icu - security update

Several vulnerabilities were discovered in the International Components
for Unicode (ICU) library.

• CVE-2014-8146
  The Unicode Bidirectional Algorithm implementation does not properly
  track directionally isolated pieces of text, which allows remote
  attackers to cause a denial of service (heap-based buffer overflow)
  or possibly execute arbitrary code via crafted text.
• CVE-2014-8147
  The Unicode Bidirectional Algorithm implementation uses an integer
  data type that is inconsistent with a header file, which allows
  remote attackers to cause a denial of service (incorrect malloc
  followed by invalid free) or possibly execute arbitrary code via
  crafted text.
• CVE-2015-4760
  The Layout Engine was missing multiple boundary checks. These could
  lead to buffer overflows and memory corruption. A specially crafted
  file could cause an application using ICU to parse untrusted font
  files to crash and, possibly, execute arbitrary code.

Additionally, it was discovered that the patch applied to ICU in DSA-3187-1
for CVE-2014-6585 was incomplete, possibly leading to an invalid memory
access. This could allow remote attackers to disclose portion of private
memory via crafted font files.

For the oldstable distribution (wheezy), these problems have been fixed
in version 4.8.1.1-12+deb7u3.

For the stable distribution (jessie), these problems have been fixed in
version 52.1-8+deb8u2.

For the testing distribution (stretch), these problems have been fixed
in version 52.1-10.

For the unstable distribution (sid), these problems have been fixed in
version 52.1-10.

We recommend that you upgrade your icu packages.