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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7.6$0-$5k0.00

Summaryinfo

A vulnerability labeled as problematic has been found in Microsoft Skype. The impacted element is an unknown function in the library msi.dll/dpapi.dll/cryptui.dll of the component Installer. Executing a manipulation can lead to access control. This vulnerability is tracked as CVE-2016-5720. The attack is restricted to local execution. Moreover, an exploit is present.

Detailsinfo

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.

The vulnerability is also documented in the vulnerability database at SecurityFocus (BID 95859†). If you want to get best quality of vulnerability data, you may have to visit VulDB.

Productinfo

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CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 7.8
VulDB Meta Temp Score: 7.4

VulDB Base Score: 7.8
VulDB Temp Score: 7.1
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 7.8
NVD Vector: 🔍

CVSSv2info

AVACAuCIA
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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

NVD Base Score: 🔍

Exploitinginfo

Class: Access control
CWE: CWE-264
CAPEC: 🔍
ATT&CK: 🔍

Physical: Partially
Local: Yes
Remote: No

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

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

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

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: no mitigation known
Status: 🔍

0-Day Time: 🔍
Exploit Delay Time: 🔍

Timelineinfo

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 🔍
05/14/2026 +3394 days 🔍

Sourcesinfo

Vendor: microsoft.com

Advisory: seclists.org
Status: Not defined

CVE: CVE-2016-5720 (🔍)
GCVE (CVE): GCVE-0-2016-5720
GCVE (VulDB): GCVE-100-92242
SecurityFocus: 95859 - Skype for Windows CVE-2016-5720 Untrusted Search Path vulnerability

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

Entryinfo

Created: 09/29/2016 15:42
Updated: 05/14/2026 14:51
Changes: 09/29/2016 15:42 (60), 04/27/2019 18:02 (11), 09/21/2022 14:45 (3), 05/14/2026 14:51 (18)
Complete: 🔍
Cache ID: 216::103

If you want to get best quality of vulnerability data, you may have to visit VulDB.

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