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computer vulnerability announce CVE-2017-6517

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

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.
Identifiers: CVE-2017-6517, VIGILANCE-VUL-22167.

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.
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