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Date: Tue, 26 Jul 2016 17:32:18 -0400 (EDT)
From: cve-assign@...re.org
To: franco.costantini.20@...il.com
Cc: cve-assign@...re.org, oss-security@...ts.openwall.com, gustavo.grieco@...g.fr
Subject: Re: CVE Request: Write out-of-bounds in gdk-pixbuf 2.30.7

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Hash: SHA256

> A write out-of-bounds parsing an ico file was found in gdk-pixbuf 2.30.7.
>  #0  0x00007fffd83b428c in OneLine32 (context=0x7fffe0029820) at io-ico.c:589
>  #1  OneLine (context=0x7fffe0029820) at io-ico.c:800
>  #2  gdk_pixbuf__ico_image_load_increment (data=0x7fffe0029820,
>      buf=0x7fffe001b852 "", size=0, error=0x7fffe9655b68) at io-ico.c:891
> 
> The affected function is here:
> 
>  static void OneLine32 (struct ico_progressive_state *context)
> {
>         gint X;
>         guchar *Pixels;
> 
>         X = 0;
>         if (context->Header.Negative == 0)
>                 Pixels = (context->pixbuf->pixels +
>                           context->pixbuf->rowstride *
>                           (context->Header.height - context->Lines - 1));
>         else
>                 Pixels = (context->pixbuf->pixels +
>                           context->pixbuf->rowstride *
>                           context->Lines);
>         while (X < context->Header.width) {
>                 Pixels[X * 4 + 0] = context->LineBuf[X * 4 + 2];
>                 Pixels[X * 4 + 1] = context->LineBuf[X * 4 + 1];
>                 Pixels[X * 4 + 2] = context->LineBuf[X * 4 + 0];
>                 Pixels[X * 4 + 3] = context->LineBuf[X * 4 + 3];
>                 X++;
>         }
> }
> 
> The value of context->Header.height in OneLine32 is a very large number
> (probably it wasn't validated correctly). Such value is used to calculate
> where to write, resulting in an overflow where Pixels is written.

Use CVE-2016-6352.

- -- 
CVE Assignment Team
M/S M300, 202 Burlington Road, Bedford, MA 01730 USA
[ A PGP key is available for encrypted communications at
  http://cve.mitre.org/cve/request_id.html ]
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