otrs -- SQL injection

OTRS Security Advisory reports:

Missing security quoting for SQL statements allows agents and
customers to manipulate SQL queries. So it’s possible for
authenticated users to inject SQL queries
via string manipulation of statements.
A malicious user may be able to manipulate SQL queries to read
or modify records in the database. This way it could also be
possible to get access to more permissions (e. g. administrator
permissions).
To use this vulnerability the malicious user needs to have
a valid Agent- or Customer-session.