Ubuntu Security Notice USN-2914-1

1st March, 2016

openssl vulnerabilities

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

• Ubuntu 15.10
• Ubuntu 14.04 LTS
• Ubuntu 12.04 LTS

Summary

Several security issues were fixed in OpenSSL.

Software description

• openssl
  – Secure Socket Layer (SSL) cryptographic library and tools

Details

Yuval Yarom, Daniel Genkin, and Nadia Heninger discovered that OpenSSL was
vulnerable to a side-channel attack on modular exponentiation. On certain
CPUs, a local attacker could possibly use this issue to recover RSA keys.
This flaw is known as CacheBleed. (CVE-2016-0702)

Adam Langley discovered that OpenSSL incorrectly handled memory when
parsing DSA private keys. A remote attacker could use this issue to cause
OpenSSL to crash, resulting in a denial of service, or possibly execute
arbitrary code. (CVE-2016-0705)

Guido Vranken discovered that OpenSSL incorrectly handled hex digit
calculation in the BN_hex2bn function. A remote attacker could use this
issue to cause OpenSSL to crash, resulting in a denial of service, or
possibly execute arbitrary code. (CVE-2016-0797)

Emilia Käsper discovered that OpenSSL incorrectly handled memory when
performing SRP user database lookups. A remote attacker could possibly use
this issue to cause OpenSSL to consume memory, resulting in a denial of
service. (CVE-2016-0798)

Guido Vranken discovered that OpenSSL incorrectly handled memory when
printing very long strings. A remote attacker could use this issue to cause
OpenSSL to crash, resulting in a denial of service, or possibly execute
arbitrary code. (CVE-2016-0799)

Update instructions

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

Ubuntu 15.10:

libssl1.0.0

1.0.2d-0ubuntu1.4

Ubuntu 14.04 LTS:

libssl1.0.0

1.0.1f-1ubuntu2.18

Ubuntu 12.04 LTS:

libssl1.0.0

1.0.1-4ubuntu5.35

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.

References

CVE-2016-0702,

CVE-2016-0705,

CVE-2016-0797,

CVE-2016-0798,

CVE-2016-0799

Ubuntu Security Notice USN-2908-5

27th February, 2016

linux-lts-wily regression

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

• Ubuntu 14.04 LTS

Summary

USN-2908-2 introduced a regression in the Ubuntu 15.10 Linux kernel
backported to Ubuntu 14.04 LTS.

Software description

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

Details

USN-2908-2 fixed vulnerabilities in the Ubuntu 15.10 Linux kernel
backported to Ubuntu 14.04 LTS. An incorrect locking fix caused a
regression that broke graphics displays for Ubuntu 14.04 LTS guests
running the Ubuntu 15.10 backport kernel within VMWare virtual
machines. This update fixes the problem.

We apologize for the inconvenience.

Original advisory details:

halfdog discovered that OverlayFS, when mounting on top of a FUSE mount,
incorrectly propagated file attributes, including setuid. A local
unprivileged attacker could use this to gain privileges. (CVE-2016-1576)

halfdog discovered that OverlayFS in the Linux kernel incorrectly
propagated security sensitive extended attributes, such as POSIX ACLs. A
local unprivileged attacker could use this to gain privileges.
(CVE-2016-1575)

It was discovered that the Linux kernel did not properly enforce rlimits
for file descriptors sent over UNIX domain sockets. A local attacker could
use this to cause a denial of service. (CVE-2013-4312)

It was discovered that the Linux kernel’s Filesystem in Userspace (FUSE)
implementation did not handle initial zero length segments properly. A
local attacker could use this to cause a denial of service (unkillable
task). (CVE-2015-8785)

Andy Lutomirski discovered a race condition in the Linux kernel’s
translation lookaside buffer (TLB) handling of flush events. A local
attacker could use this to cause a denial of service or possibly leak
sensitive information. (CVE-2016-2069)

Update instructions

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

Ubuntu 14.04 LTS:

linux-image-4.2.0-30-powerpc-smp

4.2.0-30.36~14.04.1

linux-image-4.2.0-30-powerpc64-smp

4.2.0-30.36~14.04.1

linux-image-4.2.0-30-lowlatency

4.2.0-30.36~14.04.1

linux-image-4.2.0-30-powerpc-e500mc

4.2.0-30.36~14.04.1

linux-image-4.2.0-30-powerpc64-emb

4.2.0-30.36~14.04.1

linux-image-4.2.0-30-generic-lpae

4.2.0-30.36~14.04.1

linux-image-4.2.0-30-generic

4.2.0-30.36~14.04.1

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.

