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Vigil@nce - Microsoft Skype: executing DLL code via api-ms-win-core-winrt-string-l1-1-0.dll

May 2017 by Vigil@nce

This bulletin was written by Vigil@nce : https://vigilance.fr/offer

SYNTHESIS OF THE VULNERABILITY

An attacker can create a malicious api-ms-win-core-winrt-string-l1-1-0.dll DLL, and then put it in the current directory of Microsoft Skype, in order to execute code.

Impacted products: Skype for Business.

Severity: 2/4.

Creation date: 17/03/2017.

DESCRIPTION OF THE VULNERABILITY

The Microsoft Skype product uses external shared libraries (DLL).

However, if the working directory contains a malicious api-ms-win-core-winrt-string-l1-1-0.dll DLL, it is automatically loaded.

An attacker can therefore create a malicious api-ms-win-core-winrt-string-l1-1-0.dll DLL, and then put it in the current directory of Microsoft Skype, in order to execute code.

ACCESS TO THE COMPLETE VIGIL@NCE BULLETIN

https://vigilance.fr/vulnerability/...




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