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Ubuntu 18.04 LTS : libmicrodns vulnerabilities (USN-7239-1)

critical Nessus Plugin ID 214737

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Synopsis

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

Description

The remote Ubuntu 18.04 LTS host has packages installed that are affected by multiple vulnerabilities as referenced in the USN-7239-1 advisory.

 It was discovered that libmicrodns could recursively follow the same compression pointer, leading to an infinite loop. An attacker could possibly use this issue to cause a denial of service. (CVE-2020-6071)

 It was discovered that libmicrodns did not check the return value of the rr_decode function, which could lead to a double free. An attacker could possibly use this issue to execute arbitrary code.
 (CVE-2020-6072)

 It was discovered that libmicrodns incorrectly handled certain inputs, which could lead to an integer overflow. An attacker could possibly use this issue to cause a denial of service. (CVE-2020-6073)

 It was discovered that libmicrodns incorrectly handled certain inputs, which could lead to a out-of-bounds read. An attacker could possibly use this issue to cause a denial of service. (CVE-2020-6077)

 It was discovered that libmicrodns incorrectly handled memory when parsing mDNS messages in mdns_recv, which could lead to a NULL pointer dereference. An attacker could possibly use this issue to cause a denial of service. (CVE-2020-6078)

 It was discovered that libmicrodns incorrectly handled memory, which could lead to excessive memory consumption due to memory leaks. An attacker could possibly use this issue to cause a denial of service.
 (CVE-2020-6079, CVE-2020-6080)

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 libmicrodns-dev and / or libmicrodns0 packages.

See Also

https://ubuntu.com/security/notices/USN-7239-1

Plugin Details

Severity: Critical

ID: 214737

File Name: ubuntu_USN-7239-1.nasl

Version: 1.1

Type: local

Agent: unix

Published: 1/28/2025

Updated: 1/28/2025

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

Risk Information

VPR

Risk Factor: Medium

Score: 6.7

CVSS v2

Risk Factor: High

Base Score: 7.5

Temporal Score: 5.9

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

CVSS Score Source: CVE-2020-6072

CVSS v3

Risk Factor: Critical

Base Score: 9.8

Temporal Score: 8.8

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:P/RL:O/RC:C

Vulnerability Information

CPE: p-cpe:/a:canonical:ubuntu_linux:libmicrodns0, cpe:/o:canonical:ubuntu_linux:18.04:-:lts, p-cpe:/a:canonical:ubuntu_linux:libmicrodns-dev

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

Exploit Available: true

Exploit Ease: Exploits are available

Patch Publication Date: 1/28/2025

Vulnerability Publication Date: 3/24/2020

Reference Information

CVE: CVE-2020-6071, CVE-2020-6072, CVE-2020-6073, CVE-2020-6077, CVE-2020-6078, CVE-2020-6079, CVE-2020-6080

USN: 7239-1