Detections
Analytics

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

high Nessus Plugin ID 147975

Language:

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.

 - A flaw was found in the JFS filesystem code in the Linux Kernel which allows a local attacker with the ability to set extended attributes to panic the system, causing memory corruption or escalating privileges. The highest threat from this vulnerability is to confidentiality, integrity, as well as system availability. (CVE-2020-27815)

 - An issue was discovered in the Linux kernel before 5.7.3, related to mm/gup.c and mm/huge_memory.c. The get_user_pages (aka gup) implementation, when used for a copy-on-write page, does not properly consider the semantics of read operations and therefore can grant unintended write access, aka CID-17839856fd58.
 (CVE-2020-29374)

 - An issue was discovered in Xen through 4.14.x. Some OSes (such as Linux, FreeBSD, and NetBSD) are processing watch events using a single thread. If the events are received faster than the thread is able to handle, they will get queued. As the queue is unbounded, a guest may be able to trigger an OOM in the backend. All systems with a FreeBSD, Linux, or NetBSD (any version) dom0 are vulnerable. (CVE-2020-29568)

 - A locking inconsistency issue was discovered in the tty subsystem of the Linux kernel through 5.9.13.
 drivers/tty/tty_io.c and drivers/tty/tty_jobctrl.c may allow a read-after-free attack against TIOCGSID, aka CID-c8bcd9c5be24. (CVE-2020-29660)

 - A locking issue was discovered in the tty subsystem of the Linux kernel through 5.9.13.
 drivers/tty/tty_jobctrl.c allows a use-after-free attack against TIOCSPGRP, aka CID-54ffccbf053b.
 (CVE-2020-29661)

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: 1.6

Type: local

Agent: unix

Published: 3/23/2021

Updated: 1/9/2024

Supported Sensors: Frictionless Assessment AWS, Frictionless Assessment Azure, Frictionless Assessment Agent, Nessus Agent, Agentless 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: cpe:/o:canonical:ubuntu_linux:16.04:-:lts, p-cpe:/a:canonical:ubuntu_linux:linux-image-4.4.0-1088-kvm, p-cpe:/a:canonical:ubuntu_linux:linux-image-4.4.0-1122-aws, p-cpe:/a:canonical:ubuntu_linux:linux-image-4.4.0-1146-raspi2, 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-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-lowlatency, 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-powerpc-smp, p-cpe:/a:canonical:ubuntu_linux:linux-image-4.4.0-203-powerpc64-emb, p-cpe:/a:canonical:ubuntu_linux:linux-image-4.4.0-203-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