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-4367-1 First vendor Publication 2020-05-19
Vendor Ubuntu Last vendor Modification 2020-05-19
Severity (Vendor) N/A Revision N/A

Security-Database Scoring CVSS v3

Cvss vector : CVSS:3.1/AV:L/AC:L/PR:N/UI:R/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 None User Interaction Required
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:N/AC:M/Au:N/C:P/I:P/A:P)
Cvss Base Score 6.8 Attack Range Network
Cvss Impact Score 6.4 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 20.04 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-gcp: Linux kernel for Google Cloud Platform (GCP) systems - linux-kvm: Linux kernel for cloud environments - linux-oracle: Linux kernel for Oracle Cloud systems - linux-riscv: Linux kernel for RISC-V systems

Details:

It was discovered that the btrfs implementation in the Linux kernel did not properly detect that a block was marked dirty in some situations. An attacker could use this to specially craft a file system image that, when unmounted, could cause a denial of service (system crash). (CVE-2019-19377)

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)

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 20.04 LTS:
linux-image-5.4.0-1011-aws 5.4.0-1011.11
linux-image-5.4.0-1011-gcp 5.4.0-1011.11
linux-image-5.4.0-1011-kvm 5.4.0-1011.11
linux-image-5.4.0-1011-oracle 5.4.0-1011.11
linux-image-5.4.0-26-generic 5.4.0-26.30
linux-image-5.4.0-31-generic 5.4.0-31.35
linux-image-5.4.0-31-generic-lpae 5.4.0-31.35
linux-image-5.4.0-31-lowlatency 5.4.0-31.35
linux-image-aws 5.4.0.1011.14
linux-image-gcp 5.4.0.1011.12
linux-image-generic 5.4.0.26.33
linux-image-generic-lpae 5.4.0.31.36
linux-image-gke 5.4.0.1011.12
linux-image-kvm 5.4.0.1011.12
linux-image-lowlatency 5.4.0.31.36
linux-image-oem 5.4.0.31.36
linux-image-oem-osp1 5.4.0.31.36
linux-image-oracle 5.4.0.1011.12
linux-image-virtual 5.4.0.26.33

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/4367-1
CVE-2019-19377, CVE-2020-11565, CVE-2020-12657

Package Information:
https://launchpad.net/ubuntu/+source/linux/5.4.0-31.35
https://launchpad.net/ubuntu/+source/linux-aws/5.4.0-1011.11
https://launchpad.net/ubuntu/+source/linux-gcp/5.4.0-1011.11
https://launchpad.net/ubuntu/+source/linux-kvm/5.4.0-1011.11
https://launchpad.net/ubuntu/+source/linux-oracle/5.4.0-1011.11
https://launchpad.net/ubuntu/+source/linux-riscv/5.4.0-26.30

Original Source

Url : http://www.ubuntu.com/usn/USN-4367-1

CWE : Common Weakness Enumeration

% Id Name
50 % CWE-416 Use After Free
25 % CWE-787 Out-of-bounds Write (CWE/SANS Top 25)
25 % CWE-190 Integer Overflow or Wraparound (CWE/SANS Top 25)

CPE : Common Platform Enumeration

TypeDescriptionCount
Application 1
Os 4
Os 3327
Os 4

Alert History

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0
1
Date Informations
2020-05-23 13:03:46
  • Multiple Updates
2020-05-20 00:18:14
  • First insertion