I know many of us in here had this vulnerability, but it is now public and fixed.

Details in first link, and my motorola exploit for it in the second link.

http://blog.cassidiancybersecurity.com/post/2014/06/Android-4.4.3%2C-or-fixing-an-old-local-root

Motorola Exploit:
http://forum.xda-developers.com/moto-x/orig-development/root-4-4-x-pie-motorola-devices-t2771623

Proper SEAndroid policies do block this, Nexus 5, Samsung S4/5/Note3, LG Flex, Sony Z2 devices etc should have this mitigated. Nexus 4 if it hasn't been updated to 4.4.3 nor reset since OTA to 4.4.

Some OEMs have back ported the patch, latest HTC OTAs for m8 fix the bug for sure.
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