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USN-3434-1: Libidn vulnerability

2 October 2017

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



  • 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
Ubuntu 16.04
Ubuntu 14.04

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


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