ArchLinux: 202010-12 Critical: lib32-libpng Buffer Overflow Vulnerability

Arch Linux Security Advisory ASA-202010-11
=========================================
Severity: High
Date    : 2020-10-20
CVE-ID  : CVE-2020-15999
Package : lib32-freetype2
Type    : arbitrary code execution
Remote  : Yes
Link    : https://security.archlinux.org/AVG-1255

Summary
======
The package lib32-freetype2 before version 2.10.4-1 is vulnerable to
arbitrary code execution.

Resolution
=========
Upgrade to 2.10.4-1.

# pacman -Syu "lib32-freetype2>=2.10.4-1"

The problem has been fixed upstream in version 2.10.4.

Workaround
=========
None.

Description
==========
A heap buffer overflow has been found in freetype2 before 2.10.4.
Malformed TTF files with PNG sbit glyphs can cause a heap buffer
overflow in Load_SBit_Png as libpng uses the original 32-bit values,
which are saved in png_struct. If the original width and/or height are
greater than 65535, the allocated buffer won't be able to fit the
bitmap.

Impact
=====
A remote user can serve malformed TTF files that can cause arbitrary
code execution on the affected host.

References
=========


https://security.archlinux.org/CVE-2020-15999