Executive Summary

Summary
Title Linux kernel (HWE) vulnerability
Informations
NameUSN-4007-2First vendor Publication2019-06-04
VendorUbuntuLast vendor Modification2019-06-04
Severity (Vendor) N/ARevisionN/A

Security-Database Scoring CVSS v2

Cvss vector : (AV:L/AC:M/Au:N/C:P/I:N/A:N)
Cvss Base Score1.9Attack RangeLocal
Cvss Impact Score2.9Attack ComplexityMedium
Cvss Expoit Score3.4AuthenticationNone 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:

A system hardening measure could be bypassed.

Software Description: - linux-aws-hwe: Linux kernel for Amazon Web Services (AWS-HWE) systems - linux-hwe: Linux hardware enablement (HWE) kernel - linux-oracle: Linux kernel for Oracle Cloud systems

Details:

USN-4007-1 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.

Federico Manuel Bento discovered that the Linux kernel did not properly apply Address Space Layout Randomization (ASLR) in some situations for setuid a.out binaries. A local attacker could use this to improve the chances of exploiting an existing vulnerability in a setuid a.out binary.

As a hardening measure, this update disables a.out support.

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-oracle 4.15.0-1014.16~16.04.1
linux-image-4.15.0-1040-aws 4.15.0-1040.42~16.04.1
linux-image-4.15.0-51-generic 4.15.0-51.55~16.04.1
linux-image-4.15.0-51-generic-lpae 4.15.0-51.55~16.04.1
linux-image-4.15.0-51-lowlatency 4.15.0-51.55~16.04.1
linux-image-aws-hwe 4.15.0.1040.40
linux-image-generic-hwe-16.04 4.15.0.51.72
linux-image-generic-lpae-hwe-16.04 4.15.0.51.72
linux-image-lowlatency-hwe-16.04 4.15.0.51.72
linux-image-oem 4.15.0.51.72
linux-image-oracle 4.15.0.1014.8
linux-image-virtual-hwe-16.04 4.15.0.51.72

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/4007-2
https://usn.ubuntu.com/4007-1
CVE-2019-11191

Package Information:
https://launchpad.net/ubuntu/+source/linux-aws-hwe/4.15.0-1040.42~16.04.1
https://launchpad.net/ubuntu/+source/linux-hwe/4.15.0-51.55~16.04.1
https://launchpad.net/ubuntu/+source/linux-oracle/4.15.0-1014.16~16.04.1

Original Source

Url : http://www.ubuntu.com/usn/USN-4007-2

CWE : Common Weakness Enumeration

%idName
100 %CWE-362Race Condition

CPE : Common Platform Enumeration

TypeDescriptionCount
Os3265

Alert History

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0
DateInformations
2019-06-05 05:18:56
  • First insertion