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Analyzing an Out-of-Bounds read in a TTF font file

17 Dec 2019 by Luc - Technical - OOB Read Overflow Reverse Engineering CVE Demo REVEN

In this post we will analyze some specific points from the proof of concept for CVE-2019-1244, that has been found by Mateusz @j00ru Jurczyk. This vulnerability is a user-mode out-of-bounds read in Microsoft DirectWrite function dwrite.dll!sfac_GetSbitBitmap while processing a TTF font file. Our starting point is a first recording of...