Category Archives: Ubuntu

Ubuntu Security Notices

Ubuntu

USN-2849-1: Linux kernel (Utopic HWE) vulnerabilities

Ubuntu Security Notice USN-2849-1

19th December, 2015

linux-lts-utopic vulnerabilities

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

  • Ubuntu 14.04 LTS

Summary

Several security issues were fixed in the kernel.

Software description

  • linux-lts-utopic
    – Linux hardware enablement kernel from Utopic

Details

Felix Wilhelm discovered a race condition in the Xen paravirtualized
drivers which can cause double fetch vulnerabilities. An attacker in the
paravirtualized guest could exploit this flaw to cause a denial of service
(crash the host) or potentially execute arbitrary code on the host.
(CVE-2015-8550)

Konrad Rzeszutek Wilk discovered the Xen PCI backend driver does not
perform sanity checks on the device’s state. An attacker could exploit this
flaw to cause a denial of service (NULL dereference) on the host.
(CVE-2015-8551)

Konrad Rzeszutek Wilk discovered the Xen PCI backend driver does not
perform sanity checks on the device’s state. An attacker could exploit this
flaw to cause a denial of service by flooding the logging system with
WARN() messages causing the initial domain to exhaust disk space.
(CVE-2015-8552)

Jann Horn discovered a ptrace issue with user namespaces in the Linux
kernel. The namespace owner could potentially exploit this flaw by ptracing
a root owned process entering the user namespace to elevate its privileges
and potentially gain access outside of the namespace.
(http://bugs.launchpad.net/bugs/1527374)

Update instructions

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

Ubuntu 14.04 LTS:
linux-image-3.16.0-57-generic-lpae

3.16.0-57.77~14.04.1
linux-image-3.16.0-57-lowlatency

3.16.0-57.77~14.04.1
linux-image-3.16.0-57-powerpc-e500mc

3.16.0-57.77~14.04.1
linux-image-3.16.0-57-powerpc64-emb

3.16.0-57.77~14.04.1
linux-image-3.16.0-57-powerpc64-smp

3.16.0-57.77~14.04.1
linux-image-3.16.0-57-generic

3.16.0-57.77~14.04.1
linux-image-3.16.0-57-powerpc-smp

3.16.0-57.77~14.04.1

To update your system, please follow these instructions:
https://wiki.ubuntu.com/Security/Upgrades.

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

CVE-2015-8550,

CVE-2015-8551,

CVE-2015-8552,

CVE-2015-NNN2

Ubuntu

USN-2853-1: Linux kernel (Wily HWE) vulnerabilities

Ubuntu Security Notice USN-2853-1

20th December, 2015

linux-lts-wily vulnerabilities

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

  • Ubuntu 14.04 LTS

Summary

Several security issues were fixed in the kernel.

Software description

  • linux-lts-wily
    – Linux hardware enablement kernel from Wily

Details

Felix Wilhelm discovered a race condition in the Xen paravirtualized
drivers which can cause double fetch vulnerabilities. An attacker in the
paravirtualized guest could exploit this flaw to cause a denial of service
(crash the host) or potentially execute arbitrary code on the host.
(CVE-2015-8550)

Konrad Rzeszutek Wilk discovered the Xen PCI backend driver does not
perform sanity checks on the device’s state. An attacker could exploit this
flaw to cause a denial of service (NULL dereference) on the host.
(CVE-2015-8551)

Konrad Rzeszutek Wilk discovered the Xen PCI backend driver does not
perform sanity checks on the device’s state. An attacker could exploit this
flaw to cause a denial of service by flooding the logging system with
WARN() messages causing the initial domain to exhaust disk space.
(CVE-2015-8552)

Jann Horn discovered a ptrace issue with user namespaces in the Linux
kernel. The namespace owner could potentially exploit this flaw by ptracing
a root owned process entering the user namespace to elevate its privileges
and potentially gain access outside of the namespace.
(http://bugs.launchpad.net/bugs/1527374)

