[FFmpeg-devel] [PATCH 2/2] avformat/hls: Be more picky on extensions

[Michael Niedermayer]

On Wed, Jan 22, 2025 at 09:36:09PM +0100, Michael Niedermayer wrote:
> This blocks disallowed extensions from probing
> It also requires all available segments to have matching extensions to the format
> mpegts is treated independent of the extension
> 
> It is recommended to set the whitelists correctly
> instead of depending on extensions, but this should help a bit,
> and this is easier to backport
> 
> Fixes: CVE-2023-6602 II. HLS Force TTY Demuxer
> Fixes: CVE-2023-6602 IV. HLS XBIN Demuxer DoS Amplification
> 
> The other parts of CVE-2023-6602 have been fixed by prior commits
> 
> Found-by: Harvey Phillips of Amazon Element55 (element55)
> Signed-off-by: Michael Niedermayer <michael at niedermayer.cc>
> ---
>  doc/demuxers.texi |  7 +++++++
>  libavformat/hls.c | 50 +++++++++++++++++++++++++++++++++++++++++++++++
>  2 files changed, 57 insertions(+)

I intend to apply this patchset soon so it receives some testing before 7.1.1


[...]
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Michael     GnuPG fingerprint: 9FF2128B147EF6730BADF133611EC787040B0FAB

When the tyrant has disposed of foreign enemies by conquest or treaty, and
there is nothing more to fear from them, then he is always stirring up
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