This vulnerability allows local attackers to disclose sensitive information 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 the cng.sys driver. The issue lies in a series of IOCTLs that return pointers to functions within the driver. An attacker can leverage this together with another vulnerability to achieve code execution under the context of SYSTEM.