References

LP: 1548587

Ubuntu Security Notice USN-2908-4

26th February, 2016

linux regression

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

• Ubuntu 15.10

Summary

USN-2908-1 introduced a regression in the Linux kernel.

Software description

• linux
  – Linux kernel

Details

USN-2908-1 fixed vulnerabilities in the Linux kernel for Ubuntu
15.10. An incorrect locking fix caused a regression that broke
graphics displays for Ubuntu 15.10 guests running within VMWare
virtual machines. This update fixes the problem.

We apologize for the inconvenience.

Original advisory details:

halfdog discovered that OverlayFS, when mounting on top of a FUSE mount,
incorrectly propagated file attributes, including setuid. A local
unprivileged attacker could use this to gain privileges. (CVE-2016-1576)

halfdog discovered that OverlayFS in the Linux kernel incorrectly
propagated security sensitive extended attributes, such as POSIX ACLs. A
local unprivileged attacker could use this to gain privileges.
(CVE-2016-1575)

It was discovered that the Linux kernel did not properly enforce rlimits
for file descriptors sent over UNIX domain sockets. A local attacker could
use this to cause a denial of service. (CVE-2013-4312)

It was discovered that the Linux kernel’s Filesystem in Userspace (FUSE)
implementation did not handle initial zero length segments properly. A
local attacker could use this to cause a denial of service (unkillable
task). (CVE-2015-8785)

Andy Lutomirski discovered a race condition in the Linux kernel’s
translation lookaside buffer (TLB) handling of flush events. A local
attacker could use this to cause a denial of service or possibly leak
sensitive information. (CVE-2016-2069)

Update instructions

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

Ubuntu 15.10:

linux-image-4.2.0-30-powerpc-smp

4.2.0-30.36

linux-image-4.2.0-30-powerpc64-smp

4.2.0-30.36

linux-image-4.2.0-30-lowlatency

4.2.0-30.36

linux-image-4.2.0-30-powerpc-e500mc

4.2.0-30.36

linux-image-4.2.0-30-powerpc64-emb

4.2.0-30.36

linux-image-4.2.0-30-generic-lpae

4.2.0-30.36

linux-image-4.2.0-30-generic

4.2.0-30.36

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.

References

LP: 1548587

Ubuntu Security Notice USN-2909-2

27th February, 2016

linux-lts-utopic regression

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

• Ubuntu 14.04 LTS

Summary

USN-2909-1 introduced a regression in the Ubuntu 14.10 Linux kernel
backported to Ubuntu 14.04 LTS.

Software description

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

Details

USN-2909-1 fixed vulnerabilities in the Ubuntu 14.10 Linux kernel
backported to Ubuntu 14.04 LTS. An incorrect locking fix caused a
regression that broke graphics displays for Ubuntu 14.04 LTS guests
running the Ubuntu 14.10 backport kernel within VMWare virtual
machines. This update fixes the problem.

We apologize for the inconvenience.

Original advisory details:

halfdog discovered that OverlayFS, when mounting on top of a FUSE mount,
incorrectly propagated file attributes, including setuid. A local
unprivileged attacker could use this to gain privileges. (CVE-2016-1576)

halfdog discovered that OverlayFS in the Linux kernel incorrectly
propagated security sensitive extended attributes, such as POSIX ACLs. A
local unprivileged attacker could use this to gain privileges.
(CVE-2016-1575)

It was discovered that the Linux kernel’s Filesystem in Userspace (FUSE)
implementation did not handle initial zero length segments properly. A
local attacker could use this to cause a denial of service (unkillable
task). (CVE-2015-8785)

Update instructions

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

Ubuntu 14.04 LTS:

linux-image-3.16.0-62-generic-lpae

3.16.0-62.83~14.04.1

linux-image-3.16.0-62-lowlatency

3.16.0-62.83~14.04.1

linux-image-3.16.0-62-powerpc-e500mc

3.16.0-62.83~14.04.1

linux-image-3.16.0-62-powerpc64-emb

3.16.0-62.83~14.04.1

linux-image-3.16.0-62-powerpc64-smp

3.16.0-62.83~14.04.1

linux-image-3.16.0-62-generic

3.16.0-62.83~14.04.1

linux-image-3.16.0-62-powerpc-smp

3.16.0-62.83~14.04.1

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.

