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Re: CVE request: ppthtml heap-based buffer overflow
From: Kurt Seifried <kseifried () redhat com>
Date: Wed, 13 Nov 2013 21:28:32 -0700

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On 11/13/2013 09:11 PM, Murray McAllister wrote:
Morning,

A heap-based buffer overflow flaw was reported in ppthtml:

http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=729279

Looking in xlhtml-0.5-15.fc19.src.rpm, I think the root cause of
the problem is in __OLEdecode() with an under allocation here:

163   BDepot = (U8 *) malloc (0x0200 * (num_bbd_blocks +
num_xbbd_blocks));

That still passes this check:

167   assert (num_bbd_blocks <=  (0x0200 / 4 - 1) * num_xbbd_blocks
+ 168                              (0x0200 / 4) - 19);

I suspect the overflow eventually occurs in this loop:

184   for (i = 0; i < num_xbbd_blocks; i++)

with:

203       fread (s, 0x0200, 1, input); 204       test_exitf
(!ferror (input), 5, ends ()); 205       s += 0x0200;

continually executed (but haven't tested thoroughly!!!).

Can a CVE please be assigned?

(Cc'ing Salvatore in case there is more information in the Debian
report that I cannot see.)

Cheers,

-- Murray McAllister / Red Hat Security Response Team

Now this, this is a CVE request. Please use CVE-2013-4565 for this issue.

- -- 
Kurt Seifried Red Hat Security Response Team (SRT)
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