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Date: Wed, 26 Aug 2020 13:37:21 +0000
From: "Ostovary, Daniel" <>
To: "" <>
Subject: [FD] Missing Trust Validation in Visual Studio's VSIX Installer


we have recently discovered a vulnerability in the VSIX Installer of Visual Studio. More specifically, the vulnerability existed in the validation of VSIX package signatures. This vulnerability allowed attackers

*        to 'revive' expired code-signing certificates for VSIX package signatures and

*        to maliciously modify timestamps when intercepting timestamp requests for VSIX package signatures.

For more details see here:

Best regards,

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