[Development] [Announce] Security advisory: Qt Network

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Hi,

A recent SSL issue affecting both OpenSSL and Schannel in Qt Network has been reported and has been assigned the CVE id CVE-2023-33410.

In some circumstances, system CA certificates list remains unexpectedly active for the authentication of SSL peers. In a case where clients are supposed to be authenticated by server side using a custom restricted CA certificate list, and if the server is vulnerable, this allows malicious clients to successfully pass the SSL authentication against the server, by being able to use a very wide range of unexpectedly valid SSL private keys and certificates to do so.

Solution: Apply the following patches or update to Qt 5.15.15, Qt 6.2.9 or Qt 6.5.2

Patches:
dev: https://codereview.qt-project.org/c/qt/qtbase/+/477560 and https://codereview.qt-project.org/c/qt/qtbase/+/480002
Qt 6.5: https://codereview.qt-project.org/c/qt/qtbase/+/479276 and https://codereview.qt-project.org/c/qt/qtbase/+/480474 or https://download.qt.io/official_releases/qt/6.5/CVE-2023-33410-qtbase-6.5.diff
Qt 6.2: https://download.qt.io/official_releases/qt/6.2/CVE-2023-33410-qtbase-6.2.diff
Qt 5.15: https://download.qt.io/official_releases/qt/5.15/CVE-2023-33410-qtbase-5.15.diff

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

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