xrdp -- unchecked access to font glyph info

xrdp team reports:

Access to the font glyphs in xrdp_painter.c is not bounds-checked.
Since some of this data is controllable by the user, this can result
in an out-of-bounds read within the xrdp executable. The vulnerability
allows an out-of-bounds read within a potentially privileged process.
On non-Debian platforms, xrdp tends to run as root. Potentially an
out-of-bounds write can follow the out-of-bounds read. There is no
denial-of-service impact, providing xrdp is running in forking mode. This
issue has been addressed in release 0.9.23.1. Users are advised to upgrade.
There are no known workarounds for this vulnerability.