Multiple vulnerabilities in Win32.sys in Microsoft Windows

Published: 2017-05-09 | Updated: 2017-05-10
Severity Medium
Patch available YES
Number of vulnerabilities 3
CVE ID CVE-2017-0263
CVE-2017-0246
CVE-2017-0245
CWE ID CWE-20
CWE-200
Exploitation vector Local
Public exploit Vulnerability #1 is being exploited in the wild.
Public exploit code for vulnerability #3 is available.
Vulnerable software Windows Subscribe
Windows Server
Vendor Microsoft

Security Advisory

1) Elevation of privilege

Severity: Medium

CVSSv3: 8.9 [CVSS:3.0/AV:L/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H/E:H/RL:O/RC:C] [PCI]

CVE-ID: CVE-2017-0263

CWE-ID: CWE-20 - Improper Input Validation

Description

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

The vulnerability exists due to boundary error in Win32k.sys driver. A local user can escalate privileges on the system.

Successful exploitation of this vulnerability may result in complete compromise of vulnerable system.

Note: this vulnerability is being actively exploited.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

Windows: 7, 8.1, 10, RT 8.1

Windows Server: 2008, 2008 R2, 2012, 2012 R2, 2016

CPE External links

https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2017-0263

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?

Yes. This vulnerability is being exploited in the wild.

2) Elevation of privilege

Severity: Low

CVSSv3: 8.1 [CVSS:3.0/AV:L/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H/E:U/RL:O/RC:C] [PCI]

CVE-ID: CVE-2017-0246

CWE-ID: CWE-20 - Improper Input Validation

Description

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

The vulnerability exists due to boundary error in Win32k.sys driver. A local user can escalate privileges on the system.

Successful exploitation of this vulnerability may result in complete compromise of vulnerable system.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

Windows: 7, 8.1, 10, RT 8.1

Windows Server: 2008, 2008 R2, 2012, 2012 R2, 2016

CPE External links

https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2017-0246

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.

3) Information disclosure

Severity: Low

CVSSv3: 3 [CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N/E:P/RL:O/RC:C]

CVE-ID: CVE-2017-0245

CWE-ID: CWE-200 - Information Exposure

Description

The vulnerability allows a local attacker to obtain potentially sensitive information on the target system.

The weakness exists  when the win32k component improperly provides kernel information. A local use can gain access to potentially sensitive information.

Successful exploitation of the vulnerability results in information disclosure.

Mitigation

Install update from vendor's website.

Vulnerable software versions

Windows: 7

Windows Server: 2008, 2008 R2, 2012, 2012 R2

CPE External links

https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2017-0245

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. However, proof of concept for this vulnerability is available.