Detections
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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.

 It was discovered that OpenSMTPD incorrectly verified the sender's or receiver's e-mail addresses under certain conditions. An attacker could possibly use this vulnerability to execute arbitrary commands as root. (CVE-2020-7247)

 It was discovered that OpenSMTPD did not properly handle hardlinks under certain conditions. An unprivileged local attacker could possibly use this issue to obtain sensitive information. This issue only affected Ubuntu 16.04 ESM. (CVE-2020-8793)

 It was discovered that OpenSMTPD mishandled certain input. A remote, unauthenticated attacker could possibly use this vulnerability to execute arbitrary shell commands as any non-root user. This issue only affected Ubuntu 16.04 ESM. (CVE-2020-8794)

Tenable has extracted the preceding description block directly from the Ubuntu 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

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: 1.2

Type: local

Agent: unix

Published: 10/20/2023

Updated: 8/28/2024

Supported Sensors: Frictionless Assessment AWS, Frictionless Assessment Azure, Frictionless Assessment Agent, Nessus Agent, Agentless Assessment, Continuous 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: p-cpe:/a:canonical:ubuntu_linux:opensmtpd, cpe:/o:canonical:ubuntu_linux:16.04:-:esm

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