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Ubuntu 20.04 LTS : Linux kernel vulnerabilities (USN-4367-1)

high Nessus Plugin ID 136732

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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-4367-1 advisory.

 It was discovered that the btrfs implementation in the Linux kernel did not properly detect that a block was marked dirty in some situations. An attacker could use this to specially craft a file system image that, when unmounted, could cause a denial of service (system crash). (CVE-2019-19377)

 It was discovered that the linux kernel did not properly validate certain mount options to the tmpfs virtual memory file system. A local attacker with the ability to specify mount options could use this to cause a denial of service (system crash). (CVE-2020-11565)

 It was discovered that the block layer in the Linux kernel contained a race condition leading to a use- after-free vulnerability. A local attacker could possibly use this to cause a denial of service (system crash) or execute arbitrary code. (CVE-2020-12657)

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-4367-1

Plugin Details

Severity: High

ID: 136732

File Name: ubuntu_USN-4367-1.nasl

Version: 1.10

Type: local

Agent: unix

Published: 5/20/2020

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: Medium

Base Score: 6.8

Temporal Score: 5.3

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

CVSS Score Source: CVE-2019-19377

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-2020-12657

Vulnerability Information

CPE: p-cpe:/a:canonical:ubuntu_linux:linux-image-5.4.0-26-generic, cpe:/o:canonical:ubuntu_linux:20.04:-:lts, p-cpe:/a:canonical:ubuntu_linux:linux-image-5.4.0-1011-raspi, p-cpe:/a:canonical:ubuntu_linux:linux-image-5.4.0-1011-aws, p-cpe:/a:canonical:ubuntu_linux:linux-image-5.4.0-1011-kvm, p-cpe:/a:canonical:ubuntu_linux:linux-image-5.4.0-1011-gcp, p-cpe:/a:canonical:ubuntu_linux:linux-image-5.4.0-1011-oracle, p-cpe:/a:canonical:ubuntu_linux:linux-image-5.4.0-31-generic-lpae, p-cpe:/a:canonical:ubuntu_linux:linux-image-5.4.0-1012-azure, p-cpe:/a:canonical:ubuntu_linux:linux-image-5.4.0-31-generic, p-cpe:/a:canonical:ubuntu_linux:linux-image-5.4.0-31-lowlatency

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: 5/24/2020

Vulnerability Publication Date: 11/29/2019

Reference Information

CVE: CVE-2019-19377, CVE-2020-11565, CVE-2020-12657, CVE-2020-12826

USN: 4367-1