Zero-day vulnerability in Windows

Privilege escalation

The zero-day was being actively exploited by Russian hackers (APT28, Fancy Bear, Pawn Storm, Sednit, Tsar Team, and Sofacy).

Vulnerability details

Advisory: SB2016110101 - Privilege escalation in Windows 10

Vulnerable component: Windows

CVE-ID: CVE-2016-7255

CVSSv3 score: CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H/E:H/RL:U/RC:C

CWE-ID: CWE-119 - Improper Restriction of Operations within the Bounds of a Memory Buffer


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.

Public Exploits: