The following updates has been released for Ubuntu Linux:

USN-4065-2: Squid vulnerabilities
USN-4067-1: Evince vulnerability
USN-4068-1: Linux kernel vulnerabilities
USN-4068-2: Linux kernel (HWE) vulnerabilities

USN-4065-2: Squid vulnerabilities

=========================================================================
Ubuntu Security Notice USN-4065-2
July 22, 2019

squid3 vulnerabilities
=========================================================================
A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 12.04 ESM

Summary:

Several security issues were fixed in Squid.

Software Description:
- squid3: Web proxy cache server

Details:

USN-4065-1 fixed several vulnerabilities in Squid. This update provides
the corresponding update for Ubuntu 12.04 ESM.

Original advisory details:

It was discovered that Squid incorrectly handled Digest authentication. A
remote attacker could possibly use this issue to cause Squid to crash,
resulting in a denial of service. (CVE-2019-12525)

It was discovered that Squid incorrectly handled Basic authentication. A
remote attacker could possibly use this issue to cause Squid to crash,
resulting in a denial of service. (CVE-2019-12529)

Update instructions:

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

Ubuntu 12.04 ESM:
squid3 3.1.19-1ubuntu3.12.04.10

In general, a standard system update will make all the necessary changes.

References:
https://usn.ubuntu.com/4065-2
https://usn.ubuntu.com/4065-1
CVE-2019-12525, CVE-2019-12529

USN-4067-1: Evince vulnerability

=========================================================================
Ubuntu Security Notice USN-4067-1
July 22, 2019

evince vulnerability
=========================================================================
A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 16.04 LTS

Summary:

Evince could be made to crash or run arbitrary code if it received a
specially crafted PDF file.

Software Description:
- evince: Document viewer

Details:

It was discovered that Evince incorrectly handled certain PDF files.
An attacker could possibly use this issue to cause a denial of service
or to execute arbitrary code.

Update instructions:

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

Ubuntu 16.04 LTS:
evince 3.18.2-1ubuntu4.6
evince-common 3.18.2-1ubuntu4.6

In general, a standard system update will make all the necessary changes.

References:
https://usn.ubuntu.com/4067-1
CVE-2019-1010006

Package Information:
https://launchpad.net/ubuntu/+source/evince/3.18.2-1ubuntu4.6

USN-4068-1: Linux kernel vulnerabilities

=========================================================================
Ubuntu Security Notice USN-4068-1
July 23, 2019

linux, linux-aws, linux-gcp, 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: 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-raspi2: Linux kernel for Raspberry Pi 2
- linux-snapdragon: Linux kernel for Snapdragon processors

Details:

Adam Zabrocki discovered that the Intel i915 kernel mode graphics driver in
the Linux kernel did not properly restrict mmap() ranges in some
situations. A local attacker could use this to cause a denial of service
(system crash) or possibly execute arbitrary code. (CVE-2019-11085)

It was discovered that a race condition leading to a use-after-free existed
in the Reliable Datagram Sockets (RDS) protocol implementation in the Linux
kernel. The RDS protocol is blacklisted by default in Ubuntu. If enabled, a
local attacker could use this to cause a denial of service (system crash)
or possibly execute arbitrary code. (CVE-2019-11815)

It was discovered that the ext4 file system implementation in the Linux
kernel did not properly zero out memory in some situations. A local
attacker could use this to expose sensitive information (kernel memory).
(CVE-2019-11833)

It was discovered that the Bluetooth Human Interface Device Protocol (HIDP)
implementation in the Linux kernel did not properly verify strings were
NULL terminated in certain situations. A local attacker could use this to
expose sensitive information (kernel memory). (CVE-2019-11884)

Update instructions:

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

Ubuntu 18.04 LTS:
linux-image-4.15.0-1018-oracle 4.15.0-1018.20
linux-image-4.15.0-1037-gcp 4.15.0-1037.39
linux-image-4.15.0-1039-kvm 4.15.0-1039.39
linux-image-4.15.0-1041-raspi2 4.15.0-1041.44
linux-image-4.15.0-1044-aws 4.15.0-1044.46
linux-image-4.15.0-1058-snapdragon 4.15.0-1058.64
linux-image-4.15.0-55-generic 4.15.0-55.60
linux-image-4.15.0-55-generic-lpae 4.15.0-55.60
linux-image-4.15.0-55-lowlatency 4.15.0-55.60
linux-image-aws 4.15.0.1044.43
linux-image-gcp 4.15.0.1037.39
linux-image-generic 4.15.0.55.57
linux-image-generic-lpae 4.15.0.55.57
linux-image-kvm 4.15.0.1039.39
linux-image-lowlatency 4.15.0.55.57
linux-image-oracle 4.15.0.1018.21
linux-image-powerpc-e500mc 4.15.0.55.57
linux-image-powerpc-smp 4.15.0.55.57
linux-image-powerpc64-emb 4.15.0.55.57
linux-image-powerpc64-smp 4.15.0.55.57
linux-image-raspi2 4.15.0.1041.39
linux-image-snapdragon 4.15.0.1058.61
linux-image-virtual 4.15.0.55.57

