Category Archives: Ubuntu

Ubuntu

USN-3339-1: OpenVPN vulnerabilities

Ubuntu Security Notice USN-3339-1

22nd June, 2017

openvpn vulnerabilities

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

  • Ubuntu 17.04
  • Ubuntu 16.10
  • Ubuntu 16.04 LTS
  • Ubuntu 14.04 LTS

Summary

Several security issues were fixed in OpenVPN.

Software description

  • openvpn
    – virtual private network software

Details

Karthikeyan Bhargavan and Gaëtan Leurent discovered that 64-bit block
ciphers are vulnerable to a birthday attack. A remote attacker could
possibly use this issue to recover cleartext data. Fixing this issue
requires a configuration change to switch to a different cipher. This
update adds a warning to the log file when a 64-bit block cipher is in use.
This issue only affected Ubuntu 14.04 LTS, Ubuntu 16.04 LTS and
Ubuntu 16.10. (CVE-2016-6329)

It was discovered that OpenVPN incorrectly handled rollover of packet ids.
An authenticated remote attacker could use this issue to cause OpenVPN to
crash, resulting in a denial of service. This issue only affected Ubuntu
14.04 LTS, Ubuntu 16.04 LTS and Ubuntu 16.10. (CVE-2017-7479)

Guido Vranken discovered that OpenVPN incorrectly handled certain malformed
IPv6 packets. A remote attacker could use this issue to cause OpenVPN to
crash, resulting in a denial of service. (CVE-2017-7508)

Guido Vranken discovered that OpenVPN incorrectly handled memory. A remote
attacker could use this issue to cause OpenVPN to crash, resulting in a
denial of service. (CVE-2017-7512)

Guido Vranken discovered that OpenVPN incorrectly handled an HTTP proxy
with NTLM authentication. A remote attacker could use this issue to cause
OpenVPN clients to crash, resulting in a denial of service, or possibly
expose sensitive memory contents. (CVE-2017-7520)

Guido Vranken discovered that OpenVPN incorrectly handled certain x509
extensions. A remote attacker could use this issue to cause OpenVPN to
crash, resulting in a denial of service. (CVE-2017-7521)

Update instructions

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

Ubuntu 17.04:
openvpn

2.4.0-4ubuntu1.3
Ubuntu 16.10:
openvpn

2.3.11-1ubuntu2.1
Ubuntu 16.04 LTS:
openvpn

2.3.10-1ubuntu2.1
Ubuntu 14.04 LTS:
openvpn

2.3.2-7ubuntu3.2

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-2016-6329,

CVE-2017-7479,

CVE-2017-7508,

CVE-2017-7512,

CVE-2017-7520,

CVE-2017-7521

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USN-3337-1: Valgrind vulnerabilities

Ubuntu Security Notice USN-3337-1

21st June, 2017

valgrind vulnerabilities

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

  • Ubuntu 17.04
  • Ubuntu 16.10
  • Ubuntu 16.04 LTS
  • Ubuntu 14.04 LTS

Summary

Valgrind could be made to crash or run programs if it opened a specially
crafted file.

Software description

  • valgrind
    – instrumentation framework for building dynamic analysis tools

Details

It was discovered that Valgrind incorectly handled certain string
operations. If a user or automated system were tricked into processing a
specially crafted binary, a remote attacker could possibly execute
arbitrary code. This issue only affected Ubuntu 14.04 LTS, Ubuntu 16.04
LTS and Ubuntu 16.10. (CVE-2016-2226)

It was discovered that Valgrind incorrectly handled parsing certain
binaries. If a user or automated system were tricked into processing a
specially crafted binary, a remote attacker could use this issue to cause
Valgrind to crash, resulting in a denial of service. (CVE-2016-4487,
CVE-2016-4488, CVE-2016-4489, CVE-2016-4490, CVE-2016-4491, CVE-2016-4492,
CVE-2016-4493, CVE-2016-6131)

Update instructions

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

Ubuntu 17.04:
valgrind

1:3.12.0-1ubuntu1.1
Ubuntu 16.10:
valgrind

1:3.12.0~svn20160714-1ubuntu2.1
Ubuntu 16.04 LTS:
valgrind

1:3.11.0-1ubuntu4.2
Ubuntu 14.04 LTS:
valgrind

1:3.10.1-1ubuntu3~14.5

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-2016-2226,

CVE-2016-4487,

CVE-2016-4488,

CVE-2016-4489,

CVE-2016-4490,

CVE-2016-4491,

CVE-2016-4492,

CVE-2016-4493,

CVE-2016-6131

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USN-3336-1: NSS vulnerability

Ubuntu Security Notice USN-3336-1

21st June, 2017

nss vulnerability

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

  • Ubuntu 17.04
  • Ubuntu 16.10
  • Ubuntu 16.04 LTS
  • Ubuntu 14.04 LTS

Summary

NSS could be made to crash if it received specially crafted network
traffic.

Software description

  • nss
    – Network Security Service library

Details

It was discovered that NSS incorrectly handled certain empty SSLv2
messages. A remote attacker could possibly use this issue to cause NSS to
crash, resulting in a denial of service.

Update instructions

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

Ubuntu 17.04:
libnss3

2:3.28.4-0ubuntu0.17.04.2
Ubuntu 16.10:
libnss3

2:3.28.4-0ubuntu0.16.10.2
Ubuntu 16.04 LTS:
libnss3

2:3.28.4-0ubuntu0.16.04.2
Ubuntu 14.04 LTS:
libnss3

2:3.28.4-0ubuntu0.14.04.2

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

After a standard system update you need to restart any applications
that use NSS, such as Evolution and Chromium, to make all the necessary
changes.

References

CVE-2017-7502

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USN-3335-2: Linux kernel (Trusty HWE) vulnerability

Ubuntu Security Notice USN-3335-2

21st June, 2017

linux-lts-trusty vulnerability

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

  • Ubuntu 12.04 LTS

Summary

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

Software description

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

Details

USN-3335-1 fixed vulnerabilities in the Linux kernel for Ubuntu 14.04
LTS. This update provides the corresponding updates for the Linux
Hardware Enablement (HWE) kernel from Ubuntu 14.04 LTS for Ubuntu
12.04 ESM.

It was discovered that the stack guard page for processes in the Linux
kernel was not sufficiently large enough to prevent overlapping with the
heap. An attacker could leverage this with another vulnerability to execute
arbitrary code and gain administrative privileges

Update instructions

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

Ubuntu 12.04 LTS:
linux-image-3.13.0-121-generic

3.13.0-121.170~precise1
linux-image-generic-lpae-lts-trusty

3.13.0.121.112
linux-image-generic-lts-trusty

3.13.0.121.112
linux-image-3.13.0-121-generic-lpae

3.13.0-121.170~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-2017-1000364

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