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Ubuntu 16.04 ESM : OpenSMTPD vulnerabilities (USN-4875-1)

critical Nessus Plugin ID 183572

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Synopsis

The remote Ubuntu host is missing one or more security updates.

Description

The remote Ubuntu 16.04 ESM host has a package installed that is affected by multiple vulnerabilities as referenced in the USN-4875-1 advisory.

 - smtp_mailaddr in smtp_session.c in OpenSMTPD 6.6, as used in OpenBSD 6.6 and other products, allows remote attackers to execute arbitrary commands as root via a crafted SMTP session, as demonstrated by shell metacharacters in a MAIL FROM field. This affects the uncommented default configuration. The issue exists because of an incorrect return value upon failure of input validation. (CVE-2020-7247)

 - OpenSMTPD before 6.6.4 allows local users to read arbitrary files (e.g., on some Linux distributions) because of a combination of an untrusted search path in makemap.c and race conditions in the offline functionality in smtpd.c. (CVE-2020-8793)

 - OpenSMTPD before 6.6.4 allows remote code execution because of an out-of-bounds read in mta_io in mta_session.c for multi-line replies. Although this vulnerability affects the client side of OpenSMTPD, it is possible to attack a server because the server code launches the client code during bounce handling.
 (CVE-2020-8794)

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

Solution

Update the affected opensmtpd package.

See Also

https://ubuntu.com/security/notices/USN-4875-1

Plugin Details

Severity: Critical

ID: 183572

File Name: ubuntu_USN-4875-1.nasl

Version: 1.1

Type: local

Agent: unix

Published: 10/20/2023

Updated: 10/23/2023

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

Risk Information

VPR

Risk Factor: High

Score: 8.4

CVSS v2

Risk Factor: Critical

Base Score: 10

Temporal Score: 8.3

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

CVSS Score Source: CVE-2020-8794

CVSS v3

Risk Factor: Critical

Base Score: 9.8

Temporal Score: 9.1

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:F/RL:O/RC:C

Vulnerability Information

CPE: cpe:/o:canonical:ubuntu_linux:16.04:-:esm, p-cpe:/a:canonical:ubuntu_linux:opensmtpd

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

Exploit Available: true

Exploit Ease: Exploits are available

Patch Publication Date: 3/15/2021

Vulnerability Publication Date: 1/29/2020

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

Exploitable With

Core Impact

Metasploit (OpenSMTPD OOB Read Local Privilege Escalation)

Reference Information

CVE: CVE-2020-7247, CVE-2020-8793, CVE-2020-8794

USN: 4875-1