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-3931-1 First vendor Publication 2019-04-02
Vendor Ubuntu Last vendor Modification 2019-04-02
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:N/AC:L/Au:N/C:N/I:N/A:C)
Cvss Base Score 7.8 Attack Range Network
Cvss Impact Score 6.9 Attack Complexity Low
Cvss Expoit Score 10 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: 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-oem: Linux kernel for OEM processors - linux-oracle: Linux kernel for Oracle Cloud systems - linux-raspi2: Linux kernel for Raspberry Pi 2

Details:

M. Vefa Bicakci and Andy Lutomirski discovered that the kernel did not properly set up all arguments to an error handler callback used when running as a paravirtualized guest. An unprivileged attacker in a paravirtualized guest VM could use this to cause a denial of service (guest VM crash). (CVE-2018-14678)

It was discovered that the KVM implementation in the Linux kernel on ARM 64bit processors did not properly handle some ioctls. An attacker with the privilege to create KVM-based virtual machines could use this to cause a denial of service (host system crash) or execute arbitrary code in the host. (CVE-2018-18021)

Mathias Payer and Hui Peng discovered a use-after-free vulnerability in the Advanced Linux Sound Architecture (ALSA) subsystem. A physically proximate attacker could use this to cause a denial of service (system crash). (CVE-2018-19824)

Shlomi Oberman, Yuli Shapiro, and Ran Menscher discovered an information leak in the Bluetooth implementation of the Linux kernel. An attacker within Bluetooth range could use this to expose sensitive information (kernel memory). (CVE-2019-3459, CVE-2019-3460)

Jann Horn discovered that the KVM implementation in the Linux kernel contained a use-after-free vulnerability. An attacker in a guest VM with access to /dev/kvm could use this to cause a denial of service (guest VM crash). (CVE-2019-6974)

Jim Mattson and Felix Wilhelm discovered a use-after-free vulnerability in the KVM subsystem of the Linux kernel, when using nested virtual machines. A local attacker in a guest VM could use this to cause a denial of service (system crash) or possibly execute arbitrary code in the host system. (CVE-2019-7221)

Felix Wilhelm discovered that an information leak vulnerability existed in the KVM subsystem of the Linux kernel, when nested virtualization is used. A local attacker could use this to expose sensitive information (host system memory to a guest VM). (CVE-2019-7222)

Jann Horn discovered that the eBPF implementation in the Linux kernel was insufficiently hardened against Spectre V1 attacks. A local attacker could use this to expose sensitive information. (CVE-2019-7308)

It was discovered that a use-after-free vulnerability existed in the user- space API for crypto (af_alg) implementation in the Linux kernel. A local attacker could use this to cause a denial of service (system crash) or possibly execute arbitrary code. (CVE-2019-8912)

It was discovered that the Linux kernel did not properly deallocate memory when handling certain errors while reading files. A local attacker could use this to cause a denial of service (excessive memory consumption). (CVE-2019-8980)

Jann Horn discovered that the mmap implementation in the Linux kernel did not properly check for the mmap minimum address in some situations. A local attacker could use this to assist exploiting a kernel NULL pointer dereference vulnerability. (CVE-2019-9213)

Update instructions:

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

Ubuntu 18.04 LTS:
linux-image-4.15.0-1010-oracle 4.15.0-1010.12
linux-image-4.15.0-1029-gcp 4.15.0-1029.31
linux-image-4.15.0-1031-kvm 4.15.0-1031.31
linux-image-4.15.0-1033-raspi2 4.15.0-1033.35
linux-image-4.15.0-1035-aws 4.15.0-1035.37
linux-image-4.15.0-1035-oem 4.15.0-1035.40
linux-image-4.15.0-47-generic 4.15.0-47.50
linux-image-4.15.0-47-generic-lpae 4.15.0-47.50
linux-image-4.15.0-47-lowlatency 4.15.0-47.50
linux-image-4.15.0-47-snapdragon 4.15.0-47.50
linux-image-aws 4.15.0.1035.34
linux-image-gcp 4.15.0.1029.31
linux-image-generic 4.15.0.47.49
linux-image-generic-lpae 4.15.0.47.49
linux-image-gke 4.15.0.1029.31
linux-image-kvm 4.15.0.1031.31
linux-image-lowlatency 4.15.0.47.49
linux-image-oem 4.15.0.1035.40
linux-image-oracle 4.15.0.1010.13
linux-image-raspi2 4.15.0.1033.31
linux-image-snapdragon 4.15.0.47.49
linux-image-virtual 4.15.0.47.49

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-3931-1
CVE-2018-14678, CVE-2018-18021, CVE-2018-19824, CVE-2019-3459,
CVE-2019-3460, CVE-2019-6974, CVE-2019-7221, CVE-2019-7222,
CVE-2019-7308, CVE-2019-8912, CVE-2019-8980, CVE-2019-9213

Package Information:
https://launchpad.net/ubuntu/+source/linux/4.15.0-47.50
https://launchpad.net/ubuntu/+source/linux-aws/4.15.0-1035.37
https://launchpad.net/ubuntu/+source/linux-gcp/4.15.0-1029.31
https://launchpad.net/ubuntu/+source/linux-kvm/4.15.0-1031.31
https://launchpad.net/ubuntu/+source/linux-oem/4.15.0-1035.40
https://launchpad.net/ubuntu/+source/linux-oracle/4.15.0-1010.12
https://launchpad.net/ubuntu/+source/linux-raspi2/4.15.0-1033.35

Original Source

Url : http://www.ubuntu.com/usn/USN-3931-1

CWE : Common Weakness Enumeration

% Id Name
27 % CWE-416 Use After Free
18 % CWE-200 Information Exposure
9 % CWE-665 Improper Initialization
9 % CWE-476 NULL Pointer Dereference
9 % CWE-401 Failure to Release Memory Before Removing Last Reference ('Memory Leak')
9 % CWE-362 Race Condition
9 % CWE-189 Numeric Errors (CWE/SANS Top 25)
9 % CWE-20 Improper Input Validation

CPE : Common Platform Enumeration

TypeDescriptionCount
Application 91
Application 82
Application 84
Application 77
Application 102
Application 80
Application 73
Application 96
Application 93
Application 97
Application 82
Application 90
Application 1
Application 1
Application 1
Application 17
Hardware 7
Hardware 6
Os 7
Os 2
Os 2
Os