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Ubuntu 20.04 LTS : Linux kernel vulnerabilities (USN-4678-1)

high Nessus Plugin ID 144751

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Synopsis

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

Description

The remote Ubuntu 20.04 LTS host has a package installed that is affected by multiple vulnerabilities as referenced in the USN-4678-1 advisory.

 It was discovered that the AMD Running Average Power Limit (RAPL) driver in the Linux kernel did not properly restrict access to power data. A local attacker could possibly use this to expose sensitive information. (CVE-2020-12912)

 Jann Horn discovered that the io_uring subsystem in the Linux kernel did not properly perform reference counting in some situations. A local attacker could use this to expose sensitive information or possibly escalate privileges. (CVE-2020-29534)

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-4678-1

Plugin Details

Severity: High

ID: 144751

File Name: ubuntu_USN-4678-1.nasl

Version: 1.8

Type: local

Agent: unix

Published: 1/6/2021

Updated: 8/29/2024

Supported Sensors: Agentless 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-2020-29534

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

Vulnerability Information

CPE: p-cpe:/a:canonical:ubuntu_linux:linux-image-5.8.0-34-lowlatency, p-cpe:/a:canonical:ubuntu_linux:linux-image-5.8.0-34-generic, cpe:/o:canonical:ubuntu_linux:20.04:-:lts, p-cpe:/a:canonical:ubuntu_linux:linux-image-5.8.0-34-generic-lpae

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: 1/6/2021

Vulnerability Publication Date: 11/12/2020

Reference Information

CVE: CVE-2020-12912, CVE-2020-29534

USN: 4678-1