Update instructions

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

Ubuntu 14.04 LTS:
linux-image-4.2.0-22-powerpc64-smp

4.2.0-22.27~14.04.1
linux-image-4.2.0-22-lowlatency

4.2.0-22.27~14.04.1
linux-image-4.2.0-22-generic

4.2.0-22.27~14.04.1
linux-image-4.2.0-22-powerpc-e500mc

4.2.0-22.27~14.04.1
linux-image-4.2.0-22-powerpc-smp

4.2.0-22.27~14.04.1
linux-image-4.2.0-22-powerpc64-emb

4.2.0-22.27~14.04.1
linux-image-4.2.0-22-generic-lpae

4.2.0-22.27~14.04.1

To update your system, please follow these instructions:
https://wiki.ubuntu.com/Security/Upgrades.

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

CVE-2015-8550,

CVE-2015-8551,

CVE-2015-8552,

CVE-2015-NNN2,

http://bugs.launchpad.net/bugs/1527374

Ubuntu

USN-2852-1: Linux kernel (Raspberry Pi 2) vulnerability

Ubuntu Security Notice USN-2852-1

19th December, 2015

linux-raspi2 vulnerability

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

  • Ubuntu 15.10

Summary

The system could be made to provide access outside of namespace sandbox.

Software description

  • linux-raspi2
    – Linux kernel for Raspberry Pi 2

Details

Jann Horn discovered a ptrace issue with user namespaces in the Linux
kernel. The namespace owner could potentially exploit this flaw by ptracing
a root owned process entering the user namespace to elevate its privileges
and potentially gain access outside of the namespace.
(http://bugs.launchpad.net/bugs/1527374)

Update instructions

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

Ubuntu 15.10:
linux-image-4.2.0-1017-raspi2

4.2.0-1017.24

To update your system, please follow these instructions:
https://wiki.ubuntu.com/Security/Upgrades.

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

CVE-2015-NNN2

Ubuntu

USN-2851-1: Linux kernel vulnerabilities

Ubuntu Security Notice USN-2851-1

19th December, 2015

linux vulnerabilities

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

  • Ubuntu 15.10

Summary

Several security issues were fixed in the kernel.

Software description

  • linux
    – Linux kernel

Details

Felix Wilhelm discovered a race condition in the Xen paravirtualized
drivers which can cause double fetch vulnerabilities. An attacker in the
paravirtualized guest could exploit this flaw to cause a denial of service
(crash the host) or potentially execute arbitrary code on the host.
(CVE-2015-8550)

Konrad Rzeszutek Wilk discovered the Xen PCI backend driver does not
perform sanity checks on the device’s state. An attacker could exploit this
flaw to cause a denial of service (NULL dereference) on the host.
(CVE-2015-8551)

Konrad Rzeszutek Wilk discovered the Xen PCI backend driver does not
perform sanity checks on the device’s state. An attacker could exploit this
flaw to cause a denial of service by flooding the logging system with
WARN() messages causing the initial domain to exhaust disk space.
(CVE-2015-8552)

Jann Horn discovered a ptrace issue with user namespaces in the Linux
kernel. The namespace owner could potentially exploit this flaw by ptracing
a root owned process entering the user namespace to elevate its privileges
and potentially gain access outside of the namespace.
(http://bugs.launchpad.net/bugs/1527374)

Update instructions

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

Ubuntu 15.10:
linux-image-4.2.0-22-powerpc64-smp

4.2.0-22.27
linux-image-4.2.0-22-lowlatency

4.2.0-22.27
linux-image-4.2.0-22-generic

4.2.0-22.27
linux-image-4.2.0-22-powerpc-e500mc

4.2.0-22.27
linux-image-4.2.0-22-powerpc-smp

4.2.0-22.27
linux-image-4.2.0-22-powerpc64-emb

4.2.0-22.27
linux-image-4.2.0-22-generic-lpae

4.2.0-22.27

To update your system, please follow these instructions:
https://wiki.ubuntu.com/Security/Upgrades.

