Ispravljeno je nekoliko sigurnosnih propusta uočenih u radu paketa OpenJDK 6. Udaljeni zlonamjerni korisnik mogao ih je iskoristiti za pokretanje zlonamjernog programskog koda, DoS napad, pregled osjetljivih podataka i zaobilaženje postavljenih sigurnosnih ograničenja.

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Ubuntu Security Notice USN-1505-1
July 13, 2012

icedtea-web, openjdk-6 vulnerabilities
==========================================================================

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

- Ubuntu 12.04 LTS
- Ubuntu 11.10
- Ubuntu 11.04
- Ubuntu 10.04 LTS

Summary:

Several security issues were fixed in OpenJDK 6.

Software Description:
- openjdk-6: Open Source Java implementation
- icedtea-web: A web browser plugin to execute Java applets

Details:

It was discovered that multiple flaws existed in the CORBA (Common
Object Request Broker Architecture) implementation in OpenJDK. An
attacker could create a Java application or applet that used these
flaws to bypass Java sandbox restrictions or modify immutable object
data. (CVE-2012-1711, CVE-2012-1719)

It was discovered that multiple flaws existed in the OpenJDK font
manager's layout lookup implementation. A attacker could specially
craft a font file that could cause a denial of service through
crashing the JVM (Java Virtual Machine) or possibly execute arbitrary
code. (CVE-2012-1713)

It was discovered that the SynthLookAndFeel class from Swing in
OpenJDK did not properly prevent access to certain UI elements
from outside the current application context. An attacker could
create a Java application or applet that used this flaw to cause a
denial of service through crashing the JVM or bypass Java sandbox
restrictions. (CVE-2012-1716)

It was discovered that OpenJDK runtime library classes could create
temporary files with insecure permissions. A local attacker could
use this to gain access to sensitive information. (CVE-2012-1717)

It was discovered that OpenJDK did not handle CRLs (Certificate
Revocation Lists) properly. A remote attacker could use this to gain
access to sensitive information. (CVE-2012-1718)

It was discovered that the OpenJDK HotSpot Virtual Machine did not
properly verify the bytecode of the class to be executed. A remote
attacker could create a Java application or applet that used this
to cause a denial of service through crashing the JVM or bypass Java
sandbox restrictions. (CVE-2012-1723, CVE-2012-1725)

It was discovered that the OpenJDK XML (Extensible Markup Language)
parser did not properly handle some XML documents. An attacker could
create an XML document that caused a denial of service in a Java
application or applet parsing the document. (CVE-2012-1724)

As part of this update, the IcedTea web browser applet plugin was
updated for Ubuntu 10.04 LTS, Ubuntu 11.04, and Ubuntu 11.10.

Update instructions:

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

Ubuntu 12.04 LTS:
  openjdk-6-jre                   6b24-1.11.3-1ubuntu0.12.04.1

Ubuntu 11.10:
  icedtea-6-plugin                1.2-2ubuntu0.11.10.1
  openjdk-6-jre                   6b24-1.11.3-1ubuntu0.11.10.1

Ubuntu 11.04:
  icedtea-6-plugin                1.2-2ubuntu0.11.04.1
  openjdk-6-jre                   6b24-1.11.3-1ubuntu0.11.04.1

Ubuntu 10.04 LTS:
  icedtea-6-plugin                1.2-2ubuntu0.10.04.1
  openjdk-6-jre                   6b24-1.11.3-1ubuntu0.10.04.1

This update uses a new upstream release, which includes additional
bug fixes. After a standard system update you need to restart any
Java applications or applets to make all the necessary changes.

References:
  http://www.ubuntu.com/usn/usn-1505-1
  CVE-2012-1711, CVE-2012-1713, CVE-2012-1716, CVE-2012-1717,
  CVE-2012-1718, CVE-2012-1719, CVE-2012-1723, CVE-2012-1724,
  CVE-2012-1725

Package Information:
  https://launchpad.net/ubuntu/+source/openjdk-6/6b24-1.11.3-1ubuntu0.12.04.1
  https://launchpad.net/ubuntu/+source/icedtea-web/1.2-2ubuntu0.11.10.1
  https://launchpad.net/ubuntu/+source/openjdk-6/6b24-1.11.3-1ubuntu0.11.10.1
  https://launchpad.net/ubuntu/+source/icedtea-web/1.2-2ubuntu0.11.04.1
  https://launchpad.net/ubuntu/+source/openjdk-6/6b24-1.11.3-1ubuntu0.11.04.1
  https://launchpad.net/ubuntu/+source/icedtea-web/1.2-2ubuntu0.10.04.1
  https://launchpad.net/ubuntu/+source/openjdk-6/6b24-1.11.3-1ubuntu0.10.04.1