------------------------------------------------------------------------ Cross-Site Scripting in Count per Day WordPress Plugin ------------------------------------------------------------------------ Yorick Koster, July 2016 ------------------------------------------------------------------------ Abstract ------------------------------------------------------------------------ A Cross-Site Scripting vulnerability was found in the Count per Day WordPress Plugin. This issue allows an attacker to perform a wide variety of actions, such as stealing Administrators' session tokens, or performing arbitrary actions on their behalf. In order to exploit this issue, the attacker has to lure/force a logged on WordPress Administrator into opening a malicious website. ------------------------------------------------------------------------ OVE ID ------------------------------------------------------------------------ OVE-20160724-0024 ------------------------------------------------------------------------ Tested versions ------------------------------------------------------------------------ This issue was successfully tested on Count per Day [2] WordPress Plugin version 3.5.4. ------------------------------------------------------------------------ Fix ------------------------------------------------------------------------ This issue is resolved in Count per Day version 3.5.5 [3]. ------------------------------------------------------------------------ Introduction ------------------------------------------------------------------------ The Count per Day [2] WordPress Plugin shows reads and visitors per page, visitors today, yesterday, last week, last months and other statistics. A Cross-Site Scripting vulnerability was found in the Count per Day WordPress Plugin. This issue allows an attacker to perform a wide variety of actions, such as stealing Administrators' session tokens, or performing arbitrary actions on their behalf. ------------------------------------------------------------------------ Details ------------------------------------------------------------------------ This issue exists in the file counter-options.php and is caused due to the lack of output encoding on the limit POST parameter.

'; In order to exploit this issue, the attacker has to lure/force a logged on WordPress Administrator into opening a malicious website. ------------------------------------------------------------------------ Proof of concept ------------------------------------------------------------------------ [h3]References[/h3] [1] https://sumofpwn.nl/advisory/2016/cross_site_scripting_in_count_per_day_wordpress_plugin.html [2] https://wordpress.org/plugins/count-per-day/ [3] https://downloads.wordpress.org/plugin/count-per-day.3.5.5.zip