Ubuntu Security Update USN-5638-4: Expat vulnerabilities

[LinuxBot]

USN-5638-1 fixed several vulnerabilities in Expat. This update provides the corresponding update for Ubuntu 14.04 ESM. Original advisory details: Rhodri James discovered that Expat incorrectly handled memory when processing certain malformed XML files. An attacker could possibly use this issue to cause a crash or execute arbitrary code.

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