full-disclosure - [FD] Missing Trust Validation in Visual Studio's VSIX Installer

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Message-ID: <5ce22cf256fd4c35a78035b7c50c903c@rubicon.eu>
Date: Wed, 26 Aug 2020 13:37:21 +0000
From: "Ostovary, Daniel" <daniel.ostovary@...icon.eu>
To: "fulldisclosure@...lists.org" <fulldisclosure@...lists.org>
Subject: [FD] Missing Trust Validation in Visual Studio's VSIX Installer

Hi,

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:
https://about.signpath.io/blog/2020/08/26/on-the-importance-of-trust-validation.html

Best regards,
SignPath

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