NULL Pointer Dereferences should have died few years ago but they are still being found and used in malware attacks. This post explores the internal details of CVE-2019-1132, which was used by Buhtrap group to target victims in Eastern Europe.

Introduction

The vulnerability we are discussing in this post, NULL pointer dereference, resides in win32k.sys driver which leads to successful escalation of privileges (EoP) on Windows 7 and Windows Server 2008 OSes.

Microsoft addressed this vulnerability in July patch and the vulnerability was discussed previously by ESET in their blog as this vulnerability was used in targeted attacks in Eastern Europe.

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