[flac-dev] Two new CVEs against FLAC

Martijn van Beurden mvanb1 at gmail.com
Thu Dec 11 07:52:34 PST 2014

2014-12-11 16:31 GMT+01:00 lvqcl <lvqcl.mail at gmail.com>:
> Martijn van Beurden wrote:
> > For example, it could be checked whether the sample
> > rate, blocksize, number of channels and sample size in the frame
> > header match with those in the stream info, and whether the
> > sample or framenumber is in a sane range. This gives less
> > security than fully decoding the frame, but it ensures the seek
> > process will no longer fail because of these CVE sanity checks.
> IIRC flake encoder is able to create FLAC files with variable blocksizes.
> So it's better to assume that blocksize is not constant.

The STREAMINFO lists a minimum and maximum blocksize used in the stream,
those bounds can be checked for.
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