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Ubuntu: Security update for LibTIFF

It was discovered that LibTIFF incorrectly handled certain malformed images using the PixarLog compression format. If a user or automated system were tricked into opening a specially crafted TIFF image, a remote attacker could crash the application, leading to a denial of service, or possibly execute arbitrary code with user privileges. Huzaifa S. Sidhpurwala discovered that the ppm2tiff tool incorrectly handled certain malformed PPM images. If a user or automated system were tricked into opening a specially crafted PPM image, a remote attacker could crash the application, leading to a denial of service, or possibly execute arbitrary code with user privileges.

Updated packages are available from security.ubuntu.com.

==========================================================================
Ubuntu Security Notice USN-1631-1
November 15, 2012

tiff vulnerabilities
==========================================================================

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

- Ubuntu 12.10
- Ubuntu 12.04 LTS
- Ubuntu 11.10
- Ubuntu 10.04 LTS
- Ubuntu 8.04 LTS

Summary:

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

Software Description:
- tiff: Tag Image File Format (TIFF) library

Details:

It was discovered that LibTIFF incorrectly handled certain malformed images
using the PixarLog compression format. If a user or automated system were
tricked into opening a specially crafted TIFF image, a remote attacker
could crash the application, leading to a denial of service, or possibly
execute arbitrary code with user privileges. (CVE-2012-4447)

Huzaifa S. Sidhpurwala discovered that the ppm2tiff tool incorrectly
handled certain malformed PPM images. If a user or automated system were
tricked into opening a specially crafted PPM image, a remote attacker could
crash the application, leading to a denial of service, or possibly execute
arbitrary code with user privileges. (CVE-2012-4564)

Update instructions:

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

Ubuntu 12.10:
 libtiff5                        4.0.2-1ubuntu2.1

Ubuntu 12.04 LTS:
 libtiff4                        3.9.5-2ubuntu1.3

Ubuntu 11.10:
 libtiff4                        3.9.5-1ubuntu1.4

Ubuntu 10.04 LTS:
 libtiff4                        3.9.2-2ubuntu0.11

Ubuntu 8.04 LTS:
 libtiff4                        3.8.2-7ubuntu3.14

In general, a standard system update will make all the necessary changes.

References:
 http://www.ubuntu.com/usn/usn-1631-1
 CVE-2012-4447, CVE-2012-4564

Package Information:
 https://launchpad.net/ubuntu/+source/tiff/4.0.2-1ubuntu2.1
 https://launchpad.net/ubuntu/+source/tiff/3.9.5-2ubuntu1.3
 https://launchpad.net/ubuntu/+source/tiff/3.9.5-1ubuntu1.4
 https://launchpad.net/ubuntu/+source/tiff/3.9.2-2ubuntu0.11
 https://launchpad.net/ubuntu/+source/tiff/3.8.2-7ubuntu3.14
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