USN-4040-1 fixed a vulnerability in expat. This update provides the corresponding update for Ubuntu 12.04 ESM and Ubuntu 14.04 ESM.
Original advisory details:
It was discovered that Expat incorrectly handled certain XML files. An attacker could possibly use this issue to cause a denial of service.
{ "availability": "No subscription required", "binaries": [ { "binary_version": "2.1.0-4ubuntu1.4+esm1", "binary_name": "libexpat1-udeb" }, { "binary_version": "2.1.0-4ubuntu1.4+esm1", "binary_name": "expat" }, { "binary_version": "2.1.0-4ubuntu1.4+esm1", "binary_name": "libexpat1-dev" }, { "binary_version": "2.1.0-4ubuntu1.4+esm1", "binary_name": "lib64expat1-dev" }, { "binary_version": "2.1.0-4ubuntu1.4+esm1", "binary_name": "libexpat1" }, { "binary_version": "2.1.0-4ubuntu1.4+esm1", "binary_name": "lib64expat1" } ] }