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Ubuntu 16.04 LTS / 18.04 LTS : Linux kernel vulnerabilities (USN-4485-1)

high Nessus Plugin ID 140183

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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-4485-1 advisory.

 Timothy Michaud discovered that the i915 graphics driver in the Linux kernel did not properly validate user memory locations for the i915_gem_execbuffer2_ioctl. A local attacker could possibly use this to cause a denial of service or execute arbitrary code. (CVE-2018-20669)

 It was discovered that the Kvaser CAN/USB driver in the Linux kernel did not properly initialize memory in certain situations. A local attacker could possibly use this to expose sensitive information (kernel memory). (CVE-2019-19947)

 Chuhong Yuan discovered that go7007 USB audio device driver in the Linux kernel did not properly deallocate memory in some failure conditions. A physically proximate attacker could use this to cause a denial of service (memory exhaustion). (CVE-2019-20810)

 It was discovered that the elf handling code in the Linux kernel did not initialize memory before using it in certain situations. A local attacker could use this to possibly expose sensitive information (kernel memory). (CVE-2020-10732)

 It was discovered that the Linux kernel did not correctly apply Speculative Store Bypass Disable (SSBD) mitigations in certain situations. A local attacker could possibly use this to expose sensitive information. (CVE-2020-10766)

 It was discovered that the Linux kernel did not correctly apply Indirect Branch Predictor Barrier (IBPB) mitigations in certain situations. A local attacker could possibly use this to expose sensitive information. (CVE-2020-10767)

 It was discovered that the Linux kernel could incorrectly enable Indirect Branch Speculation after it has been disabled for a process via a prctl() call. A local attacker could possibly use this to expose sensitive information. (CVE-2020-10768)

 Luca Bruno discovered that the zram module in the Linux kernel did not properly restrict unprivileged users from accessing the hot_add sysfs file. A local attacker could use this to cause a denial of service (memory exhaustion). (CVE-2020-10781)

 It was discovered that the XFS file system implementation in the Linux kernel did not properly validate meta data in some circumstances. An attacker could use this to construct a malicious XFS image that, when mounted, could cause a denial of service. (CVE-2020-12655)

 It was discovered that the bcache subsystem in the Linux kernel did not properly release a lock in some error conditions. A local attacker could possibly use this to cause a denial of service. (CVE-2020-12771)

 It was discovered that the Virtual Terminal keyboard driver in the Linux kernel contained an integer overflow. A local attacker could possibly use this to have an unspecified impact. (CVE-2020-13974)

 Kyungtae Kim discovered that the USB testing driver in the Linux kernel did not properly deallocate memory on disconnect events. A physically proximate attacker could use this to cause a denial of service (memory exhaustion). (CVE-2020-15393)

 It was discovered that the NFS server implementation in the Linux kernel did not properly honor umask settings when setting permissions while creating file system objects if the underlying file system did not support ACLs. An attacker could possibly use this to expose sensitive information or violate system integrity. (CVE-2020-24394)

 It was discovered that the Kerberos SUNRPC GSS implementation in the Linux kernel did not properly deallocate memory on module unload. A local privileged attacker could possibly use this to cause a denial of service (memory exhaustion). (CVE-2020-12656)

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-4485-1

Plugin Details

Severity: High

ID: 140183

File Name: ubuntu_USN-4485-1.nasl

Version: 1.9

Type: local

Agent: unix

Published: 9/2/2020

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-2020-13974

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-4.15.0-1067-gke, p-cpe:/a:canonical:ubuntu_linux:linux-image-4.15.0-1081-gcp, p-cpe:/a:canonical:ubuntu_linux:linux-image-4.15.0-1068-raspi2, p-cpe:/a:canonical:ubuntu_linux:linux-image-4.15.0-1094-oem, p-cpe:/a:canonical:ubuntu_linux:linux-image-4.15.0-1084-snapdragon, cpe:/o:canonical:ubuntu_linux:16.04:-:lts, cpe:/o:canonical:ubuntu_linux:18.04:-:lts, p-cpe:/a:canonical:ubuntu_linux:linux-image-4.15.0-115-generic, p-cpe:/a:canonical:ubuntu_linux:linux-image-4.15.0-1051-oracle, p-cpe:/a:canonical:ubuntu_linux:linux-image-4.15.0-115-lowlatency, p-cpe:/a:canonical:ubuntu_linux:linux-image-4.15.0-1072-kvm, p-cpe:/a:canonical:ubuntu_linux:linux-image-4.15.0-115-generic-lpae, p-cpe:/a:canonical:ubuntu_linux:linux-image-4.15.0-1080-aws, p-cpe:/a:canonical:ubuntu_linux:linux-image-4.15.0-1093-azure

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: 9/3/2020

Vulnerability Publication Date: 3/21/2019

Reference Information

CVE: CVE-2018-20669, CVE-2019-19947, CVE-2019-20810, CVE-2020-10732, CVE-2020-10766, CVE-2020-10767, CVE-2020-10768, CVE-2020-10781, CVE-2020-12655, CVE-2020-12656, CVE-2020-12771, CVE-2020-13974, CVE-2020-15393, CVE-2020-24394

USN: 4485-1