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 vulnerabilities
Informations
Name USN-4363-1 First vendor Publication 2020-05-18
Vendor Ubuntu Last vendor Modification 2020-05-18
Severity (Vendor) N/A Revision N/A

Security-Database Scoring CVSS v3

Cvss vector : CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Overall CVSS Score 7.8
Base Score 7.8 Environmental Score 7.8
impact SubScore 5.9 Temporal Score 7.8
Exploitabality Sub Score 1.8
 
Attack Vector Local Attack Complexity Low
Privileges Required Low User Interaction None
Scope Unchanged Confidentiality Impact High
Integrity Impact High Availability Impact High
Calculate full CVSS 3.0 Vectors scores

Security-Database Scoring CVSS v2

Cvss vector : (AV:L/AC:L/Au:N/C:P/I:P/A:P)
Cvss Base Score 4.6 Attack Range Local
Cvss Impact Score 6.4 Attack Complexity Low
Cvss Expoit Score 3.9 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 - Ubuntu 16.04 LTS

Summary:

Several security issues were fixed in the Linux kernel.

Software Description: - linux: Linux kernel - linux-aws: Linux kernel for Amazon Web Services (AWS) systems - linux-gke-4.15: Linux kernel for Google Container Engine (GKE) systems - linux-oem: Linux kernel for OEM systems - linux-oracle: Linux kernel for Oracle Cloud systems - linux-snapdragon: Linux kernel for Qualcomm Snapdragon processors - linux-aws-hwe: Linux kernel for Amazon Web Services (AWS-HWE) systems - linux-gcp: Linux kernel for Google Cloud Platform (GCP) systems - linux-hwe: Linux hardware enablement (HWE) kernel

Details:

It was discovered that the Serial CAN interface driver in the Linux kernel did not properly initialize data. A local attacker could use this to expose sensitive information (kernel memory). (CVE-2020-11494)

It was discovered that the linux kernel did not properly validate certain mount options to the tmpfs virtual memory file system. A local attacker with the ability to specify mount options could use this to cause a denial of service (system crash). (CVE-2020-11565)

David Gibson discovered that the Linux kernel on Power9 CPUs did not properly save and restore Authority Mask registers state in some situations. A local attacker in a guest VM could use this to cause a denial of service (host system crash). (CVE-2020-11669)

It was discovered that the block layer in the Linux kernel contained a race condition leading to a use-after-free vulnerability. A local attacker could possibly use this to cause a denial of service (system crash) or execute arbitrary code. (CVE-2020-12657)

Update instructions:

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

Ubuntu 18.04 LTS:
linux-image-4.15.0-101-generic 4.15.0-101.102
linux-image-4.15.0-101-generic-lpae 4.15.0-101.102
linux-image-4.15.0-101-lowlatency 4.15.0-101.102
linux-image-4.15.0-1039-oracle 4.15.0-1039.43
linux-image-4.15.0-1059-gke 4.15.0-1059.62
linux-image-4.15.0-1067-aws 4.15.0-1067.71
linux-image-4.15.0-1079-snapdragon 4.15.0-1079.86
linux-image-4.15.0-1081-oem 4.15.0-1081.91
linux-image-aws-lts-18.04 4.15.0.1067.70
linux-image-generic 4.15.0.101.91
linux-image-generic-lpae 4.15.0.101.91
linux-image-gke 4.15.0.1059.63
linux-image-gke-4.15 4.15.0.1059.63
linux-image-lowlatency 4.15.0.101.91
linux-image-oem 4.15.0.1081.85
linux-image-oracle-lts-18.04 4.15.0.1039.48
linux-image-powerpc-e500mc 4.15.0.101.91
linux-image-powerpc-smp 4.15.0.101.91
linux-image-powerpc64-emb 4.15.0.101.91
linux-image-powerpc64-smp 4.15.0.101.91
linux-image-snapdragon 4.15.0.1079.82
linux-image-virtual 4.15.0.101.91

Ubuntu 16.04 LTS:
linux-image-4.15.0-101-generic 4.15.0-101.102~16.04.1
linux-image-4.15.0-101-generic-lpae 4.15.0-101.102~16.04.1
linux-image-4.15.0-101-lowlatency 4.15.0-101.102~16.04.1
linux-image-4.15.0-1039-oracle 4.15.0-1039.43~16.04.1
linux-image-4.15.0-1067-aws 4.15.0-1067.71~16.04.1
linux-image-4.15.0-1071-gcp 4.15.0-1071.81~16.04.1
linux-image-aws-hwe 4.15.0.1067.67
linux-image-gcp 4.15.0.1071.77
linux-image-generic-hwe-16.04 4.15.0.101.108
linux-image-generic-lpae-hwe-16.04 4.15.0.101.108
linux-image-gke 4.15.0.1071.77
linux-image-lowlatency-hwe-16.04 4.15.0.101.108
linux-image-oem 4.15.0.101.108
linux-image-oracle 4.15.0.1039.32
linux-image-virtual-hwe-16.04 4.15.0.101.108

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/4363-1
CVE-2020-11494, CVE-2020-11565, CVE-2020-11669, CVE-2020-12657

Package Information:
https://launchpad.net/ubuntu/+source/linux/4.15.0-101.102
https://launchpad.net/ubuntu/+source/linux-aws/4.15.0-1067.71
https://launchpad.net/ubuntu/+source/linux-gke-4.15/4.15.0-1059.62
https://launchpad.net/ubuntu/+source/linux-oem/4.15.0-1081.91
https://launchpad.net/ubuntu/+source/linux-oracle/4.15.0-1039.43
https://launchpad.net/ubuntu/+source/linux-snapdragon/4.15.0-1079.86
https://launchpad.net/ubuntu/+source/linux-aws-hwe/4.15.0-1067.71~16.04.1
https://launchpad.net/ubuntu/+source/linux-gcp/4.15.0-1071.81~16.04.1
https://launchpad.net/ubuntu/+source/linux-hwe/4.15.0-101.102~16.04.1
https://launchpad.net/ubuntu/+source/linux-oracle/4.15.0-1039.43~16.04.1

Original Source

Url : http://www.ubuntu.com/usn/USN-4363-1

CWE : Common Weakness Enumeration

% Id Name
33 % CWE-787 Out-of-bounds Write (CWE/SANS Top 25)
33 % CWE-416 Use After Free
33 % CWE-200 Information Exposure

CPE : Common Platform Enumeration

TypeDescriptionCount
Os 4
Os 3331
Os 1
Os 1

Alert History

If you want to see full details history, please login or register.
0
1
Date Informations
2020-05-28 21:28:43
  • Multiple Updates
2020-05-19 05:18:39
  • First insertion