Ubuntu Security Update USN-6190-2: AccountsService vulnerability

[LinuxBot]

USN-6190-1 fixed a vulnerability in AccountsService. This update provides the corresponding update for Ubuntu 14.04 LTS, Ubuntu 16.04 LTS and Ubuntu 18.04 LTS. Original advisory details: Kevin Backhouse discovered that AccountsService incorrectly handled certain D-Bus messages. A local attacker could use this issue to cause AccountsService to crash, resulting in a denial of service, or possibly execute arbitrary code.

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