[USN-3434-1] Libidn vulnerability

Marc Deslauriers marc.deslauriers at canonical.com
Mon Oct 2 17:54:55 UTC 2017

Ubuntu Security Notice USN-3434-1
October 02, 2017

libidn vulnerability

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

- Ubuntu 17.04
- Ubuntu 16.04 LTS
- Ubuntu 14.04 LTS


Libidn could be made to crash or run programs if it processed specially
crafted input.

Software Description:
- libidn: implementation of IETF IDN specifications


It was discovered that Libidn incorrectly handled decoding certain digits.
A remote attacker could use this issue to cause Libidn to crash, resulting
in a denial of service, or possibly execute arbitrary code.

Update instructions:

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

Ubuntu 17.04:
  libidn11                        1.33-1ubuntu0.1

Ubuntu 16.04 LTS:
  libidn11                        1.32-3ubuntu1.2

Ubuntu 14.04 LTS:
  libidn11                        1.28-1ubuntu2.2

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


Package Information:

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