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First Active2015-08-20
Last Active2015-08-20
Flash Boundless Tunes Universal SOP Bypass Through ActionSctipt's Sound Object
Posted Aug 20, 2015
Authored by Google Security Research, ojakigamon

An instance of ActionScript's Sound class allows for loading and extracting for further processing any kind of external data, not only sound files. Same-origin policy doesn't apply here. Each input byte of raw data, loaded previously from given URL, is encoded by an unspecified function to the same 8 successive sample blocks of output. The sample block consists of 8 bytes (first 4 bytes for left channel and next 4 bytes for right channel). Only 2 bytes from 8 sound blocks (64 bytes) are crucial, the rest 52 bytes are useless. Each byte of input from range 0-255 has corresponding constant unsigned integer value (a result of encoding), so for decoding purposes you can use simply lookup table (cf. source code from BoundlessTunes.as).

tags | exploit
systems | linux
advisories | CVE-2015-5116
SHA-256 | fc4873a13244f4cbc031eca310103bf8bf2dd9f88a4c98659fde47aa2310d88d
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