Microsoft Windows Vista SP2 up to Server 2012 R2 Print Spooler ntprint.dll PSetupDownloadAndInstallLegacyDriver 7pk security

CVSS Meta Temp Score
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CTI Interest Score
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8.6$0-$5k0.00

A vulnerability was found in Microsoft Windows Vista SP2 up to Server 2012 R2 (Operating System). It has been declared as very critical. Affected by this vulnerability is the function PSetupDownloadAndInstallLegacyDriver in the library ntprint.dll of the component Print Spooler. The manipulation with an unknown input leads to a 7pk security vulnerability. The CWE definition for the vulnerability is CWE-254. As an impact it is known to affect confidentiality, integrity, and availability.

The weakness was published 07/12/2016 as MS16-087 as confirmed bulletin (Technet). It is possible to read the advisory at technet.microsoft.com. This vulnerability is known as CVE-2016-3238 since 03/15/2016. The attack can be launched remotely. The exploitation doesn't need any form of authentication. Technical details and also a public exploit are known. The pricing for an exploit might be around USD $0-$5k at the moment (estimation calculated on 09/01/2022). The attack technique deployed by this issue is T1211 according to MITRE ATT&CK. The advisory points out:

A remote code execution vulnerability exists when the Windows Print Spooler service does not properly validate print drivers while installing a printer from servers. An attacker who successfully exploited this vulnerability could use it to execute arbitrary code and take control of an affected system. An attacker could then install programs; view, change, or delete data; or create new accounts with full user rights. Users whose accounts are configured to have fewer user rights on the system could be less impacted than users who operate with administrative user rights.

It is possible to download the exploit at blog.vectranetworks.com. It is declared as proof-of-concept. We expect the 0-day to have been worth approximately $100k and more. The vulnerability scanner Nessus provides a plugin with the ID 92018 (MS16-087: Security Update for Windows Print Spooler (3170005)), which helps to determine the existence of the flaw in a target environment. It is assigned to the family Windows : Microsoft Bulletins. The commercial vulnerability scanner Qualys is able to test this issue with plugin 91408 (Microsoft Windows Security Update September 2017). The advisory illustrates:

To exploit this vulnerability, an attacker must be able to execute a man-in-the-middle (MiTM) attack on a workstation or print server, or set up a rogue print server on a target network. The update addresses the vulnerability by issuing a warning to users who attempt to install untrusted printer drivers.

Applying the patch MS16-087 is able to eliminate this problem. The bugfix is ready for download at technet.microsoft.com. A possible mitigation has been published immediately after the disclosure of the vulnerability.

The vulnerability is also documented in the databases at Tenable (92018) and SecurityFocus (BID 91609†). Similar entries are available at VDB-89036, VDB-106482, VDB-106454 and VDB-106472.

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CVSSv3info

VulDB Meta Base Score: 9.1
VulDB Meta Temp Score: 8.6

VulDB Base Score: 10.0
VulDB Temp Score: 9.0
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NVD Base Score: 8.1
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Exploitinginfo

Class: 7pk security
CWE: CWE-254
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Local: No
Remote: Yes

Availability: 🔍
Access: Public
Status: Proof-of-Concept
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Nessus ID: 92018
Nessus Name: MS16-087: Security Update for Windows Print Spooler (3170005)
Nessus File: 🔍
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OpenVAS ID: 802074
OpenVAS Name: Microsoft Windows Print Spooler Components Multiple Vulnerabilities (3170005)
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Countermeasuresinfo

Recommended: Patch
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Patch: MS16-087

Timelineinfo

03/15/2016 🔍
07/12/2016 +119 days 🔍
07/12/2016 +0 days 🔍
07/12/2016 +0 days 🔍
07/12/2016 +0 days 🔍
07/13/2016 +1 days 🔍
09/01/2022 +2241 days 🔍

Sourcesinfo

Vendor: microsoft.com
Product: microsoft.com

Advisory: MS16-087
Status: Confirmed

CVE: CVE-2016-3238 (🔍)
SecurityFocus: 91609 - Microsoft Windows Print Spooler CVE-2016-3238 Remote Code Execution Vulnerability
SecurityTracker: 1036277

scip Labs: https://www.scip.ch/en/?labs.20161215
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Entryinfo

Created: 07/13/2016 10:10 AM
Updated: 09/01/2022 05:03 PM
Changes: 07/13/2016 10:10 AM (76), 04/07/2017 01:36 PM (11), 09/01/2022 04:55 PM (5), 09/01/2022 05:03 PM (1)
Complete: 🔍
Cache ID: 44:3A5:40

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