Otkrivena su dva sigurnosna propusta programskog paketa FreeType koa se mogu iskoristiti za proizvoljno izvršavanje programskog koda i uskraćivanje usluga.

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Ubuntu Security Notice USN-1267-1
November 18, 2011

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

- Ubuntu 11.10
- Ubuntu 11.04
- Ubuntu 10.10
- Ubuntu 10.04 LTS
- Ubuntu 8.04 LTS

Summary:

FreeType could be made to crash or run programs as your login if it
opened a specially crafted font file.

Software Description:
- freetype: FreeType 2 is a font engine library

Details:

It was discovered that FreeType did not correctly handle certain malformed
Type 1 font files. If a user were tricked into using a specially crafted
font file, a remote attacker could cause FreeType to crash or possibly
execute arbitrary code with user privileges. (CVE-2011-3256)

It was discovered that FreeType did not correctly handle certain malformed
CID-keyed PostScript font files. If a user were tricked into using a specially
crafted font file, a remote attacker could cause FreeType to crash or possibly
execute arbitrary code with user privileges. (CVE-2011-3439)

Update instructions:

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

Ubuntu 11.10:
  libfreetype6                    2.4.4-2ubuntu1.1

Ubuntu 11.04:
  libfreetype6                    2.4.4-1ubuntu2.2

Ubuntu 10.10:
  libfreetype6                    2.4.2-2ubuntu0.3

Ubuntu 10.04 LTS:
  libfreetype6                    2.3.11-1ubuntu2.5

Ubuntu 8.04 LTS:
  libfreetype6                    2.3.5-1ubuntu4.8.04.7

After a standard system update you need to restart your session to make
all the necessary changes.

References:
  http://www.ubuntu.com/usn/usn-1267-1
  CVE-2011-3256, CVE-2011-3439

Package Information:
  https://launchpad.net/ubuntu/+source/freetype/2.4.4-2ubuntu1.1
  https://launchpad.net/ubuntu/+source/freetype/2.4.4-1ubuntu2.2
  https://launchpad.net/ubuntu/+source/freetype/2.4.2-2ubuntu0.3
  https://launchpad.net/ubuntu/+source/freetype/2.3.11-1ubuntu2.5
  https://launchpad.net/ubuntu/+source/freetype/2.3.5-1ubuntu4.8.04.7