Ubuntu Security Notice USN-2811-1

16th November, 2015

strongswan vulnerability

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

• Ubuntu 15.10
• Ubuntu 15.04
• Ubuntu 14.04 LTS

Summary

strongSwan could be made to bypass authentication.

Software description

• strongswan
  – IPsec VPN solution

Details

It was discovered that the strongSwan eap-mschapv2 plugin incorrectly
handled state. A remote attacker could use this issue to bypass
authentication.

Update instructions

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

Ubuntu 15.10:

strongswan-plugin-eap-mschapv2

5.1.2-0ubuntu6.2

Ubuntu 15.04:

strongswan-plugin-eap-mschapv2

5.1.2-0ubuntu5.3

Ubuntu 14.04 LTS:

strongswan-plugin-eap-mschapv2

5.1.2-0ubuntu2.4

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-2015-8023

Ubuntu Security Notice USN-2812-1

16th November, 2015

libxml2 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 libxml2.

Software description

• libxml2
  – GNOME XML library

Details

Florian Weimer discovered that libxml2 incorrectly handled certain XML
data. If a user or automated system were tricked into opening a specially
crafted document, an attacker could possibly cause resource consumption,
resulting in a denial of service. This issue only affected
Ubuntu 12.04 LTS, Ubuntu 14.04 LTS and Ubuntu 15.04. (CVE-2015-1819)

Michal Zalewski discovered that libxml2 incorrectly handled certain XML
data. If a user or automated system were tricked into opening a specially
crafted document, an attacker could possibly cause libxml2 to crash,
resulting in a denial of service. This issue only affected
Ubuntu 12.04 LTS, Ubuntu 14.04 LTS and Ubuntu 15.04. (CVE-2015-7941)

Kostya Serebryany discovered that libxml2 incorrectly handled certain XML
data. If a user or automated system were tricked into opening a specially
crafted document, an attacker could possibly cause libxml2 to crash,
resulting in a denial of service, or possibly execute arbitrary code.
(CVE-2015-7942)

Gustavo Grieco discovered that libxml2 incorrectly handled certain XML
data. If a user or automated system were tricked into opening a specially
crafted document, an attacker could possibly cause libxml2 to crash,
resulting in a denial of service. This issue only affected
Ubuntu 14.04 LTS. (CVE-2015-8035)

Update instructions

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

Ubuntu 15.10:

libxml2

2.9.2+zdfsg1-4ubuntu0.1

Ubuntu 15.04:

libxml2

2.9.2+dfsg1-3ubuntu0.1

Ubuntu 14.04 LTS:

libxml2

2.9.1+dfsg1-3ubuntu4.5

Ubuntu 12.04 LTS:

libxml2

2.7.8.dfsg-5.1ubuntu4.12

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

CVE-2015-1819,

CVE-2015-7941,

CVE-2015-7942,

CVE-2015-8035