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Ubuntu 18.04 LTS / 20.04 LTS : Linux kernel vulnerabilities (USN-4425-1)

medium Nessus Plugin ID 138834

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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-4425-1 advisory.

 It was discovered that the network block device (nbd) implementation in the Linux kernel did not properly check for error conditions in some situations. An attacker could possibly use this to cause a denial of service (system crash). (CVE-2019-16089)

 It was discovered that the kernel->user space relay implementation in the Linux kernel did not properly check return values in some situations. A local attacker could possibly use this to cause a denial of service (system crash). (CVE-2019-19462)

 Mauricio Faria de Oliveira discovered that the aufs implementation in the Linux kernel improperly managed inode reference counts in the vfsub_dentry_open() method. A local attacker could use this vulnerability to cause a denial of service. (CVE-2020-11935)

 Jason A. Donenfeld discovered that the ACPI implementation in the Linux kernel did not properly restrict loading ACPI tables via configfs. A privileged attacker could use this to bypass Secure Boot lockdown restrictions and execute arbitrary code in the kernel. (CVE-2020-15780)

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-4425-1

Plugin Details

Severity: Medium

ID: 138834

File Name: ubuntu_USN-4425-1.nasl

Version: 1.9

Type: local

Agent: unix

Published: 7/22/2020

Updated: 8/27/2024

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

Risk Information

VPR

Risk Factor: Medium

Score: 6.7

CVSS v2

Risk Factor: High

Base Score: 7.2

Temporal Score: 5.3

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

CVSS Score Source: CVE-2020-15780

CVSS v3

Risk Factor: Medium

Base Score: 6.7

Temporal Score: 5.8

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

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

Vulnerability Information

CPE: p-cpe:/a:canonical:ubuntu_linux:linux-image-5.4.0-42-generic, p-cpe:/a:canonical:ubuntu_linux:linux-image-5.4.0-30-generic, p-cpe:/a:canonical:ubuntu_linux:linux-image-5.4.0-42-generic-lpae, cpe:/o:canonical:ubuntu_linux:20.04:-:lts, cpe:/o:canonical:ubuntu_linux:18.04:-:lts, p-cpe:/a:canonical:ubuntu_linux:linux-image-5.4.0-1020-aws, p-cpe:/a:canonical:ubuntu_linux:linux-image-5.4.0-42-lowlatency, p-cpe:/a:canonical:ubuntu_linux:linux-image-5.4.0-1015-raspi, p-cpe:/a:canonical:ubuntu_linux:linux-image-5.4.0-1021-gcp, p-cpe:/a:canonical:ubuntu_linux:linux-image-5.4.0-1021-oracle, p-cpe:/a:canonical:ubuntu_linux:linux-image-5.4.0-1022-azure

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

Exploit Ease: No known exploits are available

Patch Publication Date: 7/27/2020

Vulnerability Publication Date: 9/6/2019

Reference Information

CVE: CVE-2019-16089, CVE-2019-19462, CVE-2020-11935, CVE-2020-15780

USN: 4425-1