0patch Released a Micropatch for Recently Revealed Windows Contacts (Vcard ) RCE Zero-day Flaw

Security researcher recently revealed PoC for Windows Vcard RCE Zero-day vulnerability after it crossed the 90 days patch deadline.

Now 0patch released a micropatch for this zero day flow for fully updated 64-bit Windows 10 version 1803 and fully updated 64-bit Windows 7

Zero-day vulnerability that exists in the VCard files (.vcf) allows remote attackers to execute arbitrary code on vulnerable systems.

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In this case, User interaction is required to exploit this vulnerability in that the target must visit a malicious page or open a malicious file.

John Page, a Security researcher who discovered this RCE vulnerability said, “The specific flaw exists within the processing of VCard files. Crafted data in a VCard file can cause Windows to display a dangerous hyperlink. The user interface fails to provide any indication of the hazard.”

Micropatch From 0patch

Since the Microsoft failed to fix the issue within 90 days, he released Proof-of-concept that help to exploit this vulnerability in affected windows system.

According to 0patch, “The issue is in the fact that almost any string provided via a VCF or CONTACT file in the web site URL or email value (yes, we figured this one out ourselves 🙂 ends up being used as an argument to a ShellExecute call. While ShellExecute is a handy function for opening URLs in user’s default browser”

Mitja Kolsek, Co-founder of 0patch, explained and demonstrate the video about to enable the micropatch while Windows Contacts is displaying the malicious contact card, and the result of clicking on the link gets changed.

0patch is working to provide micropatch for unpatched zero-day flows in softwares and operating systems.

Its unclear that when Microsoft releases a patch for this zero-day flow but the user can apply this Micropatch until Microsoft fixed and released an update. Once they released then the Micro patch will be automatically stopped.

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