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Ubuntu Security Notice USN-4711-1

Ubuntu Security Notice USN-4711-1
Posted Jan 28, 2021
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 4711-1 - It was discovered that the LIO SCSI target implementation in the Linux kernel performed insufficient identifier checking in certain XCOPY requests. An attacker with access to at least one LUN in a multiple backstore environment could use this to expose sensitive information or modify data. Kiyin discovered that the perf subsystem in the Linux kernel did not properly deallocate memory in some situations. A privileged attacker could use this to cause a denial of service. Various other issues were also addressed.

tags | advisory, denial of service, kernel
systems | linux, ubuntu
advisories | CVE-2020-25704, CVE-2020-28374
SHA-256 | f4ec8d5e13f6ebabd01ab8ec3a0edd91e652d99a1c9951bea7a7b8fc134c23a1

Ubuntu Security Notice USN-4711-1

Change Mirror Download
==========================================================================
Ubuntu Security Notice USN-4711-1
January 28, 2021

linux-aws, linux-kvm, linux-oracle, linux-raspi2, linux-snapdragon
vulnerabilities
==========================================================================

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-aws: Linux kernel for Amazon Web Services (AWS) systems
- linux-kvm: Linux kernel for cloud environments
- linux-oracle: Linux kernel for Oracle Cloud systems
- linux-raspi2: Linux kernel for Raspberry Pi (V8) systems
- linux-snapdragon: Linux kernel for Qualcomm Snapdragon processors

Details:

It was discovered that the LIO SCSI target implementation in the Linux
kernel performed insufficient identifier checking in certain XCOPY
requests. An attacker with access to at least one LUN in a multiple
backstore environment could use this to expose sensitive information or
modify data. (CVE-2020-28374)

Kiyin (尹亮) discovered that the perf subsystem in the Linux kernel did
not properly deallocate memory in some situations. A privileged attacker
could use this to cause a denial of service (kernel memory exhaustion).
(CVE-2020-25704)

Update instructions:

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

Ubuntu 18.04 LTS:
linux-image-4.15.0-1064-oracle 4.15.0-1064.71
linux-image-4.15.0-1078-raspi2 4.15.0-1078.83
linux-image-4.15.0-1084-kvm 4.15.0-1084.86
linux-image-4.15.0-1093-aws 4.15.0-1093.99
linux-image-4.15.0-1095-snapdragon 4.15.0-1095.104
linux-image-aws-lts-18.04 4.15.0.1093.96
linux-image-kvm 4.15.0.1084.80
linux-image-oracle-lts-18.04 4.15.0.1064.74
linux-image-raspi2 4.15.0.1078.75
linux-image-snapdragon 4.15.0.1095.98

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/4711-1
CVE-2020-25704, CVE-2020-28374

Package Information:
https://launchpad.net/ubuntu/+source/linux-aws/4.15.0-1093.99
https://launchpad.net/ubuntu/+source/linux-kvm/4.15.0-1084.86
https://launchpad.net/ubuntu/+source/linux-oracle/4.15.0-1064.71
https://launchpad.net/ubuntu/+source/linux-raspi2/4.15.0-1078.83
https://launchpad.net/ubuntu/+source/linux-snapdragon/4.15.0-1095.104
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