Executive Summary

Summary
Title Linux kernel (Azure) vulnerabilities
Informations
NameUSN-3878-2First vendor Publication2019-02-07
VendorUbuntuLast vendor Modification2019-02-07
Severity (Vendor) N/ARevisionN/A

Security-Database Scoring CVSS v2

Cvss vector : (AV:L/AC:L/Au:N/C:C/I:C/A:C)
Cvss Base Score7.2Attack RangeLocal
Cvss Impact Score10Attack ComplexityLow
Cvss Expoit Score3.9AuthenticationNone Required
Calculate full CVSS 2.0 Vectors scores

Detail

A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 18.10

Summary:

Several security issues were fixed in the Linux kernel.

Software Description: - linux-azure: Linux kernel for Microsoft Azure Cloud systems

Details:

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)

Update instructions:

The problem can be corrected by updating your system to the following package versions:

Ubuntu 18.10:
linux-image-4.18.0-1008-azure 4.18.0-1008.8
linux-image-azure 4.18.0.1008.9

After a standard system update you need to reboot your computer to make all the necessary changes.

ATTENTION: Due to an unavoidable ABI change the kernel updates have been given a new version number, which requires you to recompile and reinstall all third party kernel modules you might have installed. Unless you manually uninstalled the standard kernel metapackages (e.g. linux-generic, linux-generic-lts-RELEASE, linux-virtual, linux-powerpc), a standard system upgrade will automatically perform this as well.

References:
https://usn.ubuntu.com/usn/usn-3878-2
https://usn.ubuntu.com/usn/usn-3878-1
CVE-2018-14625, CVE-2018-16882, CVE-2018-19407, CVE-2018-19854

Package Information:
https://launchpad.net/ubuntu/+source/linux-azure/4.18.0-1008.8

Original Source

Url : http://www.ubuntu.com/usn/USN-3878-2

CWE : Common Weakness Enumeration

%idName
25 %CWE-476NULL Pointer Dereference
25 %CWE-416Use After Free
25 %CWE-362Race Condition
25 %CWE-200Information Exposure

CPE : Common Platform Enumeration

TypeDescriptionCount
Os4
Os1
Os2999

Nessus® Vulnerability Scanner

DateDescription
2019-01-14Name : The remote Amazon Linux AMI host is missing a security update.
File : ala_ALAS-2019-1145.nasl - Type : ACT_GATHER_INFO
2019-01-10Name : The remote Amazon Linux 2 host is missing a security update.
File : al2_ALAS-2019-1145.nasl - Type : ACT_GATHER_INFO
2019-01-03Name : The remote Fedora host is missing one or more security updates.
File : fedora_2018-3857a8b41a.nasl - Type : ACT_GATHER_INFO
2019-01-03Name : The remote Fedora host is missing one or more security updates.
File : fedora_2018-6e8c330d50.nasl - Type : ACT_GATHER_INFO
2019-01-03Name : The remote Fedora host is missing one or more security updates.
File : fedora_2018-2645eb8dab.nasl - Type : ACT_GATHER_INFO
2019-01-03Name : The remote Fedora host is missing one or more security updates.
File : fedora_2018-87ba0312c2.nasl - Type : ACT_GATHER_INFO
2018-12-21Name : The remote Amazon Linux AMI host is missing a security update.
File : ala_ALAS-2018-1133.nasl - Type : ACT_GATHER_INFO
2018-12-20Name : The remote Amazon Linux 2 host is missing a security update.
File : al2_ALAS-2018-1133.nasl - Type : ACT_GATHER_INFO

Alert History

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0
1
DateInformations
2019-03-05 21:21:44
  • Multiple Updates
2019-02-08 00:19:14
  • First insertion