Two vulnerabilities in Windows Print Spooler service



Risk Medium
Patch available YES
Number of vulnerabilities 2
CVE-ID CVE-2016-3239
CVE-2016-3238
CWE-ID CWE-264
CWE-20
Exploitation vector Local network
Public exploit N/A
Vulnerable software
 Windows
Operating systems & Components / Operating system

Windows Server
Operating systems & Components / Operating system

Vendor Microsoft

Security Bulletin

This security bulletin contains information about 2 vulnerabilities.

The discovered vulnerabilities allow a remote attacker to compromise vulnerable system and a local attacker to elevate privileges.

1) Privilege escalation in Windows Print Spooler service

EUVDB-ID: #VU139

Risk: Low

CVSSv4.0: 6.1 [CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2016-3239

CWE-ID: CWE-264 - Permissions, Privileges, and Access Controls

Exploit availability: No

Description

The vulnerability allows a local user to elevate privileges on vulnerable system.

The vulnerability exists due to Windows Print Spooler service allows arbitrary writing to the file system to unprivileged users. A local user can overwrite arbitrary files on the system.

Successful exploitation of this vulnerability may allow a local user to execute arbitrary code on the target system with elevated privileges.

Mitigation

To resolve this vulnerability vendor recommends installing the following updates:

Windows Vista

Windows Vista Service Pack 2
Windows Vista x64 Edition Service Pack 2

Windows Server 2008

Windows Server 2008 for 32-bit Systems Service Pack 2
Windows Server 2008 for x64-based Systems Service Pack 2
Windows Server 2008 for Itanium-based Systems Service Pack 2

Windows 7

Windows 7 for 32-bit Systems Service Pack 1
Windows 7 for x64-based Systems Service Pack 1

Windows Server 2008 R2

Windows Server 2008 R2 for x64-based Systems Service Pack 1
Windows Server 2008 R2 for Itanium-based Systems Service Pack 1

Windows 8.1

Windows 8.1 for 32-bit Systems
Windows 8.1 for x64-based Systems

Windows Server 2012 and Windows Server 2012 R2

Windows Server 2012
Windows Server 2012 R2

Windows RT 8.1

Use Windows Update to obtain the patch.

Windows 10

Windows 10 for 32-bit Systems
Windows 10 for x64-based Systems
Windows 10 Version 1511 for 32-bit Systems
Windows 10 Version 1511 for x64-based Systems

Server Core installation option

Windows Server 2008 for 32-bit Systems Service Pack 2
Windows Server 2008 for x64-based Systems Service Pack 2
Windows Server 2008 R2 for x64-based Systems Service Pack 1
Windows Server 2012
Windows Server 2012 R2

Vulnerable software versions

Windows: Vista - 10

Windows Server: 2008 - 2012 R2

CPE2.3 External links

https://technet.microsoft.com/en-us/library/security/MS16-087


Q & A

Can this vulnerability be exploited remotely?

No. This vulnerability can be exploited locally. The attacker should have authentication credentials and successfully authenticate on the system.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.

2) Driver validation error in Windows Print Spooler service

EUVDB-ID: #VU138

Risk: Medium

CVSSv4.0: 5.9 [CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2016-3238

CWE-ID: CWE-20 - Improper input validation

Exploit availability: No

Description

A remote attacker with access to local network can execute arbitrary code on the target system.

Windows Print Spooler service fails to properly validate print drivers when installing a printer from the server. A remote attacker with access to local network can perform MitM (man-in-the-middle) attack against workstation or print server and install malicious driver onto vulnerable system

Successful exploitation of this vulnerability may allow a remote attacker to gain complete access to vulnerable system.

Mitigation

To resolve this vulnerability vendor recommends installing the following updates:

Windows Vista

Windows Vista Service Pack 2
Windows Vista x64 Edition Service Pack 2

Windows Server 2008

Windows Server 2008 for 32-bit Systems Service Pack 2
Windows Server 2008 for x64-based Systems Service Pack 2
Windows Server 2008 for Itanium-based Systems Service Pack 2

Windows 7

Windows 7 for 32-bit Systems Service Pack 1
Windows 7 for x64-based Systems Service Pack 1

Windows Server 2008 R2

Windows Server 2008 R2 for x64-based Systems Service Pack 1
Windows Server 2008 R2 for Itanium-based Systems Service Pack 1

Windows 8.1

Windows 8.1 for 32-bit Systems
Windows 8.1 for x64-based Systems

Windows Server 2012 and Windows Server 2012 R2

Windows Server 2012
Windows Server 2012 R2

Windows RT 8.1

Use Windows Update to obtain the patch.

Windows 10

Windows 10 for 32-bit Systems
Windows 10 for x64-based Systems
Windows 10 Version 1511 for 32-bit Systems
Windows 10 Version 1511 for x64-based Systems

Server Core installation option

Windows Server 2008 for 32-bit Systems Service Pack 2
Windows Server 2008 for x64-based Systems Service Pack 2
Windows Server 2008 R2 for x64-based Systems Service Pack 1
Windows Server 2012
Windows Server 2012 R2

Vulnerable software versions

Windows: Vista - 10

Windows Server: 2008 - 2012 R2

CPE2.3 External links

https://technet.microsoft.com/en-us/library/security/MS16-087


Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the local network (LAN).

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.



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