The problem can be corrected by updating your system to the following package versions: Ubuntu 16.04 ESM: libxdmcp6 1:1.1.2-1.1ubuntu0.1~esm1 Ubuntu 14.04 ESM: libxdmcp6 1:1.1.1-1ubuntu0.1~esm1 In general, a standard system update will make all the necessary changes.
CVE-2017-2625
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