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Ubuntu 16.04 LTS / 18.04 LTS : Linux kernel vulnerabilities (USN-4426-1)

high Nessus Plugin ID 138835

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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 host has a package installed that is affected by multiple vulnerabilities as referenced in the USN-4426-1 advisory.

 Jason A. Donenfeld discovered that the ACPI implementation in the Linux kernel did not properly restrict loading SSDT code from an EFI variable. A privileged attacker could use this to bypass Secure Boot lockdown restrictions and execute arbitrary code in the kernel. (CVE-2019-20908)

 Fan Yang discovered that the mremap implementation in the Linux kernel did not properly handle DAX Huge Pages. A local attacker with access to DAX storage could use this to gain administrative privileges.
 (CVE-2020-10757)

 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-4426-1

Plugin Details

Severity: High

ID: 138835

File Name: ubuntu_USN-4426-1.nasl

Version: 1.10

Type: local

Agent: unix

Published: 7/22/2020

Updated: 8/27/2024

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: 7.2

Temporal Score: 5.6

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

CVSS Score Source: CVE-2020-15780

CVSS v3

Risk Factor: High

Base Score: 7.8

Temporal Score: 7

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:P/RL:O/RC:C

CVSS Score Source: CVE-2020-10757

Vulnerability Information

CPE: p-cpe:/a:canonical:ubuntu_linux:linux-image-4.15.0-1050-oracle, cpe:/o:canonical:ubuntu_linux:16.04:-:lts, cpe:/o:canonical:ubuntu_linux:18.04:-:lts, p-cpe:/a:canonical:ubuntu_linux:linux-image-4.15.0-1066-gke, p-cpe:/a:canonical:ubuntu_linux:linux-image-4.15.0-1092-azure, p-cpe:/a:canonical:ubuntu_linux:linux-image-4.15.0-112-lowlatency, p-cpe:/a:canonical:ubuntu_linux:linux-image-4.15.0-1067-raspi2, p-cpe:/a:canonical:ubuntu_linux:linux-image-4.15.0-112-generic-lpae, p-cpe:/a:canonical:ubuntu_linux:linux-image-4.15.0-1093-oem, p-cpe:/a:canonical:ubuntu_linux:linux-image-4.15.0-1080-gcp, p-cpe:/a:canonical:ubuntu_linux:linux-image-4.15.0-1071-kvm, p-cpe:/a:canonical:ubuntu_linux:linux-image-4.15.0-1079-aws, p-cpe:/a:canonical:ubuntu_linux:linux-image-4.15.0-112-generic

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: 7/27/2020

Vulnerability Publication Date: 6/9/2020

Reference Information

CVE: CVE-2019-20908, CVE-2020-10757, CVE-2020-11935, CVE-2020-15780

USN: 4426-1