=========================================================================Ubuntu Security Notice USN-2951-1
April 18, 2016

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

- Ubuntu 15.10
- Ubuntu 14.04 LTS
- Ubuntu 12.04 LTS

Summary:

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

Software Description:
- optipng: advanced PNG (Portable Network Graphics) optimizer

Details:

Gustavo Grieco discovered that OptiPNG incorrectly handled memory. A remote
attacker could use this issue with a specially crafted image file to cause
OptiPNG to crash, resulting in a denial of service. (CVE-2015-7801)

Gustavo Grieco discovered that OptiPNG incorrectly handled memory. A remote
attacker could use this issue with a specially crafted image file to cause
OptiPNG to crash, resulting in a denial of service. (CVE-2015-7802)

Hans Jerry Illikainen discovered that OptiPNG incorrectly handled memory. A
remote attacker could use this issue with a specially crafted image file to
cause OptiPNG to crash, resulting in a denial of service, or possibly
execute arbitrary code. (CVE-2016-2191)

Henri Salo discovered that OptiPNG incorrectly handled memory. A remote
attacker could use this issue with a specially crafted image file to cause
OptiPNG to crash, resulting in a denial of service, or possibly execute
arbitrary code. (CVE-2016-3981)

Henri Salo discovered that OptiPNG incorrectly handled memory. A remote
attacker could use this issue with a specially crafted image file to cause
OptiPNG to crash, resulting in a denial of service, or possibly execute
arbitrary code. (CVE-2016-3982)

Update instructions:

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

Ubuntu 15.10:
  optipng                         0.7.5-1ubuntu0.1

Ubuntu 14.04 LTS:
  optipng                         0.6.4-1ubuntu0.14.04.1

Ubuntu 12.04 LTS:
  optipng                         0.6.4-1ubuntu0.12.04.1

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

References:
  https://ubuntu.com/security/notices/USN-2951-1
  CVE-2015-7801, CVE-2015-7802, CVE-2016-2191, CVE-2016-3981,
  CVE-2016-3982

Package Information:
  https://launchpad.net/ubuntu/+source/optipng/0.7.5-1ubuntu0.1
  https://launchpad.net/ubuntu/+source/optipng/0.6.4-1ubuntu0.14.04.1
  https://launchpad.net/ubuntu/+source/optipng/0.6.4-1ubuntu0.12.04.1