Re: CVE request: Mplayer/Mencoder integer overflow parsing gif files

[cve-assign () mitre org]

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> A crash caused by an integer overflow parsing a gif was found in the last
> revision of mplayer. It seems to affect older versions too. It was recently
> fixed (r37857). Technical details and a reproducer are available here:
>
> https://trac.mplayerhq.hu/ticket/2295
>
> I verified that this issue affects mencoder

> > Fixed in r37857.
> >
> > The gif demuxes assumes in many places that width*height is <=
> > INT_MAX; this is not true with the sample. Fixed by validating the
> > picture size.

Use CVE-2016-4352.

This code was added to libmpdemux/demux_gif.c between r37856 and r37857:

   // Validate image size, most code in this demuxer assumes w*h <= INT_MAX
   if ((int64_t)gif->SWidth * gif->SHeight > INT_MAX) {
     mp_msg(MSGT_DEMUX, MSGL_ERR,
            "[demux_gif] Unsupported picture size %dx%d.\n", gif->SWidth,
            gif->SHeight);
     if (DGifCloseFile(gif) == GIF_ERROR)
       print_gif_error(NULL);
     free(priv);
     return NULL;
   }

- -- 
CVE Assignment Team
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