you may have noticed CVE-2015-0235 as Glibc (GHOST) security issue these days.
Debian Wheezy (and Squeeze LTS) as well as other Linux distributions have provided security upgrades already; but maybe in case you have to patch an old Debian Lenny distribution you might find it useful, that I’ve fixed and recompiled the latest official Debian Lenny glibc v2.7 with the latest CVE-2015-0235 patch provided for Debian Wheezy and Squeeze LTS.
You may grab the binaries here: https://4ufiles.flo.sh/glibc/debian-lenny/
In order to test the vulnerability you may use the ghost tool (source file GHOST.c included).
If you did upgrade the right glibc libaries the result should look like this:
[00:06:24] root@[…]: /usr/src/ghost> ./ghost
UPDATE: Binaries for a patched Debian Lenny glibc6 v2.7 on i386 and amd64 architecture are available now.