http://www.ubuntu.com/usn/usn-2581-1/

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Tavis Ormandy discovered that NetworkManager incorrectly filtered paths
when requested to read modem device contexts. A local attacker could
possibly use this issue to bypass privileges and manipulate modem device
configuration or read arbitrary files.
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This bug is subject to a 90 day disclosure deadline. If 90 days elapse
without a broadly available patch, then the bug report will automatically
become visible to the public.