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Ubuntu 18.04 LTS / 20.04 LTS : Linux kernel vulnerabilities (USN-4576-1)

high Nessus Plugin ID 141451

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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-4576-1 advisory.

 Hadar Manor discovered that the DCCP protocol implementation in the Linux kernel improperly handled socket reuse, leading to a use-after-free vulnerability. A local attacker could use this to cause a denial of service (system crash) or possibly execute arbitrary code. (CVE-2020-16119)

 Jay Shin discovered that the ext4 file system implementation in the Linux kernel did not properly handle directory access with broken indexing, leading to an out-of-bounds read vulnerability. A local attacker could use this to cause a denial of service (system crash). (CVE-2020-14314)

 David Alan Gilbert discovered that the XFS file system implementation in the Linux kernel did not properly perform metadata validation in some circumstances. A local attacker could use this to cause a denial of service. (CVE-2020-14385)

 Giuseppe Scrivano discovered that the overlay file system in the Linux kernel did not properly perform permission checks in some situations. A local attacker could possibly use this to bypass intended restrictions and gain read access to restricted files. (CVE-2020-16120)

 It was discovered that a race condition existed in the hugetlb sysctl implementation in the Linux kernel.
 A privileged attacker could use this to cause a denial of service (system crash). (CVE-2020-25285)

 It was discovered that the block layer subsystem in the Linux kernel did not properly handle zero-length requests. A local attacker could use this to cause a denial of service. (CVE-2020-25641)

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-4576-1

Plugin Details

Severity: High

ID: 141451

File Name: ubuntu_USN-4576-1.nasl

Version: 1.8

Type: local

Agent: unix

Published: 10/14/2020

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: 5.9

CVSS v2

Risk Factor: Medium

Base Score: 4.6

Temporal Score: 3.4

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

CVSS Score Source: CVE-2020-16119

CVSS v3

Risk Factor: High

Base Score: 7.8

Temporal Score: 6.8

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:U/RL:O/RC:C

Vulnerability Information

CPE: p-cpe:/a:canonical:ubuntu_linux:linux-image-5.4.0-1028-aws, p-cpe:/a:canonical:ubuntu_linux:linux-image-5.4.0-1026-kvm, cpe:/o:canonical:ubuntu_linux:20.04:-:lts, p-cpe:/a:canonical:ubuntu_linux:linux-image-5.4.0-1028-gcp, p-cpe:/a:canonical:ubuntu_linux:linux-image-5.4.0-51-generic, p-cpe:/a:canonical:ubuntu_linux:linux-image-5.4.0-51-lowlatency, cpe:/o:canonical:ubuntu_linux:18.04:-:lts, p-cpe:/a:canonical:ubuntu_linux:linux-image-5.4.0-1031-azure, p-cpe:/a:canonical:ubuntu_linux:linux-image-5.4.0-1028-oracle, p-cpe:/a:canonical:ubuntu_linux:linux-image-5.4.0-1021-raspi, p-cpe:/a:canonical:ubuntu_linux:linux-image-5.4.0-51-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: 10/14/2020

Vulnerability Publication Date: 9/13/2020

Reference Information

CVE: CVE-2020-14314, CVE-2020-14385, CVE-2020-16119, CVE-2020-16120, CVE-2020-25285, CVE-2020-25641

USN: 4576-1