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Ubuntu 16.04 LTS : Linux kernel vulnerabilities (USN-4748-1)

high Nessus Plugin ID 147975

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Synopsis

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

Description

The remote Ubuntu 16.04 LTS host has a package installed that is affected by multiple vulnerabilities as referenced in the USN-4748-1 advisory.

 It was discovered that the jfs file system implementation in the Linux kernel contained an out-of-bounds read vulnerability. A local attacker could use this to possibly cause a denial of service (system crash).
 (CVE-2020-27815)

 It was discovered that the memory management subsystem in the Linux kernel did not properly handle copy- on-write operations in some situations. A local attacker could possibly use this to gain unintended write access to read-only memory pages. (CVE-2020-29374)

 Michael Kurth and Pawel Wieczorkiewicz discovered that the Xen event processing backend in the Linux kernel did not properly limit the number of events queued. An attacker in a guest VM could use this to cause a denial of service in the host OS. (CVE-2020-29568)

 Jann Horn discovered that the tty subsystem of the Linux kernel did not use consistent locking in some situations, leading to a read-after-free vulnerability. A local attacker could use this to cause a denial of service (system crash) or possibly expose sensitive information (kernel memory). (CVE-2020-29660)

 Jann Horn discovered a race condition in the tty subsystem of the Linux kernel in the locking for the TIOCSPGRP ioctl(), 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-2020-29661)

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-4748-1

Plugin Details

Severity: High

ID: 147975

File Name: ubuntu_USN-4748-1.nasl

Version: 1.7

Type: local

Agent: unix

Published: 3/23/2021

Updated: 8/27/2024

Supported Sensors: Frictionless Assessment AWS, Frictionless Assessment Azure, Frictionless Assessment Agent, Nessus Agent, Agentless Assessment, Continuous Assessment, 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-2020-29661

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-4.4.0-1088-kvm, p-cpe:/a:canonical:ubuntu_linux:linux-image-4.4.0-203-lowlatency, p-cpe:/a:canonical:ubuntu_linux:linux-image-4.4.0-1146-raspi2, cpe:/o:canonical:ubuntu_linux:16.04:-:lts, p-cpe:/a:canonical:ubuntu_linux:linux-image-4.4.0-1150-snapdragon, p-cpe:/a:canonical:ubuntu_linux:linux-image-4.4.0-203-powerpc64-emb, p-cpe:/a:canonical:ubuntu_linux:linux-image-4.4.0-1122-aws, p-cpe:/a:canonical:ubuntu_linux:linux-image-4.4.0-203-powerpc-smp, p-cpe:/a:canonical:ubuntu_linux:linux-image-4.4.0-203-generic, p-cpe:/a:canonical:ubuntu_linux:linux-image-4.4.0-203-generic-lpae, p-cpe:/a:canonical:ubuntu_linux:linux-image-4.4.0-203-powerpc-e500mc, p-cpe:/a:canonical:ubuntu_linux:linux-image-4.4.0-203-powerpc64-smp

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

Exploit Available: true

Exploit Ease: Exploits are available

Patch Publication Date: 2/25/2021

Vulnerability Publication Date: 11/28/2020

Reference Information

CVE: CVE-2020-27815, CVE-2020-29374, CVE-2020-29568, CVE-2020-29660, CVE-2020-29661

USN: 4748-1