References

LP: 1548587

Ubuntu Security Notice USN-2910-2

27th February, 2016

linux-lts-vivid regression

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

• Ubuntu 14.04 LTS

Summary

USN-2910-1 introduced a regression in the Ubuntu 15.04 Linux kernel
backported to Ubuntu 14.04 LTS.

Software description

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

Details

USN-2910-1 fixed vulnerabilities in the Ubuntu 15.04 Linux kernel
backported to Ubuntu 14.04 LTS. An incorrect locking fix caused a
regression that broke graphics displays for Ubuntu 14.04 LTS guests
running the Ubuntu 15.04 backport kernel within VMWare virtual
machines. This update fixes the problem.

We apologize for the inconvenience.

Original advisory details:

halfdog discovered that OverlayFS, when mounting on top of a FUSE mount,
incorrectly propagated file attributes, including setuid. A local
unprivileged attacker could use this to gain privileges. (CVE-2016-1576)

halfdog discovered that OverlayFS in the Linux kernel incorrectly
propagated security sensitive extended attributes, such as POSIX ACLs. A
local unprivileged attacker could use this to gain privileges.
(CVE-2016-1575)

It was discovered that the Linux kernel keyring subsystem contained a race
between read and revoke operations. A local attacker could use this to
cause a denial of service (system crash). (CVE-2015-7550)

郭永刚 discovered that the Linux kernel networking implementation did
not validate protocol identifiers for certain protocol families, A local
attacker could use this to cause a denial of service (system crash) or
possibly gain administrative privileges. (CVE-2015-8543)

Dmitry Vyukov discovered that the pptp implementation in the Linux kernel
did not verify an address length when setting up a socket. A local attacker
could use this to craft an application that exposed sensitive information
from kernel memory. (CVE-2015-8569)

David Miller discovered that the Bluetooth implementation in the Linux
kernel did not properly validate the socket address length for Synchronous
Connection-Oriented (SCO) sockets. A local attacker could use this to
expose sensitive information. (CVE-2015-8575)

It was discovered that the Linux kernel’s Filesystem in Userspace (FUSE)
implementation did not handle initial zero length segments properly. A
local attacker could use this to cause a denial of service (unkillable
task). (CVE-2015-8785)

Update instructions

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

Ubuntu 14.04 LTS:

linux-image-3.19.0-51-generic-lpae

3.19.0-51.58~14.04.1

linux-image-3.19.0-51-lowlatency

3.19.0-51.58~14.04.1

linux-image-3.19.0-51-generic

3.19.0-51.58~14.04.1

linux-image-3.19.0-51-powerpc-e500mc

3.19.0-51.58~14.04.1

linux-image-3.19.0-51-powerpc64-smp

3.19.0-51.58~14.04.1

linux-image-3.19.0-51-powerpc64-emb

3.19.0-51.58~14.04.1

linux-image-3.19.0-51-powerpc-smp

3.19.0-51.58~14.04.1

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.

References

LP: 1548587

Ubuntu Security Notice USN-2913-4

24th February, 2016

gnutls26 update

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

• Ubuntu 14.04 LTS
• Ubuntu 12.04 LTS

Summary

Updated GnuTLS packages are required for the USN-2913-1 update.

Software description

• gnutls26
  – GNU TLS library

Details

USN-2913-1 removed 1024-bit RSA CA certificates from the ca-certificates
package. This update adds support for alternate certificate chains to the
GnuTLS package to properly handle the removal.

Original advisory details:

The ca-certificates package contained outdated CA certificates. This update
refreshes the included certificates to those contained in the 20160104
package, including the removal of the SPI CA and CA certificates with
1024-bit RSA keys.

Update instructions

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

Ubuntu 14.04 LTS:

libgnutls26

2.12.23-12ubuntu2.5

Ubuntu 12.04 LTS:

libgnutls26

2.12.14-5ubuntu3.12

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.

