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Ubuntu 18.04 LTS / 20.04 LTS : Linux kernel vulnerabilities (USN-5017-1)

high Nessus Plugin ID 153129

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Synopsis

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

Description

The remote Ubuntu 18.04 LTS / 20.04 LTS host has a package installed that is affected by multiple vulnerabilities as referenced in the USN-5017-1 advisory.

 It was discovered that the virtual file system implementation in the Linux kernel contained an unsigned to signed integer conversion error. A local attacker could use this to cause a denial of service (system crash) or execute arbitrary code. (CVE-2021-33909)

 It was discovered that the bluetooth subsystem in the Linux kernel did not properly perform access control. An authenticated attacker could possibly use this to expose sensitive information.
 (CVE-2020-26558, CVE-2021-0129)

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 kernel package.

See Also

https://ubuntu.com/security/notices/USN-5017-1

Plugin Details

Severity: High

ID: 153129

File Name: ubuntu_USN-5017-1.nasl

Version: 1.7

Type: local

Agent: unix

Published: 9/8/2021

Updated: 8/27/2024

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

Risk Information

VPR

Risk Factor: Critical

Score: 9.0

CVSS v2

Risk Factor: High

Base Score: 7.2

Temporal Score: 6.3

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

CVSS Score Source: CVE-2021-33909

CVSS v3

Risk Factor: High

Base Score: 7.8

Temporal Score: 7.5

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

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

Vulnerability Information

CPE: p-cpe:/a:canonical:ubuntu_linux:linux-image-5.4.0-1021-gkeop, cpe:/o:canonical:ubuntu_linux:20.04:-:lts, p-cpe:/a:canonical:ubuntu_linux:linux-image-5.4.0-80-generic, p-cpe:/a:canonical:ubuntu_linux:linux-image-5.4.0-1055-azure, p-cpe:/a:canonical:ubuntu_linux:linux-image-5.4.0-1044-kvm, cpe:/o:canonical:ubuntu_linux:18.04:-:lts, p-cpe:/a:canonical:ubuntu_linux:linux-image-5.4.0-1041-raspi, p-cpe:/a:canonical:ubuntu_linux:linux-image-5.4.0-1054-aws, p-cpe:/a:canonical:ubuntu_linux:linux-image-5.4.0-80-generic-lpae, p-cpe:/a:canonical:ubuntu_linux:linux-image-5.4.0-80-lowlatency, p-cpe:/a:canonical:ubuntu_linux:linux-image-5.4.0-1049-gcp, p-cpe:/a:canonical:ubuntu_linux:linux-image-5.4.0-1052-oracle

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: 7/20/2021

Vulnerability Publication Date: 5/24/2021

Reference Information

CVE: CVE-2020-26558, CVE-2021-0129, CVE-2021-33909

IAVA: 2021-A-0350

USN: 5017-1