On TCL Alcatel Cingular Flip 2 B9HUAH1 devices, PIN authentication can be bypassed by creating a special file within the /data/local/tmp/ directory. The System application that implements the lock screen checks for the existence of a specific file and disables PIN authentication if it exists. This file would typically be created via Android Debug Bridge (adb) over USB.
The product exposes a resource to the wrong control sphere, providing unintended actors with inappropriate access to the resource.
Link | Tags |
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https://www.nccgroup.trust/uk/our-research/?research=Technical+advisories | third party advisory |
https://www.nccgroup.trust/us/our-research/technical-advisory-multiple-vulnerabilities-in-alcatel-flip-2/#C | third party advisory exploit |