USN-3434-2: Libidn vulnerability

23 October 2017

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



  • libidn - implementation of IETF IDN specifications


USN-3434-1 fixed a vulnerability in Libidn. This update
provides the corresponding update for Ubuntu 12.04 ESM.

Original advisory details:

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 12.04

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


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