The problem can be corrected by updating your system to the following package versions: Ubuntu 16.04 ESM: libxmlsec1 1.2.20-2ubuntu4+esm1 xmlsec1 1.2.20-2ubuntu4+esm1 In general, a standard system update will make all the necessary changes.
https://ubuntu.com/security/notices/USN-5674-1
CVE-2017-1000061
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