Category Archives: Ubuntu

Ubuntu Security Notices

Ubuntu

USN-2856-1: ldb vulnerabilities

Ubuntu Security Notice USN-2856-1

5th January, 2016

ldb vulnerabilities

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

  • Ubuntu 15.10
  • Ubuntu 15.04
  • Ubuntu 14.04 LTS
  • Ubuntu 12.04 LTS

Summary

Several security issues were fixed in ldb.

Software description

  • ldb
    – LDAP-like embedded database

Details

Thilo Uttendorfer discovered that the ldb incorrectly handled certain zero
values. A remote attacker could use this issue to cause applications using
ldb, such as Samba, to stop responding, resulting in a denial of service.
(CVE-2015-3223)

Douglas Bagnall discovered that ldb incorrectly handled certain string
lengths. A remote attacker could use this issue to possibly access
sensitive information from memory of applications using ldb, such as Samba.
(CVE-2015-5330)

Update instructions

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

Ubuntu 15.10:
libldb1

2:1.1.20-2ubuntu0.1
Ubuntu 15.04:
libldb1

1:1.1.18-1ubuntu0.1
Ubuntu 14.04 LTS:
libldb1

1:1.1.16-1ubuntu0.1
Ubuntu 12.04 LTS:
libldb1

1:1.1.4-1ubuntu0.1

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

After a standard system update you need to restart applications using ldb,
such as Samba, to make all the necessary changes.

References

CVE-2015-3223,

CVE-2015-5330

Ubuntu

USN-2855-1: Samba vulnerabilities

Ubuntu Security Notice USN-2855-1

5th January, 2016

samba vulnerabilities

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

  • Ubuntu 15.10
  • Ubuntu 15.04
  • Ubuntu 14.04 LTS
  • Ubuntu 12.04 LTS

Summary

Several security issues were fixed in Samba.

Software description

  • samba
    – SMB/CIFS file, print, and login server for Unix

Details

Thilo Uttendorfer discovered that the Samba LDAP server incorrectly handled
certain packets. A remote attacker could use this issue to cause the LDAP
server to stop responding, resulting in a denial of service. This issue
only affected Ubuntu 14.04 LTS, Ubuntu 15.04 and Ubuntu 15.10.
(CVE-2015-3223)

Jan Kasprzak discovered that Samba incorrectly handled certain symlinks. A
remote attacker could use this issue to access files outside the exported
share path. (CVE-2015-5252)

Stefan Metzmacher discovered that Samba did not enforce signing when
creating encrypted connections. If a remote attacker were able to perform a
man-in-the-middle attack, this flaw could be exploited to view sensitive
information. (CVE-2015-5296)

It was discovered that Samba incorrectly performed access control when
using the VFS shadow_copy2 module. A remote attacker could use this issue
to access snapshots, contrary to intended permissions. (CVE-2015-5299)

Douglas Bagnall discovered that Samba incorrectly handled certain string
lengths. A remote attacker could use this issue to possibly access
sensitive information. (CVE-2015-5330)

It was discovered that the Samba LDAP server incorrectly handled certain
packets. A remote attacker could use this issue to cause the LDAP server to
stop responding, resulting in a denial of service. This issue only affected
Ubuntu 14.04 LTS, Ubuntu 15.04 and Ubuntu 15.10. (CVE-2015-7540)

Andrew Bartlett discovered that Samba incorrectly checked administrative
privileges during creation of machine accounts. A remote attacker could
possibly use this issue to bypass intended access restrictions in certain
environments. This issue only affected Ubuntu 14.04 LTS, Ubuntu 15.04 and
Ubuntu 15.10. (CVE-2015-8467)

Update instructions

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

Ubuntu 15.10:
samba

2:4.1.17+dfsg-4ubuntu3.1
Ubuntu 15.04:
samba

2:4.1.13+dfsg-4ubuntu3.1
Ubuntu 14.04 LTS:
samba

2:4.1.6+dfsg-1ubuntu2.14.04.11
Ubuntu 12.04 LTS:
samba

2:3.6.3-2ubuntu2.13

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-2015-3223,

CVE-2015-5252,

CVE-2015-5296,

CVE-2015-5299,

CVE-2015-5330,

CVE-2015-7540,

CVE-2015-8467

Ubuntu

USN-2858-1: Linux kernel vulnerability

Ubuntu Security Notice USN-2858-1

5th January, 2016

linux vulnerability

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

  • Ubuntu 15.10

Summary

The system could be made to run programs as an administrator.

Software description

  • linux
    – Linux kernel

Details

Nathan Williams discovered that overlayfs in the Linux kernel incorrectly
handled setattr operations. A local unprivileged attacker could use this to
create files with administrative permission attributes and execute
arbitrary code with elevated privileges.

Update instructions

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

Ubuntu 15.10:
linux-image-4.2.0-23-powerpc64-emb

4.2.0-23.28
linux-image-4.2.0-23-lowlatency

4.2.0-23.28
linux-image-4.2.0-23-powerpc64-smp

4.2.0-23.28
linux-image-4.2.0-23-generic

4.2.0-23.28
linux-image-4.2.0-23-powerpc-smp

4.2.0-23.28
linux-image-4.2.0-23-generic-lpae

4.2.0-23.28
linux-image-4.2.0-23-powerpc-e500mc

4.2.0-23.28

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-2015-8660

Ubuntu

USN-2857-2: Linux kernel (Vivid HWE) vulnerability

Ubuntu Security Notice USN-2857-2

5th January, 2016

linux-lts-vivid vulnerability

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

  • Ubuntu 14.04 LTS

Summary

The system could be made to run programs as an administrator.

