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Ubuntu 16.04 LTS / 18.04 LTS : Linux kernel vulnerabilities (USN-4890-1)

medium Nessus Plugin ID 148108

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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-4890-1 advisory.

 Piotr Krysiuk discovered that the BPF subsystem in the Linux kernel did not properly compute a speculative execution limit on pointer arithmetic in some situations. A local attacker could use this to expose sensitive information (kernel memory). (CVE-2020-27171)

 Piotr Krysiuk discovered that the BPF subsystem in the Linux kernel did not properly apply speculative execution limits on some pointer types. A local attacker could use this to expose sensitive information (kernel memory). (CVE-2020-27170)

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-4890-1

Plugin Details

Severity: Medium

ID: 148108

File Name: ubuntu_USN-4890-1.nasl

Version: 1.8

Type: local

Agent: unix

Published: 3/25/2021

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: 5.2

CVSS v2

Risk Factor: Low

Base Score: 3.6

Temporal Score: 2.7

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

CVSS Score Source: CVE-2020-27171

CVSS v3

Risk Factor: Medium

Base Score: 6

Temporal Score: 5.2

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

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

Vulnerability Information

CPE: p-cpe:/a:canonical:ubuntu_linux:linux-image-4.15.0-1096-gcp, p-cpe:/a:canonical:ubuntu_linux:linux-image-4.15.0-1088-kvm, p-cpe:/a:canonical:ubuntu_linux:linux-image-4.15.0-1068-oracle, cpe:/o:canonical:ubuntu_linux:16.04:-:lts, p-cpe:/a:canonical:ubuntu_linux:linux-image-4.15.0-1082-raspi2, cpe:/o:canonical:ubuntu_linux:18.04:-:lts, p-cpe:/a:canonical:ubuntu_linux:linux-image-4.15.0-1015-dell300x, p-cpe:/a:canonical:ubuntu_linux:linux-image-4.15.0-140-lowlatency, p-cpe:/a:canonical:ubuntu_linux:linux-image-4.15.0-1111-azure, p-cpe:/a:canonical:ubuntu_linux:linux-image-4.15.0-140-generic, p-cpe:/a:canonical:ubuntu_linux:linux-image-4.15.0-1097-aws, p-cpe:/a:canonical:ubuntu_linux:linux-image-4.15.0-1099-snapdragon, p-cpe:/a:canonical:ubuntu_linux:linux-image-4.15.0-140-generic-lpae

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

Exploit Ease: No known exploits are available

Patch Publication Date: 3/25/2021

Vulnerability Publication Date: 3/20/2021

Reference Information

CVE: CVE-2020-27170, CVE-2020-27171

USN: 4890-1