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LG liblg_parser_mkv.so Bad Allocation Calls

LG liblg_parser_mkv.so Bad Allocation Calls
Posted May 9, 2017
Authored by Google Security Research, Mark Brand

During EBML node parsing the EBML element_size is used unvalidated to allocate a stack buffer to store the element contents. Since calls to alloca simply compile to a subtraction from the current stack pointer, for large sizes this can result in memory corruption and potential remote-code-execution in the mediaserver process. Tested on an LG-G4 with firmware MRA58K.

tags | exploit, remote
SHA-256 | fead583452cca3b0aff0b1e5d1c60e83a1131d969e79b214c620dd57f7a19180
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