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/4068-1
CVE-2019-11085, CVE-2019-11815, CVE-2019-11833, CVE-2019-11884

Package Information:
https://launchpad.net/ubuntu/+source/linux/4.15.0-55.60
https://launchpad.net/ubuntu/+source/linux-aws/4.15.0-1044.46
https://launchpad.net/ubuntu/+source/linux-gcp/4.15.0-1037.39
https://launchpad.net/ubuntu/+source/linux-kvm/4.15.0-1039.39
https://launchpad.net/ubuntu/+source/linux-oracle/4.15.0-1018.20
https://launchpad.net/ubuntu/+source/linux-raspi2/4.15.0-1041.44
https://launchpad.net/ubuntu/+source/linux-snapdragon/4.15.0-1058.64

USN-4068-2: Linux kernel (HWE) vulnerabilities

=========================================================================
Ubuntu Security Notice USN-4068-2
July 23, 2019

linux-hwe, linux-gcp vulnerabilities
=========================================================================
A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 16.04 LTS

Summary:

Several security issues were fixed in the Linux kernel.

Software Description:
- linux-gcp: Linux kernel for Google Cloud Platform (GCP) systems
- linux-hwe: Linux hardware enablement (HWE) kernel

Details:

USN-4068-1 fixed vulnerabilities in the Linux kernel for Ubuntu
18.04 LTS. This update provides the corresponding updates for the
Linux Hardware Enablement (HWE) kernel from Ubuntu 18.04 for Ubuntu
16.04 LTS.

Adam Zabrocki discovered that the Intel i915 kernel mode graphics driver in
the Linux kernel did not properly restrict mmap() ranges in some
situations. A local attacker could use this to cause a denial of service
(system crash) or possibly execute arbitrary code. (CVE-2019-11085)

It was discovered that a race condition leading to a use-after-free existed
in the Reliable Datagram Sockets (RDS) protocol implementation in the Linux
kernel. The RDS protocol is blacklisted by default in Ubuntu. If enabled, a
local attacker could use this to cause a denial of service (system crash)
or possibly execute arbitrary code. (CVE-2019-11815)

It was discovered that the ext4 file system implementation in the Linux
kernel did not properly zero out memory in some situations. A local
attacker could use this to expose sensitive information (kernel memory).
(CVE-2019-11833)

It was discovered that the Bluetooth Human Interface Device Protocol (HIDP)
implementation in the Linux kernel did not properly verify strings were
NULL terminated in certain situations. A local attacker could use this to
expose sensitive information (kernel memory). (CVE-2019-11884)

Update instructions:

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

Ubuntu 16.04 LTS:
linux-image-4.15.0-1037-gcp 4.15.0-1037.39~16.04.1
linux-image-4.15.0-55-generic 4.15.0-55.60~16.04.2
linux-image-4.15.0-55-generic-lpae 4.15.0-55.60~16.04.2
linux-image-4.15.0-55-lowlatency 4.15.0-55.60~16.04.2
linux-image-gcp 4.15.0.1037.51
linux-image-generic-hwe-16.04 4.15.0.55.76
linux-image-generic-lpae-hwe-16.04 4.15.0.55.76
linux-image-gke 4.15.0.1037.51
linux-image-lowlatency-hwe-16.04 4.15.0.55.76
linux-image-oem 4.15.0.55.76
linux-image-virtual-hwe-16.04 4.15.0.55.76

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/4068-2
https://usn.ubuntu.com/4068-1
CVE-2019-11085, CVE-2019-11815, CVE-2019-11833, CVE-2019-11884

Package Information:
https://launchpad.net/ubuntu/+source/linux-gcp/4.15.0-1037.39~16.04.1
https://launchpad.net/ubuntu/+source/linux-hwe/4.15.0-55.60~16.04.2