Executive Summary

Summary
Title Linux kernel vulnerability
Informations
NameUSN-4007-1First 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 18.04 LTS

Summary:

A system hardening measure could be bypassed.

Software Description: - linux: Linux kernel - linux-aws: Linux kernel for Amazon Web Services (AWS) systems - linux-gcp: Linux kernel for Google Cloud Platform (GCP) systems - linux-kvm: Linux kernel for cloud environments - linux-meta: - linux-oem: Linux kernel for OEM processors - linux-oracle: Linux kernel for Oracle Cloud systems - linux-raspi2: Linux kernel for Raspberry Pi 2 - linux-snapdragon: Linux kernel for Snapdragon processors

Details:

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 18.04 LTS:
linux-image-4.15.0-1014-oracle 4.15.0-1014.16
linux-image-4.15.0-1033-gcp 4.15.0-1033.35
linux-image-4.15.0-1035-kvm 4.15.0-1035.35
linux-image-4.15.0-1037-raspi2 4.15.0-1037.39
linux-image-4.15.0-1039-oem 4.15.0-1039.44
linux-image-4.15.0-1040-aws 4.15.0-1040.42
linux-image-4.15.0-1054-snapdragon 4.15.0-1054.58
linux-image-4.15.0-51-generic 4.15.0-51.55
linux-image-4.15.0-51-generic-lpae 4.15.0-51.55
linux-image-4.15.0-51-lowlatency 4.15.0-51.55
linux-image-aws 4.15.0.1040.39
linux-image-gcp 4.15.0.1033.35
linux-image-generic 4.15.0.51.53
linux-image-generic-lpae 4.15.0.51.53
linux-image-kvm 4.15.0.1035.35
linux-image-lowlatency 4.15.0.51.53
linux-image-oem 4.15.0.1039.43
linux-image-oracle 4.15.0.1014.17
linux-image-raspi2 4.15.0.1037.35
linux-image-snapdragon 4.15.0.1054.57

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/4007-1
CVE-2019-11191

Package Information:
https://launchpad.net/ubuntu/+source/linux/4.15.0-51.55
https://launchpad.net/ubuntu/+source/linux-aws/4.15.0-1040.42
https://launchpad.net/ubuntu/+source/linux-gcp/4.15.0-1033.35
https://launchpad.net/ubuntu/+source/linux-kvm/4.15.0-1035.35
https://launchpad.net/ubuntu/+source/linux-meta/4.15.0.51.53
https://launchpad.net/ubuntu/+source/linux-oem/4.15.0-1039.44
https://launchpad.net/ubuntu/+source/linux-oracle/4.15.0-1014.16
https://launchpad.net/ubuntu/+source/linux-raspi2/4.15.0-1037.39
https://launchpad.net/ubuntu/+source/linux-snapdragon/4.15.0-1054.58

Original Source

Url : http://www.ubuntu.com/usn/USN-4007-1

CWE : Common Weakness Enumeration

%idName
100 %CWE-362Race Condition

CPE : Common Platform Enumeration

TypeDescriptionCount
Os3037

Alert History

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0
1
DateInformations
2019-06-05 05:21:48
  • Multiple Updates
2019-06-05 05:18:56
  • First insertion