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"Microsoft Windows .Group File - Code Execution"

Author

Exploit author

hyp3rlinx

Platform

Exploit platform

windows

Release date

Exploit published date

2020-01-01

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# Exploit Title: Microsoft Windows .Group File - Code Execution
# Date: 2020-01-01
# Exploit Author: hyp3rlinx
# Vendor Homepage: www.microsoft.com
# Version: 1.9.6
# Tested on: Windows
# CVE : N/A

[+] Credits: John Page (aka hyp3rlinx)		
[+] Website: hyp3rlinx.altervista.org
[+] Source:  http://hyp3rlinx.altervista.org/advisories/MICROSOFT-WINDOWS-.GROUP-FILE-URL-FIELD-CODE-EXECUTION.txt
[+] twitter.com/hyp3rlinx
[+] apparitionsec@gmail
[+] ISR: Apparition Security


[Vendor]
www.microsoft.com


[Product]
Windows ".Group" File Type

Gorup files are a collection of contacts created by Windows Contacts, an embedded contact management program included with Windows.
It contains a list of contacts saved into a group; which can be used to create a mailing list for sending email
messages to multiple addresses at once.


[Vulnerability Type]
URL Field Code Execution


[CVE Reference]
N/A


[Security Issue]
Windows ".group" files are related to Contact files and suffer from unexpected code execution when clicking the "Contact Group Details"
tab Website Go button. This happens if the website URL field points to an executable file. This is the same type of vulnerability
affecting Windows .contact files that remains unfixed as of the time of this writing and has a metasploit module available.

[References]
http://hyp3rlinx.altervista.org/advisories/MICROSOFT-WINDOWS-CONTACT-FILE-INSUFFECIENT-UI-WARNING-WEBSITE-LINK-ARBITRARY-CODE-EXECUTION.txt

Therefore, attacker supplied executables can run unexpected to the user, who thinks they visit a website when click the Website go button.
Moreover, if files are compressed using certain archive utilities it may be possible to skirt security warnings even when the executable is
internet downloaded or copied from network share.

This exploit requires a bit more user interaction than the previously disclosed .contact file vulnerability, as the GROUP file will complain
if not in the Contacts directory. Advisory released for the sake of completeness and user security awareness.


[Exploit/POC]
1) create a Windows .group file

2) create a directory named "http"

3) create an executable file with a .com ext (change .exe to .com) like www.microsoft.com an place it in the "http" dir alongside .group file.

4) point the website URL to the executable using path traversal like "http.\www.microsoft.com" which is the website address in the .group file.

Note: the directory traversal can also point to other dirs like  ..\Downloads\http.\microsoft.com but downside is the URL looks very sketchy.

5) package it up in an archive .rar etc.

6) send the .group file via email, or download it and lure the user to place the archive in the "c:\User\<victim>\Contacts" directory.

7) open the archive and double click the .group file (Windows will complain with an error to move to the contacts folder
   if not within that dir already) next click the website address go button.

The attackers executable will run instead of navigating to a website as would be expected by an end user.


[Severity]
High


[Disclosure Timeline]
Vendor Notification: Same type vuln affecting .contact files disclosed January 16, 2019, status remains unfixed.
January 1, 2020 : 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).

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response = requests.get('http://127.0.0.1:8181/api/v1/exploitdetails/47838/?format=json')

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