Advisory ID: HTB23152
Product: b2evolution
Vendor: b2evolution Group
Vulnerable Versions: 4.1.6 and probably prior
Tested Version: 4.1.6
Vendor Notification: April 10, 2013
Vendor Fix: April 29, 2013
Public Disclosure: May 1, 2013
Vulnerability Type: SQL Injection [CWE-89]
CVE Reference: CVE-2013-2945
Risk Level: Medium
CVSSv2 Base Score: 5.1 (AV:N/AC:H/Au:N/C:P/I:P/A:P)
Solution Status: Fixed by Vendor
Discovered and Provided: High-Tech Bridge Security Research Lab
 
Advisory Details:
High-Tech Bridge Security Research Lab discovered SQL injection vulnerability in b2evolution, which can be exploited to alter SQL requests passed to the vulnerable application's database.

1) SQL Injection in b2evolution: CVE-2013-2945
The vulnerability exists due to insufficient validation of HTTP GET parameter "show_statuses" in "/blogs/admin.php" script. A remote authenticated administrator can execute arbitrary SQL commands in application's database.
Depending on database and system configuration, PoC code below will create a "/tmp/file.txt" file, containing MySQL version:

This vulnerability is also exploitable via CSRF vector, since the application is prone to Cross-Site Request Forgery (CSRF) attacks. In order to do so an attacker should trick a logged-in administrator to visit malicious web page with CSRF exploit.
Basic CSRF exploit:

Solution:
Upgrade to b2evolution 4.1.7

More Information:
http://b2evolution.net/news/2013/04/29/b2evolution-4-1-7-and-5-0-3

References:
[1] High-Tech Bridge Advisory HTB23152 - https://www.htbridge.com/advisory/HTB23152 - SQL Injection in b2evolution
[2] b2evolution - http://b2evolution.net/ - A powerful free blog/CMS engine you can install on your own website.
[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.