SB2016121325 - Win32k Elevation of Privilege Vulnerability
Published: December 13, 2016
Security Bulletin ID
SB2016121325
Severity
Medium
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Local access
Highest impact
Code execution
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 security vulnerability.
1) Privilege escalation (CVE-ID: CVE-2016-7255)
The vulnerability allows a local user to gain elevated privileges on the target system.
The weakness is due to improper handling of objects in memory by win32k.sys. By sending a specially crafted system call NtSetWindowLongPtr(), a local attacker can set index GWLP_ID to WS_CHILD value on a window handle with GWL_STYLE and execute arbitrary code with system privileges.
Successful explotation of the vulnerability results in privilege escalation.
Note: this vulnerability is being actively exploited in the wild.
Remediation
Install update from vendor's website.