux:10.0, cpe:/o:debian:debian_linux:9.0, p-cpe:/a:debian:debian_linux:opensmtpd

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

Exploit Available: true

Exploit Ease: Exploits are available

Patch Publication Date: 1/29/2020

Vulnerability Publication Date: 1/29/2020

CISA Known Exploited Vulnerability Due Dates: 4/15/2022

Exploitable With

Core Impact

Metasploit (OpenSMTPD MAIL FROM Remote Code Execution)

Reference Information

CVE: CVE-2020-7247

DSA: 4611