Ubuntu 18.04 LTS : Linux kernel vulnerabilities (USN-4301-1)

medium Nessus Plugin ID 134659
New! Plugin Severity Now Using CVSS v3

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Synopsis

The remote Ubuntu host is missing one or more security-related patches.

Description

It was discovered that the KVM implementation in the Linux kernel, when paravirtual TLB flushes are enabled in guests, the hypervisor in some situations could miss deferred TLB flushes or otherwise mishandle them. An attacker in a guest VM could use this to expose sensitive information (read memory from another guest VM). (CVE-2019-3016)

Paulo Bonzini discovered that the KVM hypervisor implementation in the Linux kernel could improperly let a nested (level 2) guest access the resources of a parent (level 1) guest in certain situations. An attacker could use this to expose sensitive information.
(CVE-2020-2732)

It was discovered that the RPMSG character device interface in the Linux kernel did not properly deallocate memory in certain error conditions. A local attacker could possibly use this to cause a denial of service (kernel memory exhaustion). (CVE-2019-19053)

It was discovered that the Marvell Wi-Fi device driver in the Linux kernel did not properly deallocate memory in certain error conditions.
A local attacker could use this to possibly cause a denial of service (kernel memory exhaustion). (CVE-2019-19056)

It was discovered that the Intel Wi-Fi device driver in the Linux kernel device driver in the Linux kernel did not properly deallocate memory in certain error conditions. A local attacker could possibly use this to cause a denial of service (kernel memory exhaustion).
(CVE-2019-19058, CVE-2019-19059)

It was discovered that the Brocade BFA Fibre Channel device driver in the Linux kernel did not properly deallocate memory in certain error conditions. A local attacker could possibly use this to cause a denial of service (kernel memory exhaustion). (CVE-2019-19066)

It was discovered that the Realtek RTL8xxx USB Wi-Fi device driver in the Linux kernel did not properly deallocate memory in certain error conditions. A local attacker could possibly use this to cause a denial of service (kernel memory exhaustion). (CVE-2019-19068).

Note that Tenable Network Security has extracted the preceding description block directly from the Ubuntu security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

Solution

Update the affected packages.

See Also

https://usn.ubuntu.com/4301-1/

Plugin Details

Severity: Medium

ID: 134659

File Name: ubuntu_USN-4301-1.nasl

Version: 1.4

Type: local

Agent: unix

Published: 3/18/2020

Updated: 9/17/2020

Dependencies: ssh_get_info.nasl, linux_alt_patch_detect.nasl

Risk Information

CVSS Score Source: CVE-2020-2732

VPR

Risk Factor: Medium

Score: 4.4

CVSS v2

Risk Factor: Low

Base Score: 2.3

Temporal Score: 1.7

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

Temporal Vector: E:U/RL:OF/RC:C

CVSS v3

Risk Factor: Medium

Base Score: 6.8

Temporal Score: 5.9

Vector: CVSS:3.0/AV:A/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N

Temporal Vector: E:U/RL:O/RC:C

Vulnerability Information

CPE: p-cpe:/a:canonical:ubuntu_linux:linux-image-5.0-aws, p-cpe:/a:canonical:ubuntu_linux:linux-image-5.0-azure, p-cpe:/a:canonical:ubuntu_linux:linux-image-5.0-gcp, p-cpe:/a:canonical:ubuntu_linux:linux-image-5.0-gke, p-cpe:/a:canonical:ubuntu_linux:linux-image-5.0-oem-osp1, p-cpe:/a:canonical:ubuntu_linux:linux-image-5.0-oracle, p-cpe:/a:canonical:ubuntu_linux:linux-image-aws-edge, p-cpe:/a:canonical:ubuntu_linux:linux-image-azure, p-cpe:/a:canonical:ubuntu_linux:linux-image-gcp, p-cpe:/a:canonical:ubuntu_linux:linux-image-gke-5.0, p-cpe:/a:canonical:ubuntu_linux:linux-image-oem-osp1, p-cpe:/a:canonical:ubuntu_linux:linux-image-oracle, cpe:/o:canonical:ubuntu_linux:18.04:-:lts

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

Exploit Ease: No known exploits are available

Patch Publication Date: 3/25/2020

Vulnerability Publication Date: 11/18/2019

Reference Information

CVE: CVE-2019-19053, CVE-2019-19056, CVE-2019-19058, CVE-2019-19059, CVE-2019-19066, CVE-2019-19068, CVE-2019-3016, CVE-2020-2732

USN: 4301-1