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

CVE-2015-8550,

CVE-2015-8551,

CVE-2015-8552,

CVE-2015-NNN2

Ubuntu

USN-2854-1: Linux kernel (Vivid HWE) vulnerabilities

Ubuntu Security Notice USN-2854-1

20th December, 2015

linux-lts-vivid vulnerabilities

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

  • Ubuntu 14.04 LTS

Summary

Several security issues were fixed in the kernel.

Software description

  • linux-lts-vivid
    – Linux hardware enablement kernel from Vivid

Details

Felix Wilhelm discovered a race condition in the Xen paravirtualized
drivers which can cause double fetch vulnerabilities. An attacker in the
paravirtualized guest could exploit this flaw to cause a denial of service
(crash the host) or potentially execute arbitrary code on the host.
(CVE-2015-8550)

Konrad Rzeszutek Wilk discovered the Xen PCI backend driver does not
perform sanity checks on the device’s state. An attacker could exploit this
flaw to cause a denial of service (NULL dereference) on the host.
(CVE-2015-8551)

Konrad Rzeszutek Wilk discovered the Xen PCI backend driver does not
perform sanity checks on the device’s state. An attacker could exploit this
flaw to cause a denial of service by flooding the logging system with
WARN() messages causing the initial domain to exhaust disk space.
(CVE-2015-8552)

Jann Horn discovered a ptrace issue with user namespaces in the Linux
kernel. The namespace owner could potentially exploit this flaw by ptracing
a root owned process entering the user namespace to elevate its privileges
and potentially gain access outside of the namespace.
(http://bugs.launchpad.net/bugs/1527374)

Update instructions

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

Ubuntu 14.04 LTS:
linux-image-3.19.0-42-generic-lpae

3.19.0-42.48~14.04.1
linux-image-3.19.0-42-powerpc64-smp

3.19.0-42.48~14.04.1
linux-image-3.19.0-42-powerpc64-emb

3.19.0-42.48~14.04.1
linux-image-3.19.0-42-generic

3.19.0-42.48~14.04.1
linux-image-3.19.0-42-lowlatency

3.19.0-42.48~14.04.1
linux-image-3.19.0-42-powerpc-smp

3.19.0-42.48~14.04.1
linux-image-3.19.0-42-powerpc-e500mc

3.19.0-42.48~14.04.1

To update your system, please follow these instructions:
https://wiki.ubuntu.com/Security/Upgrades.

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

CVE-2015-8550,

CVE-2015-8551,

CVE-2015-8552,

CVE-2015-NNN2,

http://bugs.launchpad.net/bugs/1527374

Ubuntu

USN-2845-1: SoS vulnerabilities

Ubuntu Security Notice USN-2845-1

17th December, 2015

sosreport vulnerabilities

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

  • Ubuntu 15.10
  • Ubuntu 15.04
  • Ubuntu 14.04 LTS

Summary

sosreport could be made to expose sensitive information or overwrite files
as the administrator.

Software description

  • sosreport
    – Set of tools to gather troubleshooting data from a system

Details

Dolev Farhi discovered an information disclosure issue in SoS. If the
/etc/fstab file contained passwords, the passwords were included in the
SoS report. This issue only affected Ubuntu 14.04 LTS. (CVE-2014-3925)

Mateusz Guzik discovered that SoS incorrectly handled temporary files. A
local attacker could possibly use this issue to overwrite arbitrary files
or gain access to temporary file contents containing sensitive system
information. (CVE-2015-7529)

Update instructions

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

Ubuntu 15.10:
sosreport

3.2-2ubuntu1.1
Ubuntu 15.04:
sosreport

3.2-2ubuntu0.1
Ubuntu 14.04 LTS:
sosreport

3.1-1ubuntu2.2

To update your system, please follow these instructions:
https://wiki.ubuntu.com/Security/Upgrades.

