Skype DLL Hijacking

Credit: Sachin Wagh
Risk: Medium
Local: Yes
Remote: No

CVSS Base Score: 10/10
Impact Subscore: 10/10
Exploitability Subscore: 10/10
Exploit range: Remote
Attack complexity: Low
Authentication: No required
Confidentiality impact: Complete
Integrity impact: Complete
Availability impact: Complete

Vulnerability Title: Skype Insecure Library Loading Vulnerability (api-ms-win-core-winrt-string-l1-1-0.dll) Affected Product: Skype Vendor Homepage: 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 aSkype.exea improperly. And it allows an attacker to load (api-ms-win-core-winrt-string-l1-1-0.dll) this DLL file of the attackeras choosing that could execute arbitrary code without the user's knowledge. *Affected Product:* Skype *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 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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