VDB-92242 · CVE-2016-5720 · BID 95859

Microsoft Skype Installer cryptui.dll access control

CVSS Meta Temp Score
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Current Exploit Price (≈)
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CTI Interest Score
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A vulnerability classified as critical was found in Microsoft Skype (Unified Communication Software) (the affected version unknown). This vulnerability affects an unknown part in the library msi.dll/dpapi.dll/cryptui.dll of the component Installer. The manipulation with an unknown input leads to a access control vulnerability. The CWE definition for the vulnerability is CWE-264. As an impact it is known to affect confidentiality, integrity, and availability.

The weakness was disclosed 09/27/2016 as not defined mailinglist post (Full-Disclosure). The advisory is available at seclists.org. The vendor was not involved in the coordination of the public release. This vulnerability was named CVE-2016-5720 since 06/16/2016. The exploitation appears to be easy. Local access is required to approach this attack. A single authentication is necessary for exploitation. Technical details and also a public exploit are known. This vulnerability is assigned to T1068 by the MITRE ATT&CK project.

A public exploit has been developed in Binary and been published immediately after the advisory. It is possible to download the exploit at mega.nz. It is declared as proof-of-concept. As 0-day the estimated underground price was around $5k-$25k. The code used by the exploit is:

1. Download this dll https://mega.nz/#!b4ViSLJL!Pv99pN2d_WxsUHGPH0Ej3onwVeSdh41mpyKfQJfAq8E
2. Copy msi.dll to Downloads directory
3. download skype installer
4. execute the downloaded installer from your "Downloads" directory; Observed behavior: message box “hyhy”

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.






  • free

CPE 2.3info

CPE 2.2info


VulDB Meta Base Score: 7.8
VulDB Meta Temp Score: 7.6

VulDB Base Score: 7.8
VulDB Temp Score: 7.4
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 7.8
NVD Vector: 🔍



VulDB Base Score: 🔍
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VulDB Reliability: 🔍

NVD Base Score: 🔍


Class: Access control
CWE: CWE-264
ATT&CK: T1068

Local: Yes
Remote: No

Availability: 🔍
Access: Public
Status: Proof-of-Concept
Programming Language: 🔍
Download: 🔍

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍


OpenVAS ID: 804587
OpenVAS Name: Microsoft Skype DLL Hijacking Vulnerability
OpenVAS File: 🔍
OpenVAS Family: 🔍

Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍


Recommended: no mitigation known
Status: 🔍

0-Day Time: 🔍
Exploit Delay Time: 🔍


06/16/2016 🔍
09/27/2016 +103 days 🔍
09/27/2016 +0 days 🔍
09/29/2016 +2 days 🔍
01/23/2017 +116 days 🔍
01/27/2017 +4 days 🔍
09/21/2022 +2063 days 🔍


Vendor: microsoft.com

Advisory: seclists.org
Status: Not defined

CVE: CVE-2016-5720 (🔍)
SecurityFocus: 95859 - Skype for Windows CVE-2016-5720 Untrusted Search Path vulnerability

scip Labs: https://www.scip.ch/en/?labs.20140918


Created: 09/29/2016 03:42 PM
Updated: 09/21/2022 02:45 PM
Changes: 09/29/2016 03:42 PM (60), 04/27/2019 06:02 PM (11), 09/21/2022 02:45 PM (3)
Complete: 🔍


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