Ubuntu 16.04 LTS USN-3068-1 Moderate Libidn Denial of Service

ubuntu

August 24, 2016

Several security issues were fixed in Libidn.

Summary

Several security issues were fixed in Libidn.

Software Description:

- libidn: implementation of IETF IDN specifications

Details:

Thijs Alkemade, Gustavo Grieco, Daniel Stenberg, and Nikos

Mavrogiannopoulos discovered that Libidn incorrectly handled invalid UTF-8

characters. A remote attacker could use this issue to cause Libidn to

crash, resulting in a denial of service, or possibly disclose sensitive

memory. This issue only applied to Ubuntu 12.04 LTS and Ubuntu 14.04 LTS.

(CVE-2015-2059)

Hanno Böck discovered that Libidn incorrectly handled certain input. A

remote attacker could possibly use this issue to cause Libidn to crash,

resulting in a denial of service. (CVE-2015-8948, CVE-2016-6262,

CVE-2016-6261, CVE-2016-6263)

Topics Covered

security advisory moderate denial of service security issue ubuntu libidn

Update Instructions

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

Ubuntu 16.04 LTS:
  libidn11                        1.32-3ubuntu1.1

Ubuntu 14.04 LTS:
  libidn11                        1.28-1ubuntu2.1

Ubuntu 12.04 LTS:
  libidn11                        1.23-2ubuntu0.1

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