Ubuntu 18.10 : linux-azure vulnerabilities (USN-3878-2)

Medium Nessus Plugin ID 122053

Synopsis

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

Description

It was discovered that a race condition existed in the vsock address
family implementation of the Linux kernel that could lead to a
use-after-free condition. A local attacker in a guest virtual machine
could use this to expose sensitive information (host machine kernel
memory). (CVE-2018-14625)

Cfir Cohen discovered that a use-after-free vulnerability existed in
the KVM implementation of the Linux kernel, when handling interrupts
in environments where nested virtualization is in use (nested KVM
virtualization is not enabled by default in Ubuntu kernels). A local
attacker in a guest VM could possibly use this to gain administrative
privileges in a host machine. (CVE-2018-16882)

Wei Wu discovered that the KVM implementation in the Linux kernel did
not properly ensure that ioapics were initialized. A local attacker
could use this to cause a denial of service (system crash).
(CVE-2018-19407)

It was discovered that the crypto subsystem of the Linux kernel leaked
uninitialized memory to user space in some situations. A local
attacker could use this to expose sensitive information (kernel
memory). (CVE-2018-19854).

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 linux-image-4.18-azure and / or linux-image-azure
packages.

See Also

https://usn.ubuntu.com/3878-2/

Plugin Details

Severity: Medium

ID: 122053

File Name: ubuntu_USN-3878-2.nasl

Version: 1.1

Type: local

Agent: unix

Published: 2019/02/08

Modified: 2019/02/08

Dependencies: 12634

Risk Information

Risk Factor: Medium

CVSS v2.0

Base Score: 4.9

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

CVSS v3.0

Base Score: 7.8

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

Vulnerability Information

CPE: p-cpe:/a:canonical:ubuntu_linux:linux-image-4.18-azure, p-cpe:/a:canonical:ubuntu_linux:linux-image-azure, cpe:/o:canonical:ubuntu_linux:18.10

Patch Publication Date: 2019/02/07

Vulnerability Publication Date: 2018/09/10

Reference Information

CVE: CVE-2018-14625, CVE-2018-16882, CVE-2018-19407, CVE-2018-19854

USN: 3878-2