Google disclosed Windows zero-day (CVE-2020-17087) vulnerability

Google has disclosed details of a new zero-day privilege escalation flaw in the Microsoft Windows operating system that it says is being actively exploited in the wild.

The elevation of privileges (EoP) vulnerability, tracked as CVE-2020-17087, concerns a buffer overflow present since at least Windows 7 in the Windows Kernel Cryptography Driver (“cng.sys”) that can be exploited.

The Windows Kernel Cryptography Driver (cng.sys) exposes a \Device\CNG device to user-mode programs and supports a variety of IOCTLs with non-trivial input structures. It constitutes a locally accessible attack surface that can be exploited for privilege escalation (such as sandbox escape).

Jason Davies

UK based technology professional, with an interest in computer security and telecoms.

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