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NSE: http-phpself-xss - Finds PHP files with reflected cross site scripting vulns due to unsafe use of the variable $_SERVER[PHP_SELF]
From: Paulino Calderon <paulino () calderonpale com>
Date: Thu, 31 May 2012 01:19:56 -0500

Hi list,

Here is a script for detecting reflected XSS in PHP files that don't sanitize the variable $_SERVER["PHP_SELF"]:

Crawls a web server looking for PHP files that use the variable $_SERVER["PHP_SELF"] unsafely.

This script crawls the webserver to create a list of PHP files and then sends an attack vector/probe to identify PHP_SELF cross site scripting vulnerabilities. PHP_SELF XSS refers to reflected cross site scripting vulnerabilities caused by the lack of sanitation of the variable <code>$_SERVER["PHP_SELF"]</code> in PHP scripts. This variable is
commonly used in php scripts with forms and when the current URI is needed.

Examples of Cross Site Scripting vulnerabilities in the variable $_SERVER[PHP_SELF]:

The attack vector/probe used is: <code>/'"/><script>alert(1)</script></code>
-- @usage
-- nmap --script=http-phpself-xss -p80 <target>
-- nmap -sV --script http-self-xss <target>
-- @output
-- 80/tcp open  http    syn-ack
-- | http-phpself-xss:
-- |   Unsafe use of $_SERVER["PHP_SELF"] in PHP files
-- |     State: VULNERABLE (Exploitable)
-- |     Description:
-- | PHP files are not handling safely the variable $_SERVER["PHP_SELF"] causing Reflected Cross Site Scripting vulnerabilities.
-- |
-- |     Extra information:
-- |
-- |   Vulnerable files with proof of concept:
-- | http://calder0n.com/sillyapp/three.php/%27%22/%3E%3Cscript%3Ealert(1)%3C/script%3E -- | http://calder0n.com/sillyapp/secret/2.php/%27%22/%3E%3Cscript%3Ealert(1)%3C/script%3E -- | http://calder0n.com/sillyapp/1.php/%27%22/%3E%3Cscript%3Ealert(1)%3C/script%3E -- | http://calder0n.com/sillyapp/secret/1.php/%27%22/%3E%3Cscript%3Ealert(1)%3C/script%3E -- | Spidering limited to: maxdepth=3; maxpagecount=20; withinhost=calder0n.com
-- |     References:
-- |       https://www.owasp.org/index.php/Cross-site_Scripting_(XSS)
-- |_      http://php.net/manual/en/reserved.variables.server.php
-- @args http-phpself-xss.uri URI. Default: /
-- @args http-phpself-xss.timeout Spidering timeout. Default:10000

Paulino Calderón Pale
Website: http://calderonpale.com
Twitter: http://twitter.com/calderpwn

Attachment: http-phpself-xss.nse

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  • NSE: http-phpself-xss - Finds PHP files with reflected cross site scripting vulns due to unsafe use of the variable $_SERVER[PHP_SELF] Paulino Calderon (May 31)
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