[USN-3212-4] LibTIFF vulnerabilities

[Leonidas S. Barbosa]

==========================================================================
Ubuntu Security Notice USN-3212-4
August 07, 2017

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

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

- Ubuntu 12.04 ESM

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:

USN-3212-1 fixed several issues in LibTIFF. This update
provides a subset of corresponding update for Ubuntu 12.04 ESM.

Mei Wang discovered a multiple integer overflows in LibTIFF which
allows remote attackers to cause a denial of service (crash) or
execute arbitrary code via a crafted TIFF image, which triggers
an out-of-bounds write. (CVE-2016-3945)

It was discovered that LibTIFF is vulnerable to a heap buffer
overflow in the resulting in DoS or code execution
via a crafted BitsPerSample value. (CVE-2017-5225)

Original advisory details:

 It was discovered that LibTIFF incorrectly handled certain malformed
 images. If a user or automated system were tricked into opening a
 specially crafted image, a remote attacker could crash the
 application, leading to a denial of service, or possibly execute
 arbitrary code with user privileges.

Update instructions:

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

Ubuntu 12.04 ESM:
  libtiff-tools                   3.9.5-2ubuntu1.11
  libtiff4                        3.9.5-2ubuntu1.11

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

References:
  https://www.ubuntu.com/usn/usn-3212-4
  https://www.ubuntu.com/usn/usn-3212-1
  CVE-2016-3945, CVE-2017-5225
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