Follow @Openwall on Twitter for new release announcements and other news
[<prev] [next>] [thread-next>] [day] [month] [year] [list]
Date: Thu, 14 Nov 2013 15:11:39 +1100
From: Murray McAllister <>
CC: Kurt Seifried <>,
Subject: CVE request: ppthtml heap-based buffer overflow


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

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++)


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.)


Murray McAllister / Red Hat Security Response Team

Powered by blists - more mailing lists

Please check out the Open Source Software Security Wiki, which is counterpart to this mailing list.

Confused about mailing lists and their use? Read about mailing lists on Wikipedia and check out these guidelines on proper formatting of your messages.