Advisory Details

August 9th, 2016

Microsoft Windows win32k RGNOBJ Integer Overflow Privilege Escalation Vulnerability

ZDI-16-449
ZDI-CAN-3702

CVE ID CVE-2016-3309
CVSS SCORE 6.9, (AV:L/AC:M/Au:N/C:C/I:C/A:C)
AFFECTED VENDORS Microsoft
AFFECTED PRODUCTS Windows
VULNERABILITY DETAILS


This vulnerability allows local attackers to execute arbitrary code on vulnerable installations of Microsoft Windows. User interaction is required to exploit this vulnerability in that the target must visit a malicious page or open a malicious file.

The specific flaw exists within RGNOBJ objects. An integer overflow vulnerability occurs when an attacker combines rectangles with special coordinates. An attacker can leverage this vulnerability to escalate privileges and execute code under the context of SYSTEM.

VENDOR RESPONSE Microsoft has issued an update to correct this vulnerability. More details can be found at:
https://technet.microsoft.com/library/security/MS16-098
DISCLOSURE TIMELINE
  • 2016-04-27 - Vulnerability reported to vendor
  • 2016-08-09 - Coordinated public release of advisory
CREDIT bee13oy of CloverSec Labs
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