[Announce] Two Qt security advisorys: GDI Font Engine & WebP image format

[List for announcements regarding Qt releases and development]

An issue on Windows with the GDI font engine has been reported and has been assigned the CVE id CVE-2023-43114.

When corrupt font data is passed to the GDI font engine via QFontDatabase::addApplicationFont[FromData] then it can trigger a crash in the application.

Solution: As a workaround, validate that the font is safe to use beforehand. Or apply the following patch or update to Qt 5.15.16, Qt 6.2.10, Qt 6.5.3, Qt 6.6.0

Patches:

dev: https://codereview.qt-project.org/c/qt/qtbase/+/503026
6.5: https://download.qt.io/official_releases/qt/6.5/CVE-2023-43114-6.5.diff
6.2: https://download.qt.io/official_releases/qt/6.2/CVE-2023-43114-6.2.diff
5.15: https://download.qt.io/official_releases/qt/5.15/CVE-2023-43114-5.15.diff



An issue in the libwebp library has been recently reported and assigned the CVE id CVE-2023-4863.

When a malicious WebP image is passed to the library then it can cause a buffer overflow.

Solution: As a workaround, update the WebP library manually to 1.3.2 and rebuild the imageformat plugin. Alternatively, apply the corresponding patch or update to Qt 5.15.16, Qt 6.2.10, Qt 6.5.3, Qt 6.6.0

Patches:

dev: https://codereview.qt-project.org/c/qt/qtimageformats/+/504175
6.5: https://download.qt.io/official_releases/qt/6.5/CVE-2023-4863-6.5.diff
6.2: https://download.qt.io/official_releases/qt/6.2/CVE-2023-4863-6.2.diff
5.15: https://download.qt.io/official_releases/qt/5.15/CVE-2023-4863-5.15.diff

Kind regards,
Andy
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Andy Shaw
Director, Technical Customer Success 
The Qt Company