The security update for proftpd-dfsg in DSA-1727-1 caused a regression
with the postgresql backend. This update corrects the flaw. Also it was
discovered that the oldstable distribution (etch) is not affected by the
security issues. For reference the original advisory follows.
Read the full story: DSA-1730 proftpd-dfsg – SQL injection vulnerabilites: http://www.debian.org/security/2009/dsa-1730