References

LP: 1528645

Ubuntu Security Notice USN-2913-1

24th February, 2016

ca-certificates update

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

• Ubuntu 15.10
• Ubuntu 14.04 LTS
• Ubuntu 12.04 LTS

Summary

ca-certificates was updated to the 20160104 package.

Software description

• ca-certificates
  – Common CA certificates

Details

The ca-certificates package contained outdated CA certificates. This update
refreshes the included certificates to those contained in the 20160104
package, including the removal of the SPI CA and CA certificates with
1024-bit RSA keys.

Update instructions

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

Ubuntu 15.10:

ca-certificates

20160104ubuntu0.15.10.1

Ubuntu 14.04 LTS:

ca-certificates

20160104ubuntu0.14.04.1

Ubuntu 12.04 LTS:

ca-certificates

20160104ubuntu0.12.04.1

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

LP: 1528645

Ubuntu Security Notice USN-2913-2

24th February, 2016

glib-networking update

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

• Ubuntu 15.10
• Ubuntu 14.04 LTS
• Ubuntu 12.04 LTS

Summary

Updated glib-networking packages are required for the USN-2913-1 update.

Software description

• glib-networking
  – network-related giomodules for GLib

Details

USN-2913-1 removed 1024-bit RSA CA certificates from the ca-certificates
package. This update adds support for alternate certificate chains to the
glib-networking package to properly handle the removal.

Original advisory details:

The ca-certificates package contained outdated CA certificates. This update
refreshes the included certificates to those contained in the 20160104
package, including the removal of the SPI CA and CA certificates with
1024-bit RSA keys.

Update instructions

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

Ubuntu 15.10:

glib-networking

2.46.0-1ubuntu0.1

Ubuntu 14.04 LTS:

glib-networking

2.40.0-1ubuntu0.1

Ubuntu 12.04 LTS:

glib-networking

2.32.1-1ubuntu2.1

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

LP: 1528645

Ubuntu Security Notice USN-2913-3

24th February, 2016

openssl update

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

• Ubuntu 14.04 LTS
• Ubuntu 12.04 LTS

Summary

Updated OpenSSL packages are required for the USN-2913-1 update.

Software description

• openssl
  – Secure Socket Layer (SSL) cryptographic library and tools

Details

USN-2913-1 removed 1024-bit RSA CA certificates from the ca-certificates
package. This update adds support for alternate certificate chains to the
OpenSSL package to properly handle the removal.

Original advisory details:

The ca-certificates package contained outdated CA certificates. This update
refreshes the included certificates to those contained in the 20160104
package, including the removal of the SPI CA and CA certificates with
1024-bit RSA keys.

Update instructions

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

Ubuntu 14.04 LTS:

libssl1.0.0

1.0.1f-1ubuntu2.17

Ubuntu 12.04 LTS:

libssl1.0.0

1.0.1-4ubuntu5.34

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.

References

LP: 1528645

Ubuntu Security Notice USN-2912-1

23rd February, 2016

libssh vulnerabilities

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

• Ubuntu 15.10
• Ubuntu 14.04 LTS
• Ubuntu 12.04 LTS

Summary

Several security issues were fixed in libssh.

Software description

• libssh
  – A tiny C SSH library

Details

Mariusz Ziulek discovered that libssh incorrectly handled certain packets.
A remote attacker could possibly use this issue to cause libssh to crash,
resulting in a denial of service.
(CVE-2015-3146)

Aris Adamantiadis discovered that libssh incorrectly generated ephemeral
secret keys of 128 bits instead of the recommended 1024 or 2048 bits when
using the diffie-hellman-group1 and diffie-hellman-group14 methods. If a
remote attacker were able to perform a man-in-the-middle attack, this flaw
could be exploited to view sensitive information. (CVE-2016-0739)

Update instructions

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

Ubuntu 15.10:

libssh-4

0.6.3-3ubuntu3.2

Ubuntu 14.04 LTS:

libssh-4

0.6.1-0ubuntu3.3

Ubuntu 12.04 LTS:

libssh-4

0.5.2-1ubuntu0.12.04.6

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-2015-3146,

CVE-2016-0739