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

References

CVE-2014-3925,

CVE-2015-7529

Ubuntu

USN-2840-1: Linux kernel vulnerabilities

Ubuntu Security Notice USN-2840-1

17th December, 2015

linux vulnerabilities

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

  • Ubuntu 12.04 LTS

Summary

Several security issues were fixed in the kernel.

Software description

  • linux
    – Linux kernel

Details

Dmitry Vyukov discovered that the Linux kernel’s keyring handler attempted
to garbage collect incompletely instantiated keys. A local unprivileged
attacker could use this to cause a denial of service (system crash).
(CVE-2015-7872)

Jan Beulich discovered that the KVM svm hypervisor implementation in the
Linux kernel did not properly catch Debug exceptions on AMD processors. An
attacker in a guest virtual machine could use this to cause a denial of
service (system crash) in the host OS. (CVE-2015-8104)

Update instructions

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

Ubuntu 12.04 LTS:
linux-image-3.2.0-96-generic

3.2.0-96.136
linux-image-3.2.0-96-powerpc-smp

3.2.0-96.136
linux-image-3.2.0-96-virtual

3.2.0-96.136
linux-image-3.2.0-96-highbank

3.2.0-96.136
linux-image-3.2.0-96-omap

3.2.0-96.136
linux-image-3.2.0-96-generic-pae

3.2.0-96.136
linux-image-3.2.0-96-powerpc64-smp

3.2.0-96.136

To update your system, please follow these instructions:
https://wiki.ubuntu.com/Security/Upgrades.

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. If
you use linux-restricted-modules, you have to update that package as
well to get modules which work with the new kernel version. Unless you
manually uninstalled the standard kernel metapackages (e.g. linux-generic,
linux-server, linux-powerpc), a standard system upgrade will automatically
perform this as well.

References

CVE-2015-7872,

CVE-2015-8104

Ubuntu

USN-2842-1: Linux kernel vulnerabilities

Ubuntu Security Notice USN-2842-1

17th December, 2015

linux vulnerabilities

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

  • Ubuntu 15.04

Summary

Several security issues were fixed in the kernel.

Software description

  • linux
    – Linux kernel

Details

Jan Beulich discovered that the KVM svm hypervisor implementation in the
Linux kernel did not properly catch Debug exceptions on AMD processors. An
attacker in a guest virtual machine could use this to cause a denial of
service (system crash) in the host OS. (CVE-2015-8104)

郭永刚 discovered that the ppp implementation in the Linux kernel did
not ensure that certain slot numbers are valid. A local attacker with the
privilege to call ioctl() on /dev/ppp could cause a denial of service
(system crash). (CVE-2015-7799)

It was discovered that the virtual video osd test driver in the Linux
kernel did not properly initialize data structures. A local attacker could
use this to obtain sensitive information from the kernel. (CVE-2015-7884)

It was discovered that the driver for Digi Neo and ClassicBoard devices did
not properly initialize data structures. A local attacker could use this to
obtain sensitive information from the kernel. (CVE-2015-7885)

Update instructions

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

Ubuntu 15.04:
linux-image-3.19.0-41-powerpc64-emb

3.19.0-41.46
linux-image-3.19.0-41-generic

3.19.0-41.46
linux-image-3.19.0-41-powerpc64-smp

3.19.0-41.46
linux-image-3.19.0-41-powerpc-e500mc

3.19.0-41.46
linux-image-3.19.0-41-lowlatency

3.19.0-41.46
linux-image-3.19.0-41-generic-lpae

3.19.0-41.46
linux-image-3.19.0-41-powerpc-smp

3.19.0-41.46

To update your system, please follow these instructions:
https://wiki.ubuntu.com/Security/Upgrades.

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. If
you use linux-restricted-modules, you have to update that package as
well to get modules which work with the new kernel version. Unless you
manually uninstalled the standard kernel metapackages (e.g. linux-generic,
linux-server, linux-powerpc), a standard system upgrade will automatically
perform this as well.

