Executive Summary



This Alert is flagged as TOP 25 Common Weakness Enumeration from CWE/SANS. For more information, you can read this.
Summary
Title Linux kernel (HWE) vulnerabilities
Informations
Name USN-3903-2 First vendor Publication 2019-03-06
Vendor Ubuntu Last vendor Modification 2019-03-06
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:L/AC:M/Au:N/C:C/I:C/A:C)
Cvss Base Score 6.9 Attack Range Local
Cvss Impact Score 10 Attack Complexity Medium
Cvss Expoit Score 3.4 Authentication None Required
Calculate full CVSS 2.0 Vectors scores

Detail

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

- Ubuntu 18.04 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-3903-1 fixed vulnerabilities in the Linux kernel for Ubuntu 18.10. This update provides the corresponding updates for the Linux Hardware Enablement (HWE) kernel from Ubuntu 18.10 for Ubuntu 18.04 LTS.

Jason Wang discovered that the vhost net driver in the Linux kernel contained an out of bounds write vulnerability. An attacker in a guest virtual machine could use this to cause a denial of service (host system crash) or possibly execute arbitrary code in the host kernel. (CVE-2018-16880)

Jann Horn discovered that the userfaultd implementation in the Linux kernel did not properly restrict access to certain ioctls. A local attacker could use this possibly to modify files. (CVE-2018-18397)

Jann Horn discovered a race condition in the fork() system call in the Linux kernel. A local attacker could use this to gain access to services that cache authorizations. (CVE-2019-6133)

Update instructions:

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

Ubuntu 18.04 LTS:
linux-image-4.18.0-1013-azure 4.18.0-1013.13~18.04.1
linux-image-4.18.0-16-generic 4.18.0-16.17~18.04.1
linux-image-4.18.0-16-generic-lpae 4.18.0-16.17~18.04.1
linux-image-4.18.0-16-lowlatency 4.18.0-16.17~18.04.1
linux-image-4.18.0-16-snapdragon 4.18.0-16.17~18.04.1
linux-image-azure 4.18.0.1013.12
linux-image-generic-hwe-18.04 4.18.0.16.66
linux-image-generic-lpae-hwe-18.04 4.18.0.16.66
linux-image-lowlatency-hwe-18.04 4.18.0.16.66
linux-image-snapdragon-hwe-18.04 4.18.0.16.66

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-3903-2
https://usn.ubuntu.com/usn/usn-3903-1
CVE-2018-16880, CVE-2018-18397, CVE-2019-6133

Package Information:
https://launchpad.net/ubuntu/+source/linux-azure/4.18.0-1013.13~18.04.1
https://launchpad.net/ubuntu/+source/linux-hwe/4.18.0-16.17~18.04.1

Original Source

Url : http://www.ubuntu.com/usn/USN-3903-2

CWE : Common Weakness Enumeration

% Id Name
50 % CWE-787 Out-of-bounds Write (CWE/SANS Top 25)
50 % CWE-362 Race Condition

CPE : Common Platform Enumeration

TypeDescriptionCount
Application 1
Application 1
Application 1
Os 5
Os 1
Os 3179
Os 2
Os 2
Os 3
Os 3
Os 2
Os 2

Alert History

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0
1
Date Informations
2019-03-06 21:21:46
  • Multiple Updates
2019-03-06 21:18:45
  • First insertion