/usr/lib/debian-installer/images/7.0/i386/text/version.info is in debian-installer-7.0-netboot-i386 20130613+deb7u3.b2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 | Debian version: 7 (wheezy)
Installer build: 20130613+deb7u3+b2
|