Executive Summary

Summary
Title Linux kernel (HWE) vulnerabilities
Informations
Name USN-3695-2 First vendor Publication 2018-07-02
Vendor Ubuntu Last vendor Modification 2018-07-02
Severity (Vendor) N/A Revision N/A

Security-Database Scoring CVSS v3

Cvss vector : N/A
Overall CVSS Score NA
Base Score NA Environmental Score NA
impact SubScore NA Temporal Score NA
Exploitabality Sub Score NA
 
Calculate full CVSS 3.0 Vectors scores

Security-Database Scoring CVSS v2

Cvss vector : (AV:N/AC:M/Au:N/C:N/I:N/A:C)
Cvss Base Score 7.1 Attack Range Network
Cvss Impact Score 6.9 Attack Complexity Medium
Cvss Expoit Score 8.6 Authentication None Required
Calculate full CVSS 2.0 Vectors scores

Detail

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

- Ubuntu 16.04 LTS

Summary:

Several security issues were fixed in the Linux kernel.

Software Description: - linux-azure: Linux kernel for Microsoft Azure Cloud systems - linux-hwe: Linux hardware enablement (HWE) kernel

Details:

USN-3695-1 fixed vulnerabilities in the Linux kernel for Ubuntu 18.04 LTS. This update provides the corresponding updates for the Linux Hardware Enablement (HWE) kernel from Ubuntu 18.04 LTS for Ubuntu 16.04 LTS.

Wen Xu discovered that the ext4 file system implementation in the Linux kernel did not properly initialize the crc32c checksum driver. A local attacker could use this to cause a denial of service (system crash). (CVE-2018-1094)

It was discovered that the cdrom driver in the Linux kernel contained an incorrect bounds check. A local attacker could use this to expose sensitive information (kernel memory). (CVE-2018-10940)

Wen Xu discovered that the ext4 file system implementation in the Linux kernel did not properly validate xattr sizes. A local attacker could use this to cause a denial of service (system crash). (CVE-2018-1095)

Jann Horn discovered that the 32 bit adjtimex() syscall implementation for 64 bit Linux kernels did not properly initialize memory returned to user space in some situations. A local attacker could use this to expose sensitive information (kernel memory). (CVE-2018-11508)

It was discovered that an information leak vulnerability existed in the floppy driver in the Linux kernel. A local attacker could use this to expose sensitive information (kernel memory). (CVE-2018-7755)

Update instructions:

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

Ubuntu 16.04 LTS:
linux-image-4.15.0-1014-azure 4.15.0-1014.14~16.04.1
linux-image-4.15.0-24-generic 4.15.0-24.26~16.04.1
linux-image-4.15.0-24-generic-lpae 4.15.0-24.26~16.04.1
linux-image-4.15.0-24-lowlatency 4.15.0-24.26~16.04.1
linux-image-azure 4.15.0.1014.21
linux-image-generic-hwe-16.04 4.15.0.24.46
linux-image-generic-lpae-hwe-16.04 4.15.0.24.46
linux-image-lowlatency-hwe-16.04 4.15.0.24.46

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-3695-2
https://usn.ubuntu.com/usn/usn-3695-1
CVE-2018-1094, CVE-2018-10940, CVE-2018-1095, CVE-2018-11508,
CVE-2018-7755

Package Information:
https://launchpad.net/ubuntu/+source/linux-azure/4.15.0-1014.14~16.04.1
https://launchpad.net/ubuntu/+source/linux-hwe/4.15.0-24.26~16.04.1

Original Source

Url : http://www.ubuntu.com/usn/USN-3695-2

CWE : Common Weakness Enumeration

% Id Name
40 % CWE-476 NULL Pointer Dereference
40 % CWE-200 Information Exposure
20 % CWE-119 Failure to Constrain Operations within the Bounds of a Memory Buffer

CPE : Common Platform Enumeration

TypeDescriptionCount
Application 1
Os 5
Os 1
Os 3120
Os 1
Os 1
Os 1

Nessus® Vulnerability Scanner

Date Description
2018-12-28 Name : The remote EulerOS Virtualization host is missing a security update.
File : EulerOS_SA-2018-1407.nasl - Type : ACT_GATHER_INFO
2018-11-21 Name : The remote EulerOS Virtualization host is missing a security update.
File : EulerOS_SA-2018-1373.nasl - Type : ACT_GATHER_INFO
2018-11-16 Name : The remote CentOS host is missing one or more security updates.
File : centos_RHSA-2018-3083.nasl - Type : ACT_GATHER_INFO
2018-10-04 Name : The remote Debian host is missing a security update.
File : debian_DLA-1531.nasl - Type : ACT_GATHER_INFO
2018-10-02 Name : The remote Debian host is missing a security-related update.
File : debian_DSA-4308.nasl - Type : ACT_GATHER_INFO
2018-09-27 Name : The remote EulerOS host is missing multiple security updates.
File : EulerOS_SA-2018-1297.nasl - Type : ACT_GATHER_INFO
2018-09-18 Name : The remote EulerOS Virtualization host is missing multiple security updates.
File : EulerOS_SA-2018-1263.nasl - Type : ACT_GATHER_INFO
2018-08-17 Name : The remote PhotonOS host is missing multiple security updates.
File : PhotonOS_PHSA-2018-1_0-0132.nasl - Type : ACT_GATHER_INFO
2018-07-24 Name : The remote PhotonOS host is missing multiple security updates.
File : PhotonOS_PHSA-2018-2_0-0041.nasl - Type : ACT_GATHER_INFO
2018-07-20 Name : The remote Debian host is missing a security update.
File : debian_DLA-1423.nasl - Type : ACT_GATHER_INFO
2018-07-16 Name : The remote Debian host is missing a security update.
File : debian_DLA-1422.nasl - Type : ACT_GATHER_INFO
2018-06-05 Name : The remote Debian host is missing a security update.
File : debian_DLA-1392.nasl - Type : ACT_GATHER_INFO

Alert History

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0
1
2
Date Informations
2018-08-09 12:08:56
  • Multiple Updates
2018-07-03 05:20:02
  • Multiple Updates
2018-07-03 05:17:45
  • First insertion