Date: Thu, 14 Nov 2013 15:11:39 +1100 From: Murray McAllister <mmcallis@...hat.com> To: oss-security@...ts.openwall.com CC: Kurt Seifried <kseifrie@...hat.com>, carnil@...ian.org Subject: CVE request: ppthtml heap-based buffer overflow 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
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