full-disclosure - [FD] Skype Insecure Library Loading Vulnerability (api-ms-win-core-winrt-string-l1-1-0.dll)

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Date: Thu, 16 Mar 2017 17:31:31 +0530
From: Sachin Wagh <wsachin092@...il.com>
To: fulldisclosure@...lists.org
Subject: [FD] Skype Insecure Library Loading Vulnerability
	(api-ms-win-core-winrt-string-l1-1-0.dll)

Vulnerability Title: Skype Insecure Library Loading  Vulnerability
(api-ms-win-core-winrt-string-l1-1-0.dll)
Affected Product: Skype
Vendor Homepage: https://www.microsoft.com/en-us/
MSRC Case 32355 TRK:0001002846
CVE-ID : CVE-2017-6517
Severity: Medium

*Description:*

Microsoft Skype contains a DLL hijacking vulnerability that could allow an
unauthenticated attacker to execute arbitrary code on the targeted system.
This vulnerability exists due to some DLL file loaded by ‘Skype.exe’
improperly. And it allows an attacker to load
(api-ms-win-core-winrt-string-l1-1-0.dll)
this DLL file of the attacker’s choosing that could execute arbitrary code
without the user's knowledge.

*Affected Product:*

Skype 7.16.0.102

*Impact:*

Attacker can exploit the vulnerability to load a DLL file of the attacker's
choosing that could execute arbitrary code. This may help attacker to
successful exploits the system if user creates shell as a DLL.

*Proof-Of-Concept :*

1. Create malicious dll file and save it as
'api-ms-win-core-winrt-string-l1-1-0.dll'
in your "Downloads" directory.

2. Download Skype 7.16.0.102 and save it in your "Downloads"
   directory.

3. Execute Skype.exe from your "Downloads" directory.

4. Malicious dll file gets executed.

*Credit:*

*Sachin Wagh (tiger_tigerboy)*

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