Software description

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

Details

Nathan Williams discovered that overlayfs in the Linux kernel incorrectly
handled setattr operations. A local unprivileged attacker could use this to
create files with administrative permission attributes and execute
arbitrary code with elevated privileges.

Update instructions

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

Ubuntu 14.04 LTS:
linux-image-3.19.0-43-powerpc64-emb

3.19.0-43.49~14.04.1
linux-image-3.19.0-43-lowlatency

3.19.0-43.49~14.04.1
linux-image-3.19.0-43-powerpc64-smp

3.19.0-43.49~14.04.1
linux-image-3.19.0-43-generic-lpae

3.19.0-43.49~14.04.1
linux-image-3.19.0-43-powerpc-smp

3.19.0-43.49~14.04.1
linux-image-3.19.0-43-generic

3.19.0-43.49~14.04.1
linux-image-3.19.0-43-powerpc-e500mc

3.19.0-43.49~14.04.1

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-2015-8660

Ubuntu

USN-2858-3: Linux kernel (Raspberry Pi 2) vulnerability

Ubuntu Security Notice USN-2858-3

5th January, 2016

linux-raspi2 vulnerability

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

  • Ubuntu 15.10

Summary

The system could be made to run programs as an administrator.

Software description

  • linux-raspi2
    – Linux kernel for Raspberry Pi 2

Details

Nathan Williams discovered that overlayfs in the Linux kernel incorrectly
handled setattr operations. A local unprivileged attacker could use this to
create files with administrative permission attributes and execute
arbitrary code with elevated privileges.

Update instructions

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

Ubuntu 15.10:
linux-image-4.2.0-1018-raspi2

4.2.0-1018.25

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-2015-8660

Ubuntu

USN-2858-2: Linux kernel (Wily HWE) vulnerability

Ubuntu Security Notice USN-2858-2

5th January, 2016

linux-lts-wily vulnerability

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

  • Ubuntu 14.04 LTS

Summary

The system could be made to run programs as an administrator.

Software description

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

Details

Nathan Williams discovered that overlayfs in the Linux kernel incorrectly
handled setattr operations. A local unprivileged attacker could use this to
create files with administrative permission attributes and execute
arbitrary code with elevated privileges.

Update instructions

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

Ubuntu 14.04 LTS:
linux-image-4.2.0-23-powerpc64-emb

4.2.0-23.28~14.04.1
linux-image-4.2.0-23-lowlatency

4.2.0-23.28~14.04.1
linux-image-4.2.0-23-powerpc64-smp

4.2.0-23.28~14.04.1
linux-image-4.2.0-23-generic

4.2.0-23.28~14.04.1
linux-image-4.2.0-23-powerpc-smp

4.2.0-23.28~14.04.1
linux-image-4.2.0-23-generic-lpae

4.2.0-23.28~14.04.1
linux-image-4.2.0-23-powerpc-e500mc

4.2.0-23.28~14.04.1

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-2015-8660

Ubuntu

USN-2847-1: Linux kernel (Trusty HWE) vulnerabilities

Ubuntu Security Notice USN-2847-1

19th 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

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 12.04 LTS:
linux-image-3.13.0-74-generic

3.13.0-74.118~precise1
linux-image-3.13.0-74-generic-lpae

3.13.0-74.118~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.
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-2846-1: Linux kernel vulnerabilities

Ubuntu Security Notice USN-2846-1

19th 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

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)

Update instructions

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

Ubuntu 12.04 LTS:
linux-image-3.2.0-97-highbank

3.2.0-97.137
linux-image-3.2.0-97-omap

3.2.0-97.137
linux-image-3.2.0-97-generic-pae

3.2.0-97.137
linux-image-3.2.0-97-powerpc64-smp

3.2.0-97.137
linux-image-3.2.0-97-virtual

3.2.0-97.137
linux-image-3.2.0-97-generic

3.2.0-97.137
linux-image-3.2.0-97-powerpc-smp

3.2.0-97.137

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

Ubuntu

USN-2848-1: Linux kernel vulnerabilities

Ubuntu Security Notice USN-2848-1

19th 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

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-3.13.0-74-powerpc64-emb

3.13.0-74.118
linux-image-3.13.0-74-lowlatency

3.13.0-74.118
linux-image-3.13.0-74-generic

3.13.0-74.118
linux-image-3.13.0-74-generic-lpae

3.13.0-74.118
linux-image-3.13.0-74-powerpc-e500mc

3.13.0-74.118
linux-image-3.13.0-74-powerpc-e500

3.13.0-74.118
linux-image-3.13.0-74-powerpc64-smp

3.13.0-74.118
linux-image-3.13.0-74-powerpc-smp

3.13.0-74.118

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-2850-1: Linux kernel vulnerabilities

Ubuntu Security Notice USN-2850-1

19th 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

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 15.04:
linux-image-3.19.0-42-generic-lpae

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

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

3.19.0-42.48
linux-image-3.19.0-42-generic

3.19.0-42.48
linux-image-3.19.0-42-lowlatency

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

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

3.19.0-42.48

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