Kod programskog paketa libav uočeno je više sigurnosnih nedostataka koje udaljeni napadač može iskoristiti za pokretanje proizvoljnog programskog koda te napad uskraćivanjem usluga (DoS).

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Ubuntu Security Notice USN-1478-1
June 18, 2012

libav vulnerabilities
==========================================================================

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

- Ubuntu 12.04 LTS
- Ubuntu 11.10
- Ubuntu 11.04

Summary:

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

Software Description:
- libav: Multimedia player, server, encoder and transcoder

Details:

Mateusz Jurczyk and Gynvael Coldwind discovered that Libav incorrectly
handled certain malformed DV files. If a user were tricked into opening a
crafted DV file, an attacker could cause a denial of service via
application crash, or possibly execute arbitrary code with the privileges
of the user invoking the program. This issue only affected Ubuntu 11.10.
(CVE-2011-3929, CVE-2011-3936)

Mateusz Jurczyk and Gynvael Coldwind discovered that Libav incorrectly
handled certain malformed NSV files. If a user were tricked into opening a
crafted NSV file, an attacker could cause a denial of service via
application crash, or possibly execute arbitrary code with the privileges
of the user invoking the program. This issue only affected Ubuntu 11.04 and
Ubuntu 11.10. (CVE-2011-3940)

Mateusz Jurczyk and Gynvael Coldwind discovered that Libav incorrectly
handled certain malformed Kega Game Video (KGV1) files. If a user were
tricked into opening a crafted Kega Game Video (KGV1) file, an attacker
could cause a denial of service via application crash, or possibly execute
arbitrary code with the privileges of the user invoking the program. This
issue only affected Ubuntu 11.04 and Ubuntu 11.10. (CVE-2011-3945)

Mateusz Jurczyk and Gynvael Coldwind discovered that Libav incorrectly
handled certain malformed MJPEG-B files. If a user were tricked into
opening a crafted MJPEG-B file, an attacker could cause a denial of service
via application crash, or possibly execute arbitrary code with the
privileges of the user invoking the program. This issue only affected
Ubuntu 11.04 and Ubuntu 11.10. (CVE-2011-3947)

Mateusz Jurczyk and Gynvael Coldwind discovered that Libav incorrectly
handled certain malformed DPCM files. If a user were tricked into opening a
crafted DPCM file, an attacker could cause a denial of service via
application crash, or possibly execute arbitrary code with the privileges
of the user invoking the program. This issue only affected Ubuntu 11.04 and
Ubuntu 11.10. (CVE-2011-3951)

Mateusz Jurczyk and Gynvael Coldwind discovered that Libav incorrectly
handled certain malformed KMVC files. If a user were tricked into opening a
crafted KMVC file, an attacker could cause a denial of service via
application crash, or possibly execute arbitrary code with the privileges
of the user invoking the program. This issue only affected Ubuntu 11.04 and
Ubuntu 11.10. (CVE-2011-3952)

Jeong Wook Oh discovered that Libav incorrectly handled certain malformed
ASF files. If a user were tricked into opening a crafted ASF file, an
attacker could cause a denial of service via application crash, or possibly
execute arbitrary code with the privileges of the user invoking the
program. This issue only affected Ubuntu 11.10. (CVE-2011-4031)

It was discovered that Libav incorrectly handled certain malformed
Westwood SNDx files. If a user were tricked into opening a crafted Westwood
SNDx file, an attacker could cause a denial of service via application
crash, or possibly execute arbitrary code with the privileges of the user
invoking the program. This issue only affected Ubuntu 11.10.
(CVE-2012-0848)

Diana Elena Muscalu discovered that Libav incorrectly handled certain
malformed AAC files. If a user were tricked into opening a crafted AAC
file, an attacker could cause a denial of service via application crash, or
possibly execute arbitrary code with the privileges of the user invoking
the program. This issue only affected Ubuntu 11.04 and Ubuntu 11.10.
(CVE-2012-0850)

It was discovered that Libav incorrectly handled certain malformed H.264
files. If a user were tricked into opening a crafted H.264 file, an
attacker could cause a denial of service via application crash, or possibly
execute arbitrary code with the privileges of the user invoking the
program. (CVE-2012-0851)

It was discovered that Libav incorrectly handled certain malformed ADPCM
files. If a user were tricked into opening a crafted ADPCM file, an
attacker could cause a denial of service via application crash, or possibly
execute arbitrary code with the privileges of the user invoking the
program. This issue only affected Ubuntu 11.04 and Ubuntu 11.10.
(CVE-2012-0852)

It was discovered that Libav incorrectly handled certain malformed Atrac 3
files. If a user were tricked into opening a crafted Atrac 3 file, an
attacker could cause a denial of service via application crash, or possibly
execute arbitrary code with the privileges of the user invoking the
program. This issue only affected Ubuntu 11.04 and Ubuntu 11.10.
(CVE-2012-0853)

It was discovered that Libav incorrectly handled certain malformed Shorten
files. If a user were tricked into opening a crafted Shorten file, an
attacker could cause a denial of service via application crash, or possibly
execute arbitrary code with the privileges of the user invoking the
program. This issue only affected Ubuntu 11.04 and Ubuntu 11.10.
(CVE-2012-0858)

It was discovered that Libav incorrectly handled certain malformed Vorbis
files. If a user were tricked into opening a crafted Vorbis file, an
attacker could cause a denial of service via application crash, or possibly
execute arbitrary code with the privileges of the user invoking the
program. This issue only affected Ubuntu 11.04 and Ubuntu 11.10.
(CVE-2012-0859)

Fabian Yamaguchi discovered that Libav incorrectly handled certain
malformed VQA files. If a user were tricked into opening a crafted VQA
file, an attacker could cause a denial of service via application crash, or
possibly execute arbitrary code with the privileges of the user invoking
the program. (CVE-2012-0947)

Update instructions:

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

Ubuntu 12.04 LTS:
  libavcodec53                    4:0.8.3-0ubuntu0.12.04.1
  libavformat53                   4:0.8.3-0ubuntu0.12.04.1

Ubuntu 11.10:
  libavcodec53                    4:0.7.6-0ubuntu0.11.10.1
  libavformat53                   4:0.7.6-0ubuntu0.11.10.1

Ubuntu 11.04:
  libavcodec52                    4:0.6.6-0ubuntu0.11.04.1
  libavformat52                   4:0.6.6-0ubuntu0.11.04.1

This update uses a new upstream release, which includes additional bug
fixes. In general, a standard system update will make all the necessary
changes.

References:
  http://www.ubuntu.com/usn/usn-1478-1
  CVE-2011-3929, CVE-2011-3936, CVE-2011-3940, CVE-2011-3945,
  CVE-2011-3947, CVE-2011-3951, CVE-2011-3952, CVE-2011-4031,
  CVE-2012-0848, CVE-2012-0850, CVE-2012-0851, CVE-2012-0852,
  CVE-2012-0853, CVE-2012-0858, CVE-2012-0859, CVE-2012-0947

Package Information:
  https://launchpad.net/ubuntu/+source/libav/4:0.8.3-0ubuntu0.12.04.1
  https://launchpad.net/ubuntu/+source/libav/4:0.7.6-0ubuntu0.11.10.1
  https://launchpad.net/ubuntu/+source/libav/4:0.6.6-0ubuntu0.11.04.1