A vulnerability has been found and corrected in proftpd:

Heap-based buffer overflow in the sql_prepare_where function
(contrib/mod_sql.c) in ProFTPD before 1.3.3d, when mod_sql is enabled,
allows remote attackers to cause a denial of service (crash) and
possibly execute arbitrary code via a crafted username containing
substitution tags, which are not properly handled during construction
of an SQL query (CVE-2010-4652).

Packages for 2009.0 are provided as of the Extended Maintenance
Program. Please visit this link to learn more:
http://store.mandriva.com/product_info.php?cPath=149&products_id=490

The updated packages have been patched to correct this issue.