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Ubuntu 16.04 LTS / 18.04 LTS / 20.04 LTS / 22.04 LTS / 24.04 LTS / 24.10 : libtar vulnerabilities (USN-7398-1)

critical Nessus Plugin ID 233574

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Synopsis

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

Description

The remote Ubuntu 16.04 LTS / 18.04 LTS / 20.04 LTS / 22.04 LTS / 24.04 LTS / 24.10 host has packages installed that are affected by multiple vulnerabilities as referenced in the USN-7398-1 advisory.

 It was discovered that libtar may perform out-of-bounds reads when processing specially crafted tar files.
 An attacker could possibly use this issue to cause libtar to crash, resulting in a denial of service, or execute arbitrary code. (CVE-2021-33643, CVE-2021-33644)

 It was discovered that libtar contained a memory leak due to failing to free a variable, causing performance degradation. An attacker could possibly use this issue to cause libtar to crash, resulting in a denial of service. (CVE-2021-33645, CVE-2021-33646)

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 libtar-dev, libtar0 and / or libtar0t64 packages.

See Also

https://ubuntu.com/security/notices/USN-7398-1

Plugin Details

Severity: Critical

ID: 233574

File Name: ubuntu_USN-7398-1.nasl

Version: 1.1

Type: local

Agent: unix

Published: 3/31/2025

Updated: 3/31/2025

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

Risk Information

VPR

Risk Factor: Medium

Score: 6.0

CVSS v2

Risk Factor: High

Base Score: 9.4

Temporal Score: 7

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

CVSS Score Source: CVE-2021-33644

CVSS v3

Risk Factor: Critical

Base Score: 9.1

Temporal Score: 7.9

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

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

CVSS Score Source: CVE-2021-33643

Vulnerability Information

CPE: cpe:/o:canonical:ubuntu_linux:20.04:-:lts, cpe:/o:canonical:ubuntu_linux:24.04:-:lts, cpe:/o:canonical:ubuntu_linux:16.04:-:lts, cpe:/o:canonical:ubuntu_linux:18.04:-:lts, cpe:/o:canonical:ubuntu_linux:22.04:-:lts, p-cpe:/a:canonical:ubuntu_linux:libtar-dev, p-cpe:/a:canonical:ubuntu_linux:libtar0t64, cpe:/o:canonical:ubuntu_linux:24.10, p-cpe:/a:canonical:ubuntu_linux:libtar0

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

Exploit Ease: No known exploits are available

Patch Publication Date: 3/31/2025

Vulnerability Publication Date: 8/9/2022

Reference Information

CVE: CVE-2021-33643, CVE-2021-33644, CVE-2021-33645, CVE-2021-33646

USN: 7398-1