The Courier Authentication Library is a generic authentication API that encapsulates the process of validating account passwords.
It has been discovered that some input (e.g. the username) passed to the library are not properly sanitised before being used in SQL queries.
A remote attacker could provide specially crafted input to the library, possibly resulting in the remote execution of arbitrary SQL commands. NOTE: Exploitation of this vulnerability requires that a MySQL database is used for authentication and that a Non-Latin character set is selected.
There is no known workaround at this time.
All Courier Authentication Library users should upgrade to the latest version:
# emerge --sync
# emerge --ask --oneshot --verbose ">=net-libs/courier-authlib-0.60.6"