November 22, 2021—KB5007254 (OS Build 20348.380) Preview

November 22, 2021—KB5007254 OS Build 20348.380 Preview 11/9/2021 IMPORTANT Because of minimal operations during the holidays and the upcoming Western new year, there won’t be a preview release known as a “C” release for the month of December 2021. There will be a monthly security release known as...

Microsoft DirectWrite AFDKO - Multiple Bugs in OpenType Font Handling Related to the _post_ Table

Microsoft DirectWrite AFDKO - Multiple Bugs in OpenType Font Handling Related to the post Table -----===== Background =====----- AFDKO Adobe Font Development Kit for OpenType is a set of tools for examining, modifying and building fonts. The core part of this toolset is a font handling library...

Microsoft DirectWrite AFDKO - Heap-Based Out-of-Bounds ReadWrite in OpenType Font Handling Due to Empty ROS Strings

Microsoft DirectWrite AFDKO - Heap-Based Out-of-Bounds ReadWrite in OpenType Font Handling Due to Empty ROS Strings -----===== Background =====----- AFDKO Adobe Font Development Kit for OpenType is a set of tools for examining, modifying and building fonts. The core part of this toolset is a font...

Microsoft DirectWrite AFDKO - Stack Corruption in OpenType Font Handling While Processing CFF Blend DICT Operator

Microsoft DirectWrite AFDKO - Stack Corruption in OpenType Font Handling While Processing CFF Blend DICT Operator -----===== Background =====----- AFDKO Adobe Font Development Kit for OpenType is a set of tools for examining, modifying and building fonts. The core part of this toolset is a font...

Microsoft DirectWrite AFDKO - Stack-Based Buffer Overflow in do_set_weight_vector_cube for Large nAxes

Microsoft DirectWrite AFDKO - Stack-Based Buffer Overflow in dosetweightvectorcube for Large nAxes -----===== Background =====----- AFDKO Adobe Font Development Kit for OpenType is a set of tools for examining, modifying and building fonts. The core part of this toolset is a font handling library...

Microsoft DirectWrite AFDKO - Out-of-Bounds Read in OpenType Font Handling Due to Undefined FontName Index

Microsoft DirectWrite AFDKO - Out-of-Bounds Read in OpenType Font Handling Due to Undefined FontName Index -----===== Background =====----- AFDKO Adobe Font Development Kit for OpenType is a set of tools for examining, modifying and building fonts. The core part of this toolset is a font handling...

Microsoft DirectWrite AFDKO - Use of Uninitialized Memory While Freeing Resources in var_loadavar

Microsoft DirectWrite AFDKO - Use of Uninitialized Memory While Freeing Resources in varloadavar -----===== Background =====----- AFDKO Adobe Font Development Kit for OpenType is a set of tools for examining, modifying and building fonts. The core part of this toolset is a font handling library...

Microsoft DirectWrite / AFDKO - Heap-Based Buffer Overflow in OpenType Font Handling in readEncoding

-----===== Background =====----- AFDKO Adobe Font Development Kit for OpenType is a set of tools for examining, modifying and building fonts. The core part of this toolset is a font handling library written in C, which provides interfaces for reading and writing Type 1, OpenType, TrueType to some...

Microsoft DirectWrite / AFDKO - Stack Corruption in OpenType Font Handling Due to Incorrect Handling of blendArray

-----===== Background =====----- AFDKO Adobe Font Development Kit for OpenType is a set of tools for examining, modifying and building fonts. The core part of this toolset is a font handling library written in C, which provides interfaces for reading and writing Type 1, OpenType, TrueType to some...

Microsoft DirectWrite / AFDKO - Interpreter Stack Underflow in OpenType Font Handling Due to Missing CHKUFLOW

-----===== Background =====----- AFDKO Adobe Font Development Kit for OpenType is a set of tools for examining, modifying and building fonts. The core part of this toolset is a font handling library written in C, which provides interfaces for reading and writing Type 1, OpenType, TrueType to some...

Microsoft DirectWrite / AFDKO - Stack Corruption in OpenType Font Handling Due to Negative nAxes

-----===== Background =====----- AFDKO Adobe Font Development Kit for OpenType is a set of tools for examining, modifying and building fonts. The core part of this toolset is a font handling library written in C, which provides interfaces for reading and writing Type 1, OpenType, TrueType to some...