References

CVE-2015-7799,

CVE-2015-7884,

CVE-2015-7885,

CVE-2015-8104

Ubuntu

USN-2841-2: Linux kernel (Trusty HWE) vulnerabilities

Ubuntu Security Notice USN-2841-2

17th December, 2015

linux-lts-trusty vulnerabilities

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

  • Ubuntu 12.04 LTS

Summary

Several security issues were fixed in the kernel.

Software description

  • linux-lts-trusty
    – Linux hardware enablement kernel from Trusty

Details

Jan Beulich discovered that the KVM svm hypervisor implementation in the
Linux kernel did not properly catch Debug exceptions on AMD processors. An
attacker in a guest virtual machine could use this to cause a denial of
service (system crash) in the host OS. (CVE-2015-8104)

郭永刚 discovered that the ppp implementation in the Linux kernel did
not ensure that certain slot numbers are valid. A local attacker with the
privilege to call ioctl() on /dev/ppp could cause a denial of service
(system crash). (CVE-2015-7799)

It was discovered that the driver for Digi Neo and ClassicBoard devices did
not properly initialize data structures. A local attacker could use this to
obtain sensitive information from the kernel. (CVE-2015-7885)

Update instructions

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

Ubuntu 12.04 LTS:
linux-image-3.13.0-73-generic-lpae

3.13.0-73.116~precise1
linux-image-3.13.0-73-generic

3.13.0-73.116~precise1

To update your system, please follow these instructions:
https://wiki.ubuntu.com/Security/Upgrades.

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. If
you use linux-restricted-modules, you have to update that package as
well to get modules which work with the new kernel version. Unless you
manually uninstalled the standard kernel metapackages (e.g. linux-generic,
linux-server, linux-powerpc), a standard system upgrade will automatically
perform this as well.

References

CVE-2015-7799,

CVE-2015-7885,

CVE-2015-8104

Ubuntu

USN-2841-1: Linux kernel vulnerabilities

Ubuntu Security Notice USN-2841-1

17th December, 2015

linux vulnerabilities

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

  • Ubuntu 14.04 LTS

Summary

Several security issues were fixed in the kernel.

Software description

  • linux
    – Linux kernel

Details

Jan Beulich discovered that the KVM svm hypervisor implementation in the
Linux kernel did not properly catch Debug exceptions on AMD processors. An
attacker in a guest virtual machine could use this to cause a denial of
service (system crash) in the host OS. (CVE-2015-8104)

郭永刚 discovered that the ppp implementation in the Linux kernel did
not ensure that certain slot numbers are valid. A local attacker with the
privilege to call ioctl() on /dev/ppp could cause a denial of service
(system crash). (CVE-2015-7799)

It was discovered that the driver for Digi Neo and ClassicBoard devices did
not properly initialize data structures. A local attacker could use this to
obtain sensitive information from the kernel. (CVE-2015-7885)

Update instructions

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

Ubuntu 14.04 LTS:
linux-image-3.13.0-73-powerpc-smp

3.13.0-73.116
linux-image-3.13.0-73-powerpc-e500

3.13.0-73.116
linux-image-3.13.0-73-powerpc64-smp

3.13.0-73.116
linux-image-3.13.0-73-powerpc64-emb

3.13.0-73.116
linux-image-3.13.0-73-powerpc-e500mc

3.13.0-73.116
linux-image-3.13.0-73-generic-lpae

3.13.0-73.116
linux-image-3.13.0-73-lowlatency

3.13.0-73.116
linux-image-3.13.0-73-generic

3.13.0-73.116

To update your system, please follow these instructions:
https://wiki.ubuntu.com/Security/Upgrades.

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. If
you use linux-restricted-modules, you have to update that package as
well to get modules which work with the new kernel version. Unless you
manually uninstalled the standard kernel metapackages (e.g. linux-generic,
linux-server, linux-powerpc), a standard system upgrade will automatically
perform this as well.

References

CVE-2015-7799,

CVE-2015-7885,

CVE-2015-8104