Executive Summary

Summary
Title Linux kernel (HWE) vulnerabilities
Informations
NameUSN-3980-2First vendor Publication2019-05-14
VendorUbuntuLast vendor Modification2019-05-14
Severity (Vendor) N/ARevisionN/A

Security-Database Scoring CVSS v2

Cvss vector : (AV:A/AC:L/Au:S/C:P/I:P/A:C)
Cvss Base Score6.7Attack RangeAdjacent network
Cvss Impact Score8.5Attack ComplexityLow
Cvss Expoit Score5.1AuthenticationRequires single instance
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-azure: Linux kernel for Microsoft Azure Cloud systems - linux-hwe: Linux hardware enablement (HWE) kernel

Details:

USN-3980-1 fixed vulnerabilities in the Linux kernel for Ubuntu 18.10. This update provides the corresponding updates for the Linux Hardware Enablement (HWE) kernel from Ubuntu 18.10 for Ubuntu 18.04 LTS.

Ke Sun, Henrique Kawakami, Kekai Hu, Rodrigo Branco, Giorgi Maisuradze, Dan Horea Lutas, Andrei Lutas, Volodymyr Pikhur, Stephan van Schaik, Alyssa Milburn, Sebastian Österlund, Pietro Frigo, Kaveh Razavi, Herbert Bos, Cristiano Giuffrida, Moritz Lipp, Michael Schwarz, and Daniel Gruss discovered that memory previously stored in microarchitectural fill buffers of an Intel CPU core may be exposed to a malicious process that is executing on the same CPU core. A local attacker could use this to expose sensitive information. (CVE-2018-12130)

Brandon Falk, Ke Sun, Henrique Kawakami, Kekai Hu, Rodrigo Branco, Stephan van Schaik, Alyssa Milburn, Sebastian Österlund, Pietro Frigo, Kaveh Razavi, Herbert Bos, and Cristiano Giuffrida discovered that memory previously stored in microarchitectural load ports of an Intel CPU core may be exposed to a malicious process that is executing on the same CPU core. A local attacker could use this to expose sensitive information. (CVE-2018-12127)

Ke Sun, Henrique Kawakami, Kekai Hu, Rodrigo Branco, Marina Minkin, Daniel Moghimi, Moritz Lipp, Michael Schwarz, Jo Van Bulck, Daniel Genkin, Daniel Gruss, Berk Sunar, Frank Piessens, and Yuval Yarom discovered that memory previously stored in microarchitectural store buffers of an Intel CPU core may be exposed to a malicious process that is executing on the same CPU core. A local attacker could use this to expose sensitive information. (CVE-2018-12126)

Vasily Averin and Evgenii Shatokhin discovered that a use-after-free vulnerability existed in the NFS41+ subsystem when multiple network namespaces are in use. A local attacker in a container could use this to cause a denial of service (system crash) or possibly execute arbitrary code. (CVE-2018-16884)

Ke Sun, Henrique Kawakami, Kekai Hu, Rodrigo Branco, Volodrmyr Pikhur, Moritz Lipp, Michael Schwarz, Daniel Gruss, Stephan van Schaik, Alyssa Milburn, Sebastian Österlund, Pietro Frigo, Kaveh Razavi, Herbert Bos, and Cristiano Giuffrida discovered that uncacheable memory previously stored in microarchitectural buffers of an Intel CPU core may be exposed to a malicious process that is executing on the same CPU core. A local attacker could use this to expose sensitive information. (CVE-2019-11091)

Matteo Croce, Natale Vinto, and Andrea Spagnolo discovered that the cgroups subsystem of the Linux kernel did not properly account for SCTP socket buffers. A local attacker could use this to cause a denial of service (system crash). (CVE-2019-3874)

Alex Williamson discovered that the vfio subsystem of the Linux kernel did not properly limit DMA mappings. A local attacker could use this to cause a denial of service (memory exhaustion). (CVE-2019-3882)

Marc Orr discovered that the KVM hypervisor implementation in the Linux kernel did not properly restrict APIC MSR register values when nested virtualization is used. An attacker in a guest vm could use this to cause a denial of service (host OS crash). (CVE-2019-3887)

Hugues Anguelkov discovered that the Broadcom Wifi driver in the Linux kernel contained a heap buffer overflow. A physically proximate attacker could use this to cause a denial of service (system crash) or possibly execute arbitrary code. (CVE-2019-9500)

Hugues Anguelkov discovered that the Broadcom Wifi driver in the Linux kernel did not properly prevent remote firmware events from being processed for USB Wifi devices. A physically proximate attacker could use this to send firmware events to the device. (CVE-2019-9503)

Update instructions:

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

Ubuntu 18.04 LTS:
linux-image-4.18.0-1018-azure 4.18.0-1018.18~18.04.1
linux-image-4.18.0-20-generic 4.18.0-20.21~18.04.1
linux-image-4.18.0-20-generic-lpae 4.18.0-20.21~18.04.1
linux-image-4.18.0-20-lowlatency 4.18.0-20.21~18.04.1
linux-image-4.18.0-20-snapdragon 4.18.0-20.21~18.04.1
linux-image-azure 4.18.0.1018.17
linux-image-generic-hwe-18.04 4.18.0.20.70
linux-image-generic-lpae-hwe-18.04 4.18.0.20.70
linux-image-lowlatency-hwe-18.04 4.18.0.20.70
linux-image-snapdragon-hwe-18.04 4.18.0.20.70
linux-image-virtual-hwe-18.04 4.18.0.20.70

After a standard system update you need to reboot your computer to make all the necessary changes.

Please note that fully mitigating the Microarchitectural Data Sampling (MDS) issues (CVE-2018-12126, CVE-2018-12127, CVE-2018-12130, and CVE-2019-11091) requires corresponding processor microcode/firmware updates or, in virtual environments, hypervisor updates.

References:
https://usn.ubuntu.com/usn/usn-3980-2
https://usn.ubuntu.com/usn/usn-3980-1
CVE-2018-12126, CVE-2018-12127, CVE-2018-12130,
CVE-2018-16884, CVE-2019-11091, CVE-2019-3874,
CVE-2019-3882, CVE-2019-3887, CVE-2019-9500, CVE-2019-9503,
https://wiki.ubuntu.com/SecurityTeam/KnowledgeBase/MDS

Package Information:
https://launchpad.net/ubuntu/+source/linux-azure/4.18.0-1018.18~18.04.1
https://launchpad.net/ubuntu/+source/linux-hwe/4.18.0-20.21~18.04.1

Original Source

Url : http://www.ubuntu.com/usn/USN-3980-2

CWE : Common Weakness Enumeration

%idName
50 %CWE-200Information Exposure
12 %CWE-416Use After Free
12 %CWE-400Uncontrolled Resource Consumption ('Resource Exhaustion')
12 %CWE-119Failure to Constrain Operations within the Bounds of a Memory Buffer
12 %CWE-20Improper Input Validation

CPE : Common Platform Enumeration

TypeDescriptionCount
Application1
Hardware1
Hardware1
Hardware1
Hardware1
Os2
Os1
Os2
Os1
Os1
Os1
Os1
Os321
Os1

Nessus® Vulnerability Scanner

DateDescription
2019-01-11Name : The remote Virtuozzo host is missing a security update.
File : Virtuozzo_VZA-2018-089.nasl - Type : ACT_GATHER_INFO

Alert History

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0
1
DateInformations
2019-05-31 12:12:32
  • Multiple Updates
2019-05-15 05:18